Smoke alarm circuit (2)
Source: InternetPublisher:小胖友 Keywords: Smoke alarm alarm circuit potential Updated: 2020/11/02
Circuit working principle: When the surface of the gas sensor MQK-2 absorbs smoke or flammable
gas, its BL inter-electrode resistance decreases sharply. At this time, the partial pressure of Rp2, R1 and BL inter-electrode
resistance causes node C to The potential drops, and when its potential drops to less than 1/3 Vcc,
IC1 flips and outputs low level, thus stopping the alarm.
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