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f-alpha.net » Electronics » Basic Circuits » Transistor Basic Circuits » Let's go... » Experiment 7 - Common Collector Circuit II

Experiment 7 - Current gain of a Common Collector Circuit

Use the circuit shown.

Measuring current in a common collector circuit. (Enlarge)

Circuit diagram current measurement in a common collector circuit.

Turn the potentiometer P1, until a current of approx. Iin = 0.010 mA flows into the base. At the same time you measure at the output a typical value of approx. Iout = 2.50 mA.

Turn P1 a little further until a current of approx. Iin = 0.015 mA flows into the base. Now you measure a typical value of approx. Iout = 3.50 mA at the output.

A change of only 0.005 mA into the base results in a rise of 1.00 mA at the output. This corresponds to a gain hhe = 200.

The gain hhe can vary greatly in your experiments. Important however is the finding...

                           

The current gain of a common collector circuit is high.

 
   

And what about the voltage gain...?

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