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low-cost-fire-alarm-circuit

low-cost-fire-alarm-circuit

++9V DCQ1BC177R1470KPRESET100KR2Q2BC108C12.2μC2100μF1KR3Q3AC128D11N4007NONCK1LOW COS FIRE ALAM CIRCUITC9VSPDTRELAYLow Cost Fire Alarm Circuit
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publish time: 2020-10-26
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Transistor BC177 (Q1) is used here as a fire sensor.As the temperature rises, the leakage current of the transistor also increases.When designing the circuit, the transistor Q2 will be offset as the leakage current of Q1 increases.As a result, when there is a fire, the transistor Q2 will conduct.Q2 emitter (BC 108) is connected to Q3 base (AC 128).

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