We found these circuits in a Popular Electronics from the 90s. The circuit has a simple low power version and a higher power version with MOSFET (VMOS) of the time.
This symmetrical power supply uses regulators from the 78xx and 79xx series and can be adapted to supply...
Found in a Radio Electronics from the 90s, this circuit generates a 1 kHz signal to serve as a...
This circuit activates an incandescent lamp at dusk and goes out at dawn. The sensor is an LDR and...