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f-alpha.net » Electronics » Semiconductor Devices » Diode » Let's go... » Experiment 6 - Leakage Current

Experiment 6 - The Leakage Current (Reverse Current)

Look at the circuit shown. You recognize the diode which is connected in the reverse direction. Behind it a Darlington pair is attached to amplify any weak current passing the diode.

Darlington pair with a diode in reverse direction. (Enlarge)

Circuit diagram Darlington pair with a diode in reverse direction.

In fact, the LED lights up weakly!

Through the diode, a current of only a very few μA flows. This current is called leakage current or reverse current.

I-V characteristics of an ideal diode with leakage current.

           

In next step you you look closely at the reverse area.

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