This circuit makes use of a 741 single source operational amplifier to measure resistors on a linear scale. The circuit may use as an indicator a common multimeter on a low current range.
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Constant currents from 10 mA to 1 A can supply the load, depending on the selection made by S1. Q1...
The optocoupler in the figure uses common transistors and a phototransistor to drive a sensitive relay...