Power Supplies

Electronics Explained: powerfulness Supplies Investigating the I-V characteristic of a diode In the corporeal world of electronics, the received in a fragment is lots calculated from the voltage drop across a immunity in series with it. This is because it is usually not feasible to wee out open a circuit to get in the ammeter! 1. Set up the circuit as shown, with 4700 ? for R. Use a 1N4148 signal diode. 2. mensuration the onward voltage Vf of the diode. Calculate the forward current If using Ohms virtue applied to the resistor. (You should tick slightly 0.7 V and just low 1 mA.) 3. Repeat travel 1 and 2 with the quest values of R. 2200 ? 4. blow0 ? 470 ? 220 ? 100 ? Use your results to plot a currentvoltage interpret for the diode. Use axes similar to the ones shown below. www.electronicsexplained.co.uk ? Michael W. Brimicombe 2000 Electronics Explained: Power Supplies Charging and discharging a capacitor 1. fix the circuit shown below. Be careful to get the capacitor link round the right way. 2. Press C and release it; therefore press D. There should be a brief photoflash of light from the LED. Explain why. 3. Insert a second super acid µF capacitor in check with the one already there. Investigate what difference this makes. 4. Now place the capacitors in series with each other. What happens? www.electronicsexplained.co.uk ? Michael W. Brimicombe 2000 Electronics Explained: Power Supplies Different types of rectifier 1. The circuit at the left wing end shows a variable transformer (a.c. power pack) give current to a 1 k? resistor. An oscilloscope (CRO) is connected to the return terminal. Notice that one terminal of the transformer has been earthed. Construct the circuit. 2. Set up the CRO so that its vertical amplifier is 2 V/cm and the timebase is 5 ms/cm. Adjust the Y-shift so that the trace is in the centre of the screen f or 0 V. Dont adjust these settings from now! on. You...If you inadequacy to get a full essay, order it on our website: OrderEssay.net

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