Power Supplies

Electronics Explained: powerfulness Supplies Investigating the I-V characteristic of a diode In the corporeal world of electronics, the flow in a particle is lots calculated from the voltage drop across a immunity in series with it. This is because it is usually not workable to wee out open a circuit to enfold the ammeter! 1. Set up the circuit as shown, with 4700 ? for R. Use a 1N4148 signal diode. 2. mensuration the in advance voltage Vf of the diode. Calculate the forward current If using Ohms virtue applied to the resistor. (You should tick most 0.7 V and just low 1 mA.) 3. Repeat stairs 1 and 2 with the quest values of R. 2200 ? 4. ampere-second0 ? 470 ? 220 ? 100 ? Use your results to plot a currentvoltage graph 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. piece the circuit shown below. Be careful to get the capacitor given over round the right way. 2. Press C and release it; thence press D. There should be a brief wink of light from the LED. Explain why. 3. Insert a second cat valium 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-hand(prenominal) end shows a variable transformer (a.c. power pack) give current to a 1 k? resisto! r. An oscilloscope (CRO) is connected to the output 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 for 0 V. Dont adjust these settings from now on. You...If you indigence to get a full essay, order it on our website: BestEssayCheap.com

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