The Awakening Essays (2034 words) - The Awakening, Edna, Grand Isle

The Awakening Carey Coco July 23, 1999 Dr. Jackson English 2070 Kate Chopin and Edna Pontellier as Feminists Kate Chopin is known for her literary works that depict culture in New Orleans, Louisiana, and of womens struggles for freedom. She was born Katherine OFlaherty in Missouri, and later married Oscar Chopin in 1870. He was a Creole cotton trader from New Orleans. Later they moved to a plantation near Cloutierville, Louisiana, where her husband died in 1882. She returned to Missouri with her six children, and began her writing career. She began writing mostly local color stories that earned her consideration as a contributor to Southern regional literature. She later began writing stories about womens need for independence and capacity for passion, such as The Story of an Hour and the well known The Awakening. Her stories of women developing sensuality and individuality attracted a storm of negative criticism. Her career was severely damaged by this and she only managed to publish three more stories, and they were not well received. (Seyersted, 15-19) At the end of the nineteenth century, American thoughts and beliefs were undergoing many changes. It was a period in which Americans were unsure about their feelings concerning the industrialization, urbanization, and changing social standards that were taking place. The first women's right convention was held in July of 1848, in New York. This was the beginning of the modern feminist movement. The women leaders pushed on until 1870, when the 15th Amendment allowed women the right to vote. (Seyersted, 45) This was also the year that Kate was married to Oscar Chopin. Noticing this we can realize how aware Chopin must have been of these changes, and how she used them to feel confident in allowing her novels to grow more liberal. This time of change also caused the awful reaction of The Awakening that Kate Chopin probably did not expect. Although the women in America were advancing, those in state of Louisiana were not. At the time the state operated under a different legal system than the rest of the country. Under the Louisiana Civil Code, article 1388, a woman was still the legal property of her husband, and the male had absolute (legal) control over the family. It also said, in article 1124, married women, babies, and the mentally ill were incompetent in making a legal contract. (Herman, 53) Wives were possessions to be cared for and displayed. They often brought a dowry or inherited wealth to a marriage. Like most of Chopins stories, The Awaking is set in the late 19th-century Creole society of the New Orleans area. It is the story of a young womans struggle to become herself. It concludes that the complete freedom and happiness that she yearns for is not available to her in socially appointed roles as a wife and mother. Edna Pontellier is married to her husband, Mr.Pontellier, a person whom she had married without love as an excuse (McQuade, 1661). The story opens during summer vacation at Grand Isle. This environment allows Edna to explore her own personality. It is on the island that Edna begins her awakening to life. She first realizes her dissatisfaction with her life. Then she learns the pleasure of swimming. It is on Grand Isle that she begins to feel sexual attraction to Robert, although her awakening to sexuality occurs months later. Edna also realizes that she is not a mother-woman this summer. She does love her two sons, but admits to Madame Ratignolle that she would never sacrifice herself for her children, or for anyone (McQuade, 1683). She distinguishes her person independent to the Edna that is a mother and wife. Although her husband, Leonce, would visit the island, Edna spent most of her time bonding with Robert Lebrun. She fell in love with him without even knowing it. Edna was able to be herself that summer. Not having to play all the roles her husband had provided her. Edna also bonded with two other women, Adele Ratignolle and Mademoiselle Reisz. She studied each of the womans life roles. Adele was clearly a mother-woman to her children and her husband. To Edna, Adele looks like a faultless Madonna. An Edna can see that Adele has chosen the roles that

Cloning Regulation essays

Cloning Regulation essays Throughout the United States and much of the world the legal issues surrounding cloning have been hard pressed since the birth of Dolly in 1997. Dolly was created using a method called somatic cell nuclear transfer and not long after Dollys birth it was suggested that the same method be used to clone human beings. That is when the governments all around the world started paying much more attention to the concerns of cloning. Shortly after the birth of Dolly then President Clinton purposed a moratorium on any amount of federal funds for the research of human cloning because of the uncertainties that related to cloning. Clinton said that he would take appropriate actions after the National Bioethics Advisory Commission (NBAC) concluded their thorough investigation of the societal effects that human cloning may have. Clinton believed that any discovery the touches upon the human creation is not simply a matter of scientific inquiry [but also]... a matter of morality and spirituality. In august of 1997, Clinton purposed a bill that would ban any cloned cells being placed in the womb of a female for five years, giving the NBAC adequate time to research and make a recommendation to congress on the medical, ethical, and legal aspects of human cloning. The NBAC research concluded the following: There are many psychological harms associated with the possibility of a diminished sense of individuality and personal autonomy. Human cloning could degrade the quality of parenting and family life. Because life could be replicated so easily, human cloning could create the potential for the people to be viewed as objects instead of as ends to themselves. Supporters of cloning are concerned that a ban would impinge on the personal choice, freedom of scientific inquiry and the potential for new biomedical breakthroughs. ...

Equal Rigths Amendment Essay Example | Topics and Well Written Essays - 2000 words

Equal Rigths Amendment - Essay Example Gender based discrimination could also be observed in other social aspects. It was also seen screaming on the political front where women weren’t allowed to cast a vote and participate in the formulation of a democratic government. In the mid-nineteenth century, feminists(Gill)were the first to start the movement for the abolition of inequality from society. In this regard first planned meeting was arranged by the Women’s Rights Convention under the supervision of Elizabeth Candy Stanton and Lucretia Mott in Seneca Falls(Neale). This meeting was 2 days long and approximately 300 men and women participated.During the course of discussions, Alice Paul introduced the Equal Rights Amendment as(Francis): â€Å"If we keep on this way they will be celebrating the 150th anniversary of the 1848 convention without being much further advanced in equal rights than we are†¦. If we had not concentrated on the Federal Amendment we should be working today for suffrage†¦. We shall not be safe until the principle of equal rights is written into the framework of our government.† The purpose of this meeting was to raise a voice against injustice suffered by women in the male oriented society, which mercilessly made them a victim of ridicule and disrespect. Congress was later informed about the meeting and a request was put forward that asked for the ratification of equal rights for both men and women, and inclusion of this clause in the constitution. This effort received strong opposition from men, as well as a few women, who were against the notion of women standing at equal footing with men. In fourteenth amendment of the constitution, congress appalled all the workers of feminist movement by paying heed to their endless requests and introducing the equality clause in the constitution. According to the amendment, all the citizens of U.S have the equal rights. The word â€Å"male† was introduced for the first time in the constitution while ta lking about the electorate rights that still granted the voting ability to only the men of the country. Susan did not accept the exemption of women from the right to vote and therefore went to cast vote in presidential elections. As a result of this act, she was fine, arrested and convicted with this apparent crime. When this case was taken to the Supreme Court, it was decided that although women were very much citizens of the country, it was not necessary for every citizen to have the right to vote. Fourteenth amendment could not suppress this effort and the campaign for human rights continued for many years thereafter. Stanton, Susan, and Sojourner also fought to abolish slavery and demanded equal rights for the slaves. Stanton and Frederick made many impassioned speeches, urging the authorities to grant females the right to cast a vote in their country. This resulted in the Amendment of suffrage which was introduced in the constitution and supported women’s right to vote. Just after three years of the ratification of suffrage amendment, National Women’s Party forwarded an equal rights amendment to the Congress, which was ratified for years in every part of the country since 1923. This document has passed through different phases and was amended a number of times and finally got placed in the national constitution in much modified form. It was incorporated officially into the

