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 originally created to increase the power of car radios of the 790s and 80s that...
We found this circuit in a European schematic manual from the 1980s. The circuit is still current, and...
This circuit with unijunction transistors was found in a documentation from the 80's. The trigger...