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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 has a start and reset switches and can generate signals at long intervals determined by the...
Found in a Popular Electronics from the 90s, this circuit uses a double 555 to emit beeps when the...
The components used in this 80's circuit are not common today. The circuit is very sensitive and must...