Gas / smoke alarm circuit diagram

Published:2011/6/14 3:29:00 Author:Lucas | Keyword: Gas, smoke , alarm | From:SeekIC

The gas / smoke alarm circuit is shown in Figure, and it is composed of the power supply circuit, sensor and multivibrator. One way of the 220V mains electricity bucked by the transformer, rectified by full bridge, filtered by capacitor and through the three-terminal voltage regulator can provide +S V voltage for the gas sensor, the other way can directly supply multivibrator speaker. Sensor uses QM-N 5 or QM 211 type. It is a relatively strong universal gas sensor which is suitable for the smoke and fire caused by natural gas, coal gas, LPG, gasoline, carbon monoxide, hydrogen, alkanes, alcohols, and wood, paper; cloth, hair products, rubber products, plastic products and oil and so on.



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