This circuit is from Motorola documentation, but can be implemented with virtually any phototransistor and any general-purpose transistor. The supply voltage can also be changed.
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...
I found this circuit in an English magazine from July 1982. The circuit is still viable as all...
This circuit triggers a warning oscillator if you forget the lights on when you leave the car. The...