Suggested by Motorola documentation from the 1980s, this circuit can be implemented with equivalent power MOSFETs. The type depends on the current of the controlled motor, as well as the diodes.
This simple photometer uses a 0-200 µA galvanometer as indicator. The sensor is a common LDR and...
This circuit is from the Motorola Linear Databook of 1990 and can be implemented with other...
This circuit triggers a warning oscillator if you forget the lights on when you leave the car. The...