We found this multiple thermostat circuit in July 1980 Radio Electronics magazine. It uses opto-triacs for power control and operates on a 117 VAC mains.
This circuit was found in an English publication from 1976. It generates sequential signals in the...
This configuration appears elsewhere on this site. We found it in a Motorola manual from the 70s....
This 1968 circuit makes use of MOSFETs of the time. The circuit can be mounted based on modern...