This circuit is from a publication from the 70s. The operational amplifier is from the period. Modern equivalents according to the motor current must be used.
One of the most traditional voltage regulator circuits, quite old, but still in frequent use even...
Found in a 1968 US publication, this circuit produces a delayed pulse with the negative transition...
This circuit is from a 1969 EEE magazine. The transistors are from that time, but the circuit can...