Photosensitive fuel gas annunciator circuit

Published:2011/10/23 21:56:00 Author:May | Keyword: Photosensitive, fuel gas, annunciator | From:SeekIC

Fule gas can cook dinner and heat up water. During cooking process, thesoup overfolws, it's easy to put out , andfuel gas leak indoorcan cause a loss to life and property. Installing a fuel gas annunciator can avoid accident effectively. Making material 3K, 150K 1/8 carbon-film resistor , one KD-153 music IC chip, one 3DDPhoto-Transistors, triode 3DG6, 3DG130, one8Ω speaker, switch, two dry batteries with battery clamp. Working principle When gas-cooker works normally, the annunciator is in the state of standby work. DG1 photistor receives flame shine, itpresents low resistance, BG2 breakovers, music vocal chip is in low level, speaker is not vocal. Once gas-cooker sudden dies out, photistor loses shine, its essential resistance increases, BG2gets saturation to close.



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