Regulated Power Supply Coursework Example | Topics and Well Written Essays - 3000 words

Regulated Power Supply - Coursework Example So what is a power supply? In the days before complicated ICs and complicated digital electronics, a simple power supply was composed of a transformer and a rectifier circuit. The transformer is where alternating current or AC voltage enters. AC voltage comes from the normal voltage from the electrical outlet at home. It carries with it alternating current and has to be transformed and rectified into direct current (DC) so that it can power up the electrical appliance. It has an input and an output. The output is the desired DC voltage for an electronic circuit which depends whether it is 6 volts or 12 volts or even higher. Since it is the heart and that it supplies the main lifeblood of an electronic system, it is easy to locate, and if one has become acquainted with it, easy to troubleshoot and repair. That is easy said than done, but in any electronic troubleshooting mastery of the block- and schematic diagrams and every detail of the circuitry will ensure a troubleshooting succes s. For electronic technicians and engineers, pinpointing the location of the power supply is as easy as troubleshooting itself. 1.1 Definition of terms 1.1.1 Transformer – A transformer is a devised used to transform voltages or current; the transformation is from higher voltage to smaller voltage (step-down transformer), or from smaller voltage to higher voltage (step-up voltage). Most electronic circuits in appliances and gadgets use step-down transformers. For example, if the power supply in our home is 220 volts or 110 volts, we are going to use a step down-transformer to transformer the higher voltage and current to 6 volts, 9 volts, or 12 volts, as the case maybe. 1.1.2 Alternating Current/Direct current (AC/DC) – The current that enters a transformer is known as alternating current (AC). This is a static current which do not respond to the needed direct current of an electronic circuit. Therefore, the AC current has to be transformed into a DC or direct current. The AC voltage/current comes from the utilities company that supplies our electrical needs at home. First, we have to compare the different types of current and be able to name the parts in it. As mentioned, there are two types of current – the alternating current and the direct current. The alternating current is not regulated – the sine waves are alternating, and this has to be rectified using a diode or diodes, with a capacitor and other filtering components, so that the circuit can produce an output of a DC current. After we have transformed the AC to DC, then we still have to regulate it to match the needed voltage and current that a particular electronic circuit needs. In our high-tech world nowadays, designs have eliminated the transformer and other analog circuits; instead, integrated (IC) circuits have replaced many of the components. 1.1.3 Rectifier Circuit A rectifier is a diode or a circuitry of diodes that transforms alternating current into direct curren t. In a simple rectifier circuit, a diode is coupled with a filter capacitor and load resister to complete the rectification process. This produces a half-wave and does not completely provide full rectification. 1.1.4 Regulator A regulator can be a transistor or an integrated circuit (IC). The purpose of a regulator is to provide a steady DC output. A well-regulated DC is needed in circuits to produce the needed output or purpose of that

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You have to analyse our calculations that i will upload - Case Study Example In choosing the securities that are to be included in the portfolio, the risk involved should be considered. Risk is usually measured by the use of beta. Beta is used as an indicator of how sensitive a stock is, towards market forces. A security that has a bet greater than 1 is said to be risky while a security that has a beta less than one is less risky. Risky securities are often associated with high returns. In the choice of the securities, the companies should not be correlated. That will ensure that the risk involved in the portfolio is minimal. Our group has considered six companies. The companies include Adidas, Wal-Mart, Samsung, syngenta, Google and Lufthansa. The companies are from different industries and that will help in reducing the risk that is associated with the portfolio. A good portfolio should have securities that are not correlated (Levinson, 2006, 155). That will help in ensuring that a failure in one industry will not lead to a failure in the other. The first step in the evaluation in considering the securities is finding the average rate of return. The average rate of return can be calculated by using the geometric or arithmetic mean. The rate of return was as follows, From the analysis of the rate of return, Google has the best rate of return while Wal-Mart is associated with the lowest rate of return. That means that if two investors invest the same amount of money in the two different companies, the investor at Google will earn more in terms of return. However, in making an investment decision, the risk factor has to be considered. Below is a table showing the risk associated with the securities. From the analysis on risk involved in all the securities, Wal-Mart turns out to be the less risky security. Such analysis of risks and return will enable an investor to come up with the appropriate stock portfolio that will be well balanced. After analyzing the return that will accrue from individual securities, an analysis should be done