Found in a Radio Electronics store from the 90s, this circuit acts on the alternator. The circuit uses a 2N3055 that must be equipped with a good heat sink.
This circuit came out in an English publication of 1976, but it can be easily assembled using...
When light fails to focus on the sensor, a common photo-transistor, the relay closes its contacts....
This traditional clock circuit with common CMOS components with discrete logic functions was found...