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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 obtained in a 1978 magazine but can be easily assembled today with a BC547...
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...
This configuration from an American publication from the 1970s shows how to use a pair of power...