This circuit was found in a1980s Motorola documentation. The integrated circuit is from that time. The frequency depends on the crystal.
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...