Simple gas and fog alarm circuit

Published:2011/8/17 21:10:00 Author:Jessie | Keyword: gas and fog alarm | From:SeekIC

555 time-based circuitforms theself-excited monostable multivibrator, and itusesingeniouslyreset server to trigger. When gas-sensitive device access to flammable gas, its resistance reduces, thenthe time-based circuit's reset end potential rises. When integrate block is in1/3 working voltage, it willsend outa warning signal, so it has the characteristics of high sensitivity. Power transformer B's output poweris greater than 5W, and the secondary voltageis 9V. Gas sensor uses QM-N5 or MQ211, which is a relatively strong universal gas sensor for natural gas, coal gas, liquefied petroleum gas, gasoline, carbon monoxide, hydrogen, alkanes and so on.



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