Framework for proposal Essay Example | Topics and Well Written Essays - 250 words

Framework for proposal - Essay Example For these reasons, my proposal will include both technical and prose formats. 2. In section 1, I will organize my ideas into paragraphs written in a logical manner in order to guide and direct the reader. The ideas will be basically to provide background information, identify goals and objectives of the project. 3. In section 2 which will be written in prose, I will structure the proposal through the use of heading and subheadings which will be presented in such away that there will be a logical flow of ideas. Examples will be provided to enhance clarity and understanding. Markers may also be used to emphasize ideas, words, and phrases. The idea is to demonstrate why the expansion of the psychology department is needed. 4. The two common formats I will use in the TW sections include the use of concrete, direct, and specific language as well as the use of charts, graphs, tables, and lists in order to convey specific information. The use of concrete, direct, and specific language is to show preciseness and conciseness in presentation of specific technical information. The use of the charts, graphs, tables, and lists is important to show visual presentation of specific information. 5. In section 2 of the proposal, it will be important to use present information about the limited capacity of the psychology department. Data that might be presented include the limited number of available facilities, instructors, administrators, and students. After presenting these data, I will show why the department needs to be expanded. In section 4, I might provide data about how expansion of the psychology department in other universities has benefited these universities. I might even present opinions from students, administrators, and instructors supporting the expansion. 7. In the prose parts of the proposal, I will use standard English, figurative language, and even slang while in

Capitalism Essay Example | Topics and Well Written Essays - 500 words - 3

Capitalism - Essay Example The present day Dubai is capitalist and this is because the profit motive controls all undertakings and the royal family enjoys most of the profits acquired from the production of various commodities. For example, the Dubai royal family controls most of the oil reserves in the country and they fund other sectors of the economy in order to gain from different areas and build up wealth. In my work environment, which is the court, capitalism exists and an example of this is that there are minorities who control the legal structures and they can get away with crimes through unethical practices. There are various aspects of welfare state in the UAE and these include the government providing free education and access to funds for development purposes. The country also engages in helping its neighbors all in the effort of providing benefits to people all over the world. The UAE was not capitalist 100 years ago, and this can be explained by the fact that people could help each other to survive and even at times for free. People traded with various items such as fish, and this was not for the profit motive, but to work together in order to survive. However, this has now changed and everything is done with the motive of earning a profit. I believe that despite capitalism being just in that one gets what they work for, it is evil and people should help each other to survive and not be greedy in order to accrue wealth as others suffer from poverty. Everyone has a right to survive and exploiting others to amass more wealth as others suffer in poverty is

