This medium power circuit is from an English publication from 1989. The integrated circuits are of types that are still obtainable. The power supply must source at least 2A.
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Available at Mouser Electronics this component of Diodes Incorporated consists of a voltage...
Found in Radio Electronics this circuit uses a fotodiac to drive a triac. The circuit can use...
The first circuit was suggested by Analog Devices (www.analog.com) in its Application Note AN-411...