This circuit behaves as a voltage controlled resistor and can serve as a small load. The circuit is from a Radio Electronics from July 1988.
This high-power amplifier with Japanese transistors from the 70s provides an output power of 150 W...
Using the four amplifiers of an LM324 this circuit was found in the June 1996 issue of Electronics Now...
We found this control circuit for three-phase motors used in the control of doors and gates in a...