Amplitude modulation

Amplitude modulation Amplitude modulation Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent. For example, changes in the signal strength can be used to reflect the sounds to be reproduced by a speaker, or to specify the light intensity of television pixels. (Contrast this with frequency modulation, also commonly used for sound transmissions, in which the frequency is varied; and phase modulation, often used in remote controls, in which the phase is varied) In the mid-1870s, a form of amplitude modulation—initially called undulatory currents—was the first method to successfully produce quality audio over telephone lines. Beginning with Reginald Fessendens audio demonstrations in 1906, it was also the original method used for audio radio transmissions, and remains in use today by many forms of communication—AM is often used to refer to the mediumwave broadcast band (see AM radio). Forms of amplitude modulation As originally developed for the electric telephone, amplitude modulation was used to add audio information to the low-powered direct current flowing from a telephone transmitter to a receiver. As a simplified explanation, at the transmitting end, a telephone microphone was used to vary the strength of the transmitted current, according to the frequency and loudness of the sounds received. Then, at the receiving end of the telephone line, the transmitted electrical current affected an electromagnet, which strengthened and weakened in response to the strength of the current. In turn, the electromagnet produced vibrations in the receiver diaphragm, thus closely reproducing the frequency and loudness of the sounds originally heard at the transmitter. In contrast to the telephone, in radio communication what is modulated is a continuous wave radio signal (carrier wave) produced by a radio transmitter. In its basic form, amplitude modulation produces a signal with power concentrated at the carrier frequency and in two adjacent sidebands. This process is known as heterodyning. Each sideband is equal in bandwidth to that of the modulating signal and is a mirror image of the other. Amplitude modulation that results in two sidebands and a carrier is often called double sideband amplitude modulation (DSB-AM). Amplitude modulation is inefficient in terms of power usage and much of it is wasted. At least two-thirds of the power is concentrated in the carrier signal, which carries no useful information (beyond the fact that a signal is present); the remaining power is split between two identical sidebands, though only one of these is needed since they contain identical information. To increase transmitter efficiency, the carrier can be removed (suppressed) from the AM signal. This produces a reduced-carrier transmission or double-sideband suppressed-carrier (DSBSC) signal. A suppressed-carrier amplitude modulation scheme is three times more power-efficient than traditional DSB-AM. If the carrier is only partially suppressed, a double-sideband reduced-carrier (DSBRC) signal results. DSBSC and DSBRC signals need their carrier to be regenerated (by a beat frequency oscillator, for instance) to be demodulated using conventional techniques. Even greater efficiency is achieved—at the expense of increased transmitter and receiver complexity—by completely suppressing both the carrier and one of the sidebands. This is single-sideband modulation, widely used in amateur radio due to its efficient use of both power and bandwidth. A simple form of AM often used for digital communications is on-off keying, a type of amplitude-shift keying by which binary data is represented as the presence or absence of a carrier wave. This is commonly used at radio frequencies to transmit Morse code, referred to as continuous wave (CW) operation. In 1982, the International Telecommunication Union (ITU) designated the various types of amplitude modulation as follows: Designation Description A3E double-sideband full-carrier the basic AM modulation scheme R3E single-sideband reduced-carrier H3E single-sideband full-carrier J3E single-sideband suppressed-carrier B8E independent-sideband emission C3F vestigial-sideband Lincompex linked compressor and expander Example: double-sideband AM A carrier wave is modeled as a simple sine wave, such as: c(t) = Ccdot sin(omega_c t + phi_c),, where the radio frequency (in Hz) is given by: omega_c / (2pi)., For generality, C,and phi_c,are arbitrary constants that represent the carrier amplitude and initial phase. For simplicity, we set their respective values to 1 and 0. Let m(t) represent an arbitrary waveform that is the message to be transmitted. And let the constant M represent its largest magnitude. For instance: m(t) = Mcdot cos(omega_m t + phi)., Thus, the message might be just a simple audio tone of frequency omega_m / (2pi)., It is generally assumed that omega_m ll omega_c, and that min[ m(t) ] = -M., Then amplitude modulation is created by forming the product: y(t), = [A + m(t)]cdot c(t),, = [A + Mcdot cos(omega_m t + phi)]cdot sin(omega_c t). A,represents another constant we may choose. The values A=1, and M=0.5, produce a y(t) depicted by the graph labelled 50% Modulation in 4. For this simple example, y(t) can be trigonometrically manipulated into the following equivalent form: y(t) = Acdot sin(omega_c t) + begin{matrix}frac{M}{2} end{matrix} left[sin((omega_c + omega_m) t + phi) + sin((omega_c omega_m) t phi)right]., Therefore, the modulated signal has three components, a carrier wave and two sinusoidal waves (known as sidebands) whose frequencies are slightly above and below omega_c., Also notice that the choice A=0 eliminates the carrier component, but leaves the sidebands. That is the DSBSC transmission mode. To generate double-sideband full carrier (A3E), we must choose: A ge M., For more general forms of m(t), trigonometry is not sufficient. But if the top trace of 2 depicts the frequency spectrum, of m(t), then the bottom trace depicts the modulated carrier. It has two groups of components: one at positive frequencies (centered on + ωc) and one at negative frequencies (centered on − ωc). Each group contains the two sidebands and a narrow component in between that represents the energy at the carrier frequency. We need only be concerned with the positive frequencies. The negative ones are a mathematical artifact that contains no additional information. Therefore, we see that an AM signals spectrum consists basically of its original (2-sided) spectrum shifted up to the carrier frequency. For those interested in the mathematics of 2, it is a result of computing the Fourier transform of: [A + m(t)]cdot sin(omega_c t),,using the following transform pairs: begin{align} m(t) quad stackrel{mathcal{F}}{Longleftrightarrow}quad M(omega) \ sin(omega_c t) quad stackrel{mathcal{F}}{Longleftrightarrow}quad i pi cdot [delta(omega +omega_c)-delta(omega-omega_c)] \ Acdot sin(omega_c t) quad stackrel{mathcal{F}}{Longleftrightarrow}quad i pi A cdot [delta(omega +omega_c)-delta(omega-omega_c)] \ m(t)cdot sin(omega_c t) quad stackrel{mathcal{F}}{Longleftrightarrow} frac{1}{2pi}cdot {M(omega)} * {i pi cdot [delta(omega +omega_c)-delta(omega-omega_c)]} \ = frac{i}{2}cdot [M(omega +omega_c) M(omega -omega_c)] end{align} In terms of the positive frequencies, the transmission bandwidth of AM is twice the signals original (baseband) bandwidth—since both the positive and negative sidebands are shifted up to the carrier frequency. Thus, double-sideband AM (DSB-AM) is spectrally inefficient, meaning that fewer radio stations can be accommodated in a given broadcast band. The various suppression methods in Forms of AM can be readily understood in terms of the diagram in 2. With the carrier suppressed there would be no energy at the center of a group. And with a sideband suppressed, the group would have the same bandwidth as the positive frequencies of M(omega)., The transmitter power efficiency of DSB-AM is relatively poor (about 33%). The benefit of this system is that receivers are cheaper to produce. The forms of AM with suppressed carriers are found to be 100% power efficient, since no power is wasted on the carrier signal which conveys no information. Modulation index As with other modulation indices, in AM, this quantity, also called modulation depth, indicates by how much the modulated variable varies around its original level. For AM, it relates to the variations in the carrier amplitude and is defined as: h = frac{mathrm{peak value of } m(t)}{A} = frac{M}{A}, where M,and A,were introduced above. So if h = 0.5, the carrier amplitude varies by 50% above and below its unmodulated level, and for h = 1.0 it varies by 100%. To avoid distortion in the A3E transmission mode, modulation depth greater than 100% must be avoided. Practical transmitter systems will usually incorporate some kind of limiter circuit, such as a VOGAD, to ensure this. Variations of modulated signal with percentage modulation are shown below. In each image, the maximum amplitude is higher than in the previous image. Note that the scale changes from one image to the next. Amplitude modulator designs This section does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (October 2008) This article only describes one highly specialized aspect of its