Smoke alarm circuit

  
Circuit works: When the gas sensor MQK-2 surface adsorption or smoke when combustible gas, which inter-electrode resistance BL plummeted, this time by the Rp2, R1 and BL electric poles between resistance partial pressure node C potential drop, when it fell to the potential after less than 1/3 Vcc only flip IC1 output low to stop the alarm.
Smoke alarm circuit - schematic




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