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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.
Using only one integrated circuit this control was found in an 80's Electronic Engineering. The circuit...
We found this circuit in a 1975 radio amateur documentation. The circuit uses TTL technology and...
The transistors of this circuit found in an English 1980s documentation may be the modern BC548...