associated subject. Please help improve this article by adding more general information. (October 2009) Circuits A wide range of different circuits have been used for AM, but one of the simplest circuits uses anode or collector modulation applied via a transformer. While it is perfectly possible to create good designs using solid-state electronics, valved (vacuum tube) circuits are shown here. In general, valves are able to more easily yield RF powers, in excess of what can be easily achieved using solid-state transistors. Most high-power broadcast stations still use valves. Anode modulation using a transformer. The tetrode is supplied with an anode supply (and screen grid supply) which is modulated via the transformer. The resistor R1 sets the grid bias; both the input and outputs are tuned LC circuits which are tapped into by inductive coupling Modulation circuit designs can be broadly divided into low and high level. Low level Here a small audio stage is used to modulate a low power stage; the output of this stage is then amplified using a linear RF amplifier. Advantages The advantage of using a linear RF amplifier is that the smaller early stages can be modulated, which only requires a small audio amplifier to drive the modulator. Disadvantages The great disadvantage of this system is that the amplifier chain is less efficient, because it has to be linear to preserve the modulation. Hence Class C amplifiers cannot be employed. An approach which marries the advantages of low-level modulation with the efficiency of a Class C power amplifier chain is to arrange a feedback system to compensate for the substantial distortion of the AM envelope. A simple detector at the transmitter output (which can be little more than a loosely coupled diode) recovers the audio signal, and this is used as negative feedback to the audio modulator stage. The overall chain then acts as a linear amplifier as far as the actual modulation is concerned, though the RF amplifier itself still retains the Class C efficiency. This approach is widely used in practical medium power transmitters, such as AM radiotelephones. High level With high level modulation, the modulation takes place at the final amplifier stage where the carrier signal is at its maximum Advantages One advantage of using class C amplifiers in a broadcast AM transmitter is that only the final stage needs to be modulated, and that all the earlier stages can be driven at a constant level. These class C stages will be able to generate the drive for the final stage for a smaller DC power input. However, in many designs in order to obtain better quality AM the penultimate RF stages will need to be subject to modulation as well as the final stage. Disadvantages A large audio amplifier will be needed for the modulation stage, at least equal to the power of the transmitter output itself. Traditionally the modulation is applied using an audio transformer, and this can be bulky. Direct coupling from the audio amplifier is also possible (known as a cascode arrangement), though this usually requires quite a high DC supply voltage (say 30 V or more), which is not suitable for mobile units. See also * AM radio * Mediumwave band used for AM broadcast radio * Longwave band used for AM broadcast radio * Frequency modulation * Shortwave radio almost universally uses AM, narrow FM occurring above 25MHz. * Modulation, for a list of other modulation techniques * Amplitude modulation signalling system (AMSS), a digital system for adding low bitrate information to an AM signal. * Sideband, for some explanation of what this is. * Types of radio emissions, for the emission types designated by the ITU * Airband * Quadrature amplitude modulation References * Newkirk, David and Karlquist, Rick (2004). Mixers, modulators and demodulators. In D. G. Reed (ed.), The ARRL Handbook for Radio Communications (81st ed.), pp.15.1-15.36. Newington: ARRL. ISBN 0-87259-196-4. Pulse-amplitude modulation From Wikipedia, the free encyclopedia Principle of PAM; (1) original Signal, (2) PAM-Signal, (a) Amplitude of Signal, (b) Time Overview Pulse-amplitude modulation, acronym PAM, is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. Example: A two bit modulator (PAM-4) will take two bits at a time and will map the signal amplitude to one of four possible levels, for example −3 volts, −1 volt, 1 volt, and 3 volts. Demodulation is performed by detecting the amplitude level of the carrier at every symbol period. Pulse-amplitude modulation is widely used in baseband transmission of digital data, with non-baseband applications having been largely superseded by pulse-code modulation, and, more recently, by pulse-position modulation. In particular, all telephone modems faster than 300 bit/s use quadrature amplitude modulation (QAM). (QAM uses a two-dimensional constellation). Usage of Pulse-amplitude modulation in Ethernet It should be noted, however, that some versions of the widely popular Ethernet communication standard are a good example of PAM usage. In particular, the Fast Ethernet 100BASE-T2 medium, running at 100Mb/s, utilizes 5 level PAM modulation (PAM-5) running at 25 megapulses/sec over two wire pairs. A special technique is used to reduce inter-symbol interference between the unshielded pairs. Later, the gigabit Ethernet 1000BASE-T medium raised the bar to use 4 pairs of wire running each at 125 megapulses/sec to achieve 1000Mb/s data rates, still utilizing PAM-5 for each pair. The IEEE 802.3an standard defines the wire-level modulation for 10GBASE-T as a Tomlinson-Harashima Precoded (THP) version of pulse-amplitude modulation with 16 discrete levels (PAM-16), encoded in a two-dimensional checkerboard pattern known as DSQ128. Several proposals were considered for wire-level modulation, including PAM with 12 discrete levels (PAM-12), 10 levels (PAM-10), or 8 levels (PAM-8), both with and without Tomlinson-Harashima Precoding (THP). amplitude modulation DEFINITION- Also see modulation. Amplitude modulation (AM) is a method of impressing data onto an alternating-current (AC) carrier waveform.The highest frequency of the modulating data is normally less than 10 percent of the carrier frequency.The instantanous amplitude (overall signal power) varies depending on the instantaneous amplitude of the modulating data. In AM, the carrier itself does not fluctuate in amplitude.Instead, the modulating data appears in the form of signal components at frequencies slightly higher and lower than that of the carrier.These components are called sidebands. The lower sideband (LSB) appears at frequencies below the carrier frequency; the upper sideband (USB) appears at frequencies above the carrier frequency.The LSB and USB are essentially mirror images of each other in a graph of signal amplitude versus frequency, as shown in the illustration.The sideband power accounts for the variations in the overall amplitude of the signal. When a carrier is amplitude-modulated with a pure sine wave, up to 1/3 (33 percent) of the overall signal power is contained in the sidebands.The other 2/3 of the signal power is contained in the carrier, which does not contribute to the transfer of data.With a complex modulating signal such as voice, video, or music, the sidebands generally contain 20 to 25 percent of the overall signal power; thus the carrier consumes 75 to 80 percent of the power.This makes AM an inefficient mode.If an attempt is made to increase the modulating data input amplitude beyond these limits, the signal will become distorted, and will occupy a much greater bandwidth than it should.This is called overmodulation, and can result in interference to signals on nearby frequencies. Analog modulation methods A low-frequency message signal (top) may be carried by an AM or FM radio wave. Common analog modulation techniques are: * Amplitude modulation (AM) (here the amplitude of the carrier signal is varied in accordance to the instantaneous amplitude of the modulating signal) o Double-sideband modulation (DSB) Â § Double-sideband modulation with unsuppressed carrier (DSB-WC) (used on the AM radio broadcasting band) Â § Double-sideband suppressed-carrier transmission (DSB-SC) Â § Double-sideband reduced carrier transmission (DSB-RC) o Single-sideband modulation (SSB, or SSB-AM), Â § SSB with carrier (SSB-WC) Â § SSB suppressed carrier modulation (SSB-SC) o Vestigial sideband modulation (VSB, or VSB-AM) o Quadrature amplitude modulation (QAM) * Angle modulation o Frequency modulation (FM) (here the frequency of the carrier signal is varied in accordance to the instantaneous frequency of the modulating signal) o Phase modulation (PM) (here the phase shift of the carrier signal is varied in accordance to the instantaneous phase shift of the modulating signal) AMPLITUDE MODULATION How it works. We know that something as simple as a crystal diode (rectifier) can be used to capture sound from the air and put it into a pair of earphones or an amplifier and speaker. How can this work? We will cover that here and now. All AM (Amplitude Modulation) detectors work basically the same way. What is AM? What we can hear as audio is classically considered to be the frequency range between 20 and 20,000 cycles per second (here after referred to as cycles and abandoning