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Tone actuated relay

2017-08-16 02:46  
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The circuit is built around theLM567tone decoder IC that requires about 100 millivolts at its operating frequency. The frequency is set by a 10K variable resistor and can be between 700 and 1500 He.When a tone at the set frequency is present, the 567`s output goes low to energize a relay through a2N3906PNPtransistor.

Tone-actuated relay 



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