Voltage to Current Converter 2

The current out is Iout =Vin/R. For negative currents, a PNP can be used and, for better accuracy, a Darlington pair can be substituted for the transistor. With careful design, this circuit can be used to control currents of many amps. Unity gain compensation is necessary.

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Voltage to Current Converter 2 - Circuitos de Electronica