hertz) which I have never liked). In reality most adults can only hear up to about 13,000 cycles. Most speakers cant reproduce anything lower than 30 cycles in spite of the exaggerated claims of proud owners. So lets be generous and call audio 30 to 15,000 cycles. Radio frequencies are between 8,000 cycles and 50,000 megacycles. Thats right there is a range of frequencies that depending on how they are treated can be audio or radio. The AM radio band begins at 540 kilocycles. For simplicity lets say that we want to transmit a 10,000 cycle tone on a radio transmitter operating on 250 kilocycles. The 250 kc transmitting frequency is called the carrier wave because it may be thought of as carrying the audio. The 10,000 cycle audio frequency is called the modulating frequency. We may get into side-bands later. In the above the upper wave is the modulating wave and three cycles of it can be seen. The lower wave is the modulated carrier wave and 75 cycles are visible. (You can count them for yourself or take my word for it.) Notice as the modulating wave goes up the total amplitude of the carrier wave (measured from negative peak to positive peak) goes up. As the modulating wave goes down the amplitude of the carrier wave goes down. When the modulating wave is at zero (the point where it begins and ends) the carrier wave is at its middle or unmodulated value. Think of the modulating wave as controlling a valve that the carrier wave is passing through. (I have direct conformation from England, thats why the British call tubes valves.) The carrier wave can then be sent to an antenna which radiates it out for all the world to hear. Detecting the signal Detection is the word applied to the process of recovering the audio frequencies from the radio frequency carrier. In the case of amplitude modulation it is very simple. All we need to do is to rectify the signal. Rectification is the process used in power supplies to change AC to DC. Its really quite similar for detecting radio signals. Compare the carrier wave in the below with the one in the above. The wave has been run through a rectifier which removed the bottom half of every cycle. If we draw a line connecting the peaks we have the original modulating signal back again. Connecting the peaks is done by using a capacitor to charge up to the peak value and discharge through a resistor just fast enough to follow the modulating frequency but not so fast as to cause a large variation at the carrier frequency. The frequencies chosen for this drawing are fairly close together to make it possible to see the individual cycles on your computer screen. When dealing with the AM broadcast band the carrier frequencies range from 540 kc to 1600 kc. 10,000 cycles is the absolute upper limit for audio on AM and most transmitters only make it to about 8,000 cycles. Look back at the diagram of the crystal set. Use your back button to return here. If you are familiar with power supply circuits you will recognize it as a half wave rectifier with a capacitor to filter out ripple. The resistor makes the capacitor discharge just fast enough but not too fast. A much more rigorous discussion of AM, including side bands, is available by clicking here. This includes not only AM but SSB and FM. AMPLITUDE MODULATION Amplitude modulation or AM as it is often called, is a form of modulation used for radio transmissions for broadcasting and two way radio communication applications. Although one of the earliest used forms of modulation it is still in widespread use today. The first amplitude modulated signal was transmitted in 1901 by a Canadian engineer named Reginald Fessenden. He took a continuous spark transmission and placed a carbon microphone in the antenna lead. The sound waves impacting on the microphone varied its resistance and in turn this varied the intensity of the transmission. Although very crude, signals were audible over a distance of a few hundred metres, although there was a rasping sound caused by the spark. With the introduction of continuous sine wave signals, transmissions improved significantly, and AM soon became the standard for voice transmissions. Nowadays, amplitude modulation, AM is used for audio broadcasting on the long medium and short wave bands, and for two way radio communication at VHF for aircraft. However as there now are more efficient and convenient methods of modulating a signal, its use is declining, although it will still be very many years before it is no longer used. What is amplitude modulation? In order that a radio signal can carry audio or other information for broadcasting or for two way radio communication, it must be modulated or changed in some way. Although there are a number of ways in which a radio signal may be modulated, one of the easiest, and one of the first methods to be used was to change its amplitude in line with variations of the sound. The basic concept surrounding what is amplitude modulation, AM, is quite straightforward. The amplitude of the signal is changed in line with the instantaneous intensity of the sound. In this way the radio frequency signal has a representation of the sound wave superimposed in it. In view of the way the basic signal carries the sound or modulation, the radio frequency signal is often termed the carrier. What is amplitude modulation, AM Amplitude Modulation, AM When a carrier is modulated in any way, further signals are created that carry the actual modulation information. It is found that when a carrier is amplitude modulated, further signals are generated above and below the main carrier. To see how this happens, take the example of a carrier on a frequency of 1 MHz which is modulated by a steady tone of 1 kHz. The process of modulating a carrier is exactly the same as mixing two signals together, and as a result both sum and difference frequencies are produced. Therefore when a tone of 1 kHz is mixed with a carrier of 1 MHz, a sum frequency is produced at 1 MHz + 1 kHz, and a difference frequency is produced at 1 MHz 1 kHz, i.e. 1 kHz above and below the carrier. If the steady state tones are replaced with audio like that encountered with speech of music, these comprise many different frequencies and an audio spectrum with frequencies over a band of frequencies is seen. When modulated onto the carrier, these spectra are seen above and below the carrier. It can be seen that if the top frequency that is modulated onto the carrier is 6 kHz, then the top spectra will extend to 6 kHz above and below the signal. In other words the bandwidth occupied by the AM signal is twice the maximum frequency of the signal that is used to modulated the carrier, i.e. it is twice the bandwidth of the audio signal to be carried. Amplitude demodulation Amplitude modulation, AM, is one of the most straightforward ways of modulating a radio signal or carrier. The process of demodulation, where the audio signal is removed from the radio carrier in the receiver is also quite simple as well. The easiest method of achieving amplitude demodulation is to use a simple diode detector. This consists of just a handful of components:- a diode, resistor and a capacitor. AM diode detector AM Diode Detector In this circuit, the diode rectifies the signal, allowing only half of the alternating waveform through. The capacitor is used to store the charge and provide a smoothed output from the detector, and also to remove any unwanted radio frequency components. The resistor is used to enable the capacitor to discharge. If it were not there and no other load was present, then the charge on the capacitor would not leak away, and the circuit would reach a peak and remain there. Advantages of Amplitude Modulation, AM There are several advantages of amplitude modulation, and some of these reasons have meant that it is still in widespread use today: * It is simple to implement * it can be demodulated using a circuit consisting of very few components * AM receivers are very cheap as no specialised components are needed. Disadvantages of amplitude modulation Amplitude modulation is a very basic form of modulation, and although its simplicity is one of its major advantages, other more sophisticated systems provide a number of advantages. Accordingly it is worth looking at some of the disadvantages of amplitude modulation. * It is not efficient in terms of its power usage * It is not efficient in terms of its use of bandwidth, requiring a bandwidth equal to twice that of the highest audio frequency * It is prone to high levels of noise because most noise is amplitude based and obviously AM detectors are sensitive to it. Summary AM has advantages of simplicity, but it is not the most efficient mode to use, both in terms of the amount of space or spectrum it takes up, and the way in which it uses the power that is transmitted. This is the reason why it is not widely used these days both for broadcasting and for two way radio communication. Even the long, medium and short wave broadcasts will ultimately change because of the fact that amplitude modulation, AM, is subject to much higher levels of noise than are other modes. For the moment, its simplicity, and its wide usage, mean that it will be difficult to change quickly, and it will be in use for many years to come

