Transistor as switch

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Transistor as a switch


A transistor is used in the following circuit. The load resistor R4 has a value of 22 kOhm. The output voltage of the operational amplifier is 4V when switched on.

  1. What is the function of stage 2 in this circuit?
  2. Calculate the value of resistor R3. The overdrive factor ODF should be 2.5.

Extract from the data sheet of the transistor BC 546 used here:
hfe 150 | VCEsat = 0.25 V | VBE = 0.7 V


Transistor as an electronic switch - Exercise

Transistor as an electronic switch - Exercise

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