This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency should be chosen for maximum efficiency according to the small transformer used.
This circuit for voltmeter has an output of 1 V for 100 uA having been suggested by American...
The operational amplifier used is a double 741. The power supply is symmetrical, and the gain is...
We found these circuits in a 90s Radio Electronics. In them, we have the way to turn a load on and...