Whaling: One of the Big Issues in the World

Whaling Whaling is the hunting of whales and it is one of the big issues in the world. Japan is one of the pro-whaling countries and a majority of the Western countries are objecting to Japan. However, this essay would like to insist that whaling is a part of the Japanese rural traditional culture, so it is important for some Japanese people. Therefore, the essay support the idea that whale hunting should not be prohibited.This essay aims to tell people who do not know about Japanese whaling well that the true Japanese attitude toward whaling is very different from what they imagine, and o clear up an opponent's misunderstanding of it. What are the motivations for whaling in Japan? What are the social implications of whaling in Japan? I will answer to these questions. First of all, the biggest reason why a lot of countries oppose whaling is that whales are endangered species. However, the truth is Japan is hunting adequate numbers concerning the numbers of whales to prevent them from becoming extinct.In the world, it is said, â€Å"there are 84 species of whales† and â€Å"out of all of the 84 species, only a limited number traditionally have been hunted, such as blue whales, fin whales, inke whales, humpback whales, sperm whales and gray whales† Oapan Whaling Association). According to Gardiner, â€Å"When whales were over-hunted, species such as blue whales and right whales were reduced to very low population levels, but these species now have been fully protected for decades â€Å"(21). Then, Japan is not hunting these species and strongly believes that they should continue to be protected.On the other hand, there are species which are abundant enough that marine management is needed, † such as the Antarctic and northwestern Pacific minke hales and northwestern Pacific Bryde's whales† Oapan Whaling Association). Gardiner also said that â€Å"there are three times as many minke whales as there were 30 years ago, and humpbacks are increasing by 17 percent a year† (21). Actually, for example, â€Å"Antarctic minke whales are hunted 850 out of 442,000 by Japan, and this amount is only 0. 2% of 442,000† Oapan Whaling Association).Thus, thanks to the advanced use of computers, we can obtain precise and clear data of the numbers of whales, so IWC, The International Whaling Commission, is the global ntergovernmental body charged with the conservation of whales and the management of whaling, can determine appropriate numbers of whales to catch quotas on a stock by stock basis. Therefore, Japanese whaling will not harm the health of the whale populations. No whales have ever been hunted to extinction, nor will they be. Then why is Japan still hunting whales in spite of being opposed by many countries?It is because hunting whales and eating their meat is the Japanese traditional culture. Japanese people have been living with whales from prehistoric age until now. During this long history, whaling culture such as songs, dances, and traditional crafts have begun through whaling. On the other side of the coin, Japanese people have received benefits from whaling. In fact, there is a faith in whales which is for holding a memorial service for whales by way of warning because Japanese people know that taking their lives is a really serious matter.Peace said that â€Å"the Japanese do not attach the same significance to the whale as Westerners do because of the way it is culturally categorized† (7). Then, â€Å"the whale falls into the ategory of fish rather than mammal: the character for Whale' has two parts, the first being the sign for a fish† (Peace 7). Therefore, it also shows clearly that there is a big cultural difference between Japan and Westerners, and it is very difficult to bridge the gap.Morishita also argued that â€Å"Japan, with limited grazing land and adherence to Buddhist teachings that prohibited eating of land mammals, has long resorted to the oceans to supply its animal protein. This is why we consider our food culture a ‘seafood culture' in contrast to the European and US' cattle culture'. † We recognize hat there are diverse food cultures in the world, and some people only accept eating of pigs and cattle while others regard eating animals as normal, so eating whales is almost the same for Japanese too.Whale dietary culture has begun from â€Å"around 1952, whale meat was officially included in school lunch-boxes nationwide, staying there for a couple of decades† according to Blok (56). Consequently, older generations in Japanese society widely share memories of eating the meat of whales during childhood. It is said that â€Å"Japanese dietary habits have changed drastically, with beef, ork and chicken, taking over and whale-meat all but disappearing, then whale-mean has become a highly â€Å"select† food, usually enjoyed at special occasions or at specific whale cuisine restaurants† (Blok 56).Th us, whale-meat eating became more special, traditional, and valuable action for Japanese, so this tradition should be passed down the generations. Some people might say that Japan is the only country, which is hunting whales, but it is wrong. Actually, Norway, Iceland, and Alaska are hunting whales too though, â€Å"Japan seems to take the blame for all the whaling in the world† (Gardiner 21). He also continued to say â€Å"Greenland, the Faroe Islands and Canada take twice as many whales as Japan.Yet the Japanese are seen as taking more than everyone† (Gardiner 21). It means that maybe the argument of whaling is almost the one-way conversation and other countries ignore a Japanese insistence. Gardiner also said â€Å"many articles written on whaling in major Western magazines seem to have an anti-Japanese bias and such media have manipulated various governments over the years into believing that the majority of New Zealanders oppose whaling† (22). Therefore, un fortunately this makes people get the wrong mpression of Japanese whaling.For preventing this, the media must report opinions of the both sides about whaling and have to stick with a neutral position, so that people also can understand there is a big cultural difference. Whaling is very controversial issue in the world and it is very difficult to say whether that action is right or wrong, because, needless to say, there is a difference in values between the pro-whaling and the anti-whaling communities. However, this essay aimed to dispel the misconception about Japanese values toward whaling and understand their point of view.Then the research supports the idea that whaling should not be banned, because some species of whales are not endangered and furthermore, Japan knows very well about how many whales they can hunt without threatening them with extinction and the country also protects endangered species. In addition, eating whale-meat connects to the Japanese tradition and Japan considers whales as fish compared to Western countries as mammals. Therefore, the essay would like some people to know that these truths and not be manipulated by the biased media. Japanese whaling nas social implications, such as culture, tood, and employment.Some people live because the Job of whaling, so if it is banned, they would lose their jobs and some young people have to leave their town, because they would not be able to get a Job. Therefore, whaling is important for Japan so should not be banned. Furthermore, it is important to educate the Western world about this topic, because there are many values in this world, so people must not to be biased when they think about a world issue. Then discussing and exchanging views of the both sides with each other not by attacking mentally and physically would also create cross-cultural nderstanding.

