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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 an old publication and can be adapted for use with modern...
This interesting circuit found in a European publication from the 1990s eliminates the voice that...
This circuit can also be used as a simple thermoscope (temperature changes indicator) in the...