Created by
Created March 26, 2012
Last modified March 26, 2012
Tags 2n2907a   ccs   constant-current-source   diy   milliamp   pnp   tdcs   transistor  


Not provided.


Constant Current Source with PNP transistor (2N2907A). Current is adjustable between 0 and 4 mA via a potentiometer. The load in the schematic is R4.


Any suggestions for improvement welcome. Particularly how to add a voltage cut off before R4 so that the circuit breaks if voltage exceeds 4 V. Please also give the specific component model to do this.

by uk2012
March 26, 2012

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