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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 consists of a simple capacitance bridge. The handset can be high impedance from 500...
This simple wireless microphone circuit for the MW band was found in an old American...
This astable with active cycle adjustment was found in a Popular Electronics from the 90's. The...