A brief comparison between characters Essay

In the start we see that the two children of Mr and Mrs Birling(Sheila and Eric), support their parents in the beginning. Their character was exactly mirrored their parents view. Gerald however, is remains the same and refuses to change his character and is the same as Mr and Mrs Birling. This is not so obvious in the beginning, but if u study the book really carefully, you would see that there are many quotes that suggest that Gerald Croft was always in support of Mr. Birling, such as â€Å"Yes, exactly so† and so on. Mr Birling also goes on to tell Gerald and Eric â€Å"how a man should know how to look after himself†. This shows Mr Birling lack of civic mindedness and how emphasises on how selfish he is. There are also other instances on how selfish he is. For example, when he only cares for his knighthood and his reputation when news gets round of his family causing Eva to commit suicide. There is also no doubt that he is a unfeeling man when he shows no regret and remorse when he sacked Eva. Rather, he feels that he was not responsible for Eva Smith’s death. Mrs. Birling had almost a 100 percent mirror of Mr. Birling except that she flexes her muscles as head of the charity organization to refuse help to Eva Smith. She felt that it was impertinent of Eva to call herself Mrs Birling. Furthermore, she was a liar (as her children soon found out) as she had refused to acknowledge the photo of Eva and was adamant about not having met her. However after repeated questioning, she admitted that Eva had came to her for help before. She is also in the dark about Eric’s drinking habit and realizes that Sheila is not as pure as Mrs. Birling thought she was (â€Å"ran away with only a torn blouse†¦Ã¢â‚¬  â€Å"Shelia!†). This goes to show that Mrs Birling does not understand her children well enough to reveal their characters. Sheila had been thought to be a simple-minded girl and who was always excited. However after tonight, she became a changed person. She became the opposite of her parents and her views contradict the views of her parents. She felt that she was solely responsible that Eva had committed suicide. However, she knew the â€Å"importance† of civic mindedness when she discovers  that all of the Birlings and Gerald had each played a part to help in killing her. Sheila is also perceptive when she says that the inspector â€Å"he’s giving us the rope – so that we’ll hang ourselves†. This shows that she thinks deeply and with consideration. In this way, she becomes wiser at the end of the play and views things from a different angle. Gerald is seen as a dynamic character, who switches his â€Å"face† again and again so that we view different angles of him. In the start, he agrees with everything Mr. Birling about civic mindedness and all that nonsense. Our impression of him at the start is a man who has a lack of civic mindedness and indifference. However, we see a change in his character when he comes clean on having a relationship with Eva. But there is just one flaw, when the Inspector leaves and he comes back, he tells them that there was no such Inspector. When it was confirmed with a phone call to the Colonel Roberts, he breathes a heavy sigh of relief. Does this show that he was hypocritical and only wanted to get off the hook? For Eric, we can see that he contradicts with whatever his father says. Even at the end, he argues with his father daringly. It is not sure whether he had argued with on the basis of spiting him or to really show his true feelings on how his father had treated Eva. He also shows remorse when he says â€Å"we did her in all right†. He also stands strong on Sheila’s side on how it did not matter whether the Inspector was a fraud. What was important was that they had all did something wrong even if the girls were different.

Free Essays on Diocletians Reforms

Diocletian’s Reforms The Roman empire regained order and stability through its powerful emperor Diocletian. He made a set of reforms to stabilize the empire. He knew that if he did not do so, the empire would eventually fall. One of the first notable things Diocletian decided to do to stabilize the empire was to establish a capital. He said,†Wherever I am, that’s where the capital is.† The capital was in no specific place. However he did spend most of his time fighting for his empire against the Germans along the Northern border. The next set of reforms involved the military. First, he took each legion and divided them in half. This created double the amount of legions, but they were significantly smaller. When he drafted soldiers to fight, he did not draft a certain number of men but rather a number of legions. He never increased the men per legion. This then led to the military becoming more mobile. Since the Roman army moved too slow, Diocletian wanted to mount them on horses. This created a light calvary and enabled them to move on and off the battlefield more of a swift fashion. His next set of reforms included the establishment of the Oriental Monarchy. This meant that their was a psychological distance between him and his subjects. This created a huge bureaucracy and his subjects had to wait weeks just to see him. He overwhelmed his subjects by wearing a huge gold crown and cape that took nearly 12 men to carry behind him. He then set up economic reforms. These played a huge part in Diocletian’s attempt to reconstruct the empire. He invented a coinage system and put a value to each coin. It is similar to the system we have today. ( for quarters equal one dollar. So on and so forth.) However, some problems developed from his economic system. Their were not enough metals to go around, which made it impossible to create more coins, and eventually led to gold being worth much more ... Free Essays on Diocletians Reforms Free Essays on Diocletians Reforms Diocletian’s Reforms The Roman empire regained order and stability through its powerful emperor Diocletian. He made a set of reforms to stabilize the empire. He knew that if he did not do so, the empire would eventually fall. One of the first notable things Diocletian decided to do to stabilize the empire was to establish a capital. He said,†Wherever I am, that’s where the capital is.† The capital was in no specific place. However he did spend most of his time fighting for his empire against the Germans along the Northern border. The next set of reforms involved the military. First, he took each legion and divided them in half. This created double the amount of legions, but they were significantly smaller. When he drafted soldiers to fight, he did not draft a certain number of men but rather a number of legions. He never increased the men per legion. This then led to the military becoming more mobile. Since the Roman army moved too slow, Diocletian wanted to mount them on horses. This created a light calvary and enabled them to move on and off the battlefield more of a swift fashion. His next set of reforms included the establishment of the Oriental Monarchy. This meant that their was a psychological distance between him and his subjects. This created a huge bureaucracy and his subjects had to wait weeks just to see him. He overwhelmed his subjects by wearing a huge gold crown and cape that took nearly 12 men to carry behind him. He then set up economic reforms. These played a huge part in Diocletian’s attempt to reconstruct the empire. He invented a coinage system and put a value to each coin. It is similar to the system we have today. ( for quarters equal one dollar. So on and so forth.) However, some problems developed from his economic system. Their were not enough metals to go around, which made it impossible to create more coins, and eventually led to gold being worth much more ...

