Radio control

  
A simple and effective receiver for actuating garage doors, alarms, warning systems, etc. The SCR, which has a very low trigger current 30 µ is typical—it requires an input power of only 30 juW to activate the relay. A high Q tuned antenna circuit assures rejection of spurious signals. A whip or wire antenna is adequate up to 100 feet from a low power transistor transmitter.
Radio control - schematic

A momentary-off switch resets the circuit.




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