This circuit is from a 1980s Motorola documentation. The circuit can be made with modern equivalent components. The original circuit is for the 115 Vac (110 V) grid and has two settings.
This circuit was suggested by Texas Instruments in the January 1973 issue of Radio Electronics magazine....
This audio amplifier circuit was found in Radio Electronics magazine from June 1966. The circuit is a...
This semi-proportional temperature control was found in old American documentation. The components are...