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This circuit is from a 1967 RCA SCR manual. The circuit uses components from the era that can be replaced by modern equivalents. The transformer is 12 V x 1.2 A.
This circuit was found in documentation from the 80s. The components are from the time, but the...
This circuit is from Philips' 70s documentation. Transistors can be replaced by modern...
This circuit was found in a 2006 publication. It uses discrete components and CMOS that are still...