Series photoelectric couplers control thyristor switch circuit

Published:2011/8/29 0:48:00 Author:Jessie | Keyword: Series photoelectric couplers, thyristor switch | From:SeekIC

When the combustible gas appears, TGS308 gas sensor's conductivity increases,and thevoltagepassing potentiometer RP1's sliding point increases from normal 3V RMS to 20V. This increased voltage added to transistor VT1 makes2N6070A connect. The waveAC voltage driver H produces 90dB sounds torealize alarm. H is Delta16003168 24V AC alarm.After gases disappears from the sensor, circuit recoverys original state, so alarm automatically stops.



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