Found in an American publication from 1968, this circuit aims to keep the torque of a DC motor constant. The power transistor depends on the motor.
This circuit is from 1995 documentation. In the original, the source is symmetrical at 12 V, but...
We found this circuit in a 1988 documentation. It is a protective system that automatically shuts...
Found in the September 1982 issue of Radio Electronics magazine, this circuit triggers a relay...