Triac gas - smoke alarm circuit schematic

  
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In the event of combustible gas, the conductance of TGS308 gas sensor increases, and the voltage is removed through the potentiometer RP1 slide point, and its value is increased from normal 3V rms to 20V. This elevated voltage is added to transistor VT1 through diode and 4.7k? resistor, so that VT1 gets conduction, then Triacs 2N6070A gets conduction. Thus,..
Triac gas - smoke alarm circuit schematic - schematic




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