This circuit was found in American documentation from the 1960s. The operational amplifier is from that time, but the configuration applies to modern equivalents.
Suggested by the General Electric Hobby Manual of 1965 this circuit measures voltages from 0 to...
) The circuit in the figure uses an old OC71 germanium transistor. Performance depends on...
We find this circuit in an American documentation from the 80's. The circuit has the coil given by the...