The source, based on a Type
TL084 quadruple opamp,
is intended to convert an input
signal of 0-5 V into a current
of G-20 mA. This type of circuit
is used, for instance, to transfer
measurands (quantities being
measured) over long leads. Since
the resistance of the leads is
part of the current loop, it is of
no consequence and can not affect
the measurement.
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