This control circuit using a low voltage switch was found in the September 1987 Radio Electronics magazine. The triac must be matched to the load and the mains voltage.
This circuit for demonstrating a sampling and holding configuration was found in a Popular...
This symmetrical limiter or reaper circuit is based on a zener diode. Voltage drop across common...
This switched power supply was found in a 70s documentation. The basic components are from that...