Why Do I Deserve To In This Scholarship

Why Do I Deserve To In This Scholarship Why Do I Deserve To In This Scholarship I am 51 year old, disabled for eight years and divorced. I grew up with a father who was a preacher. I have a low but fixed income. I have faced various challenges since the time that I was in school. I lost my sister in august 2009 then I was also hospitalized the day that my sister died after suffering from two blood clots one in each lung, in guarded condition; more to that, I lost a friend who was a mentor two years ago. Despite all these challenges, I have maintained a 3.7 grade average. In my first semester, in KaplanUniversity, I attained an average grade of 4.0 still being able to attain 3.7-grade average. For now, I have one semester left before I attain an associate of applied science in computer information network administration. I have a plan to remain in school after I graduate so that I can attain a degree in criminal justice computer crimes. I need to take a major in criminal justice and a minor in information technology. I also have a desire to continue with my education after this so that I can attain a Masters degree. I would also apply for an internship in the criminal justice field so that I can obtain at least a part time job after completing my internship. I have had great achievements. I appeared in the president list during the first semester, and I have appeared in the deans list every semester. I have also managed to maintain a grade point average. I have also written a manual on how computer works and hope to publish the manual. I have a passion in helping the unfortunate members of the society. I usually rebuild computers and donate them to people who are trying to better their lives by going back to school. I am also a volunteer in my grandsons school. I spend three times a week helping with class work and in field trips. I have learnt to overcome obstacles since the time I became disabled. I have grown from being a depressed person who had no hopes and dreams of having a good life. Now I know that am able to overcome anything that comes on my way towards getting my degree. Despite that fact that I do not have money I have great faith that I will find a way to make it. Since I understand that, Ability is what you're capable of doing. Motivation determines what you do. Attitude determines how well you do it. It is with this passion that I make the application to offered scholarship so that I can realize my dream.

Public budgeting Article Example | Topics and Well Written Essays - 500 words - 1

Public budgeting - Article Example The article starts by laying down the statistics from the Federal Reserve displaying the high number of Americans, and the all-time $975 billion dollars in the year 2008. The projections as of the time was that debt would keep on increasing since people kept reaching for the credit cards debts in order to make ends meet. According to the statistics from the Sachs & Williamson (2009), many consumers have more than five credit cards, with an average total of about five each per family. The psychological look at the consumers by the researchers termed the consumers as having a low debt recovery modality owing to the many debts they find themselves wading. As such, they stray from what they term as normative debt management principles (Amar, et al., 2011). Consumers go forward and start paying individual debts while not looking at the value of each and every debt and prioritizing them. The total redemption from indebtedness is difficult, something that sometimes prompt consumer’s adoption of sub-goals that are normally aimed at settling the individual debts. They sometimes settle the small debts and remain with the huger ones. The oblivion borne by the consumers to the larger debts and misplaced focus by them is what takes a huge toll in the paper as the author analyses the things to do when one is indebted (Heckler, 2013). To the authors, paying of the small debts and remaining with the bigger ones might help relieve the burden but the amount to pay keeps sk y-rocketing as one dilly-dallies. The article is well arranged as the authors move from the obvious to the completely hard stuff concerning debt management. The authors lay down the statistics, the trend in debt management, then finally give their opinion of what should really be happening in the real world concerning the issue of contention. Authors term paying off of debts with larger

Karaoke machine circuit based in transistors+ graphic equalizer Essay

Karaoke machine circuit based in transistors+ graphic equalizer - Essay Example The circuit will include following essential elements 1. Two inputs, 1 for microphone and a second for Line input, which could be mixed and boosted with a common emitter amplifier stage. 2. A six-band graphic equalizers stage. 3. A common emitter voltage boost amplifier stage. 4. A common collector power amplifier. 5. Circuit works from mains power supply. Circuit Operation Detailed circuit operation is given as under:- Power Supply The power supply is connected to pre amplifier and power amplifier blocks. The Transformer T1 is a simple step-down transformer which takes 240 V Ac current and gives out 9.5 V Ac at current rating of 1.3 amps approximately. The circuit requires steady DC current therefore output of transformer is applied to rectifiers. Transformer works on the principle of mutual induction of two coils. When current in the primary coil is changed, the flux linked to the secondary coil also changes. Consequently, an EMF is induced in the secondary coil. The transformer T1 consists of a rectangular core of soft iron in the form of sheets insulated from one another. Two separate coils of insulated wires, a primary coil and a secondary coil are wound on the core. These coils are well insulated from one another and from the core. The coil on the input side is called Primary coil and the coil on the output side is called Secondary coil. According to Faradays law EMF induced in a coil depends upon the rate of change of magnetic flux in the coil. If resistance of the coil is small then the induced EMF will be equal to voltage applied. A transformer in which Number of turns in primary coil are greater than Number of turns in secondary coil (Np>Ns) is called a step down transformer which is T1 in this case. In this way the Step down transformer T1 converts high alternate voltage of 240V to low alternate voltage of 9.5 V with current rating of 1.3 amps approximately. This voltage is next passed on to a rectifier to obtain a steady DC voltage. Rectifier D1 con sists of four diodes which are meant to convert Ac into DC. During each half of current cycle the diodes block reverse current and allow forward current. Rectifier D1 is a full wave rectifier which works during both positive and negative cycle of AC. Rectification is the conversion of alternating current (AC) to direct current (DC). This involves a device that only allows one-way flow of electrons and it is built around a four-diode bridge configuration therefore called a full-wave bridge or rectifier .Regardless of the polarity of the input, the current flows in the same direction through the load. That is, the negative half-cycle of source is a positive half-cycle at the load. The current flow is through two diodes in series for both polarities. Rectifier bridge works half time during positive sinosidal wave and half time during negative sinosidal wave. The result is a steady DC current measuring 9.5 V. This current is applied to Capacitor C18 with value 2500 uf, which charges the in put to around 13.5-14V peak voltage. This voltage is passed to a standard 12 V regulator IC1 that gives steady DC output of 12 V to run the complete circuit. In the power supply, heat is dissipated during transformer and voltage regulation stages. The capability of a capacitor to store electricity is known as capacitance of that capacitor. It is denoted by C. The measuring unit of capacitance is Farad, but Farad is very large unit. Its smaller units are Kilo Micro Farad (KMFD), Micro