Investigating the I-V characteristic of a diode
In the corporeal world of electronics, the current in a component is lots calculated from the
voltage drop across a immunity in series with it. This is because it is usually not possible to
wee out open a circuit to insert the ammeter!
1.
Set up the circuit as shown, with 4700 ? for R. Use a 1N4148 signal diode.
2.
mensuration the forward voltage Vf of the diode. Calculate the forward current If using
Ohms virtue applied to the resistor. (You should tick about 0.7 V and just low 1 mA.)
3.
Repeat steps 1 and 2 with the quest values of R.
2200 ?
4.
1000 ?
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.
Assemble the circuit shown below. Be careful to get the capacitor attached round the
right way.
2.
Press C and release it; then press D. There should be a brief flash of light from the
LED. Explain why.
3.
Insert a second 1000 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 end shows a variable transformer (a.c. power pack)
give current to a 1 k? resistor. 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 want to get a full essay, order it on our website: Orderessay
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