Transistor Checker Circuit

  
The circuit is built around a 741 general-purpose op amp that is configured as a voltage follower; with the components shown, the op amp has a voltage gain of one. The output of the 741 is used to drive a 50- meter movement. Potentiometer R7 is used to zero the meter and R6 sets the meter`s full-scale reading, Calibrating the meter is a snap. With no input applied to the circuit, set R6 to mid-position and adjust R7 to zero the meter. Once that is done, apply a positive 1-Vdc voltage to the input and adjust R6 for a full-scale reading.
Transistor Checker Circuit - schematic

The voltmeter can be adjusted to read both positive and negative voltages by adjusting R7 for a center scale reading at the meter`s zero position and a positive 1- V reading at the meter`s full-scale position.




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