This circuit can be used in measurement bridges. We found it in the September 1995 Electronics Now magazine. The meter can be from 50 uA to 1 mA and the power supply is simple.
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
The voltage reference integrated circuit used in this 1980s unit is hard to find today. The power...
Found in a 1967 Electronics World, this circuit uses unusual components today. The transformer has a high...