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.
In the figure we have a circuit of a dimmer for fluorescent lamps. The circuit is from...
This circuit was found in a 1967 US documentation. The circuit applies to modern general purpose...
This configuration is traditional and can be found in many other circuits in this section. The...