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Variable current source 100ma-2amp

2017-08-24 11:45  
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The output current is set by the resistor R in the collector of Tr2, which may be varied to offer a range of output currents from 100 mA to 2 A with fine control by means of VR3 which varies the reference voltage to the non-inverting input of the op amp.
Variable current source 100ma-2amp

The feedback path from the output to the inverting input of the op amp maintains a constant voltage across R, equal to (VCC-VIN) and hence a constant current to the load given



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