Combustible gas alarm circuit (1)
Source: InternetPublisher:ohahaha Keywords: Combustible gas alarm circuit oscillator Updated: 2021/08/09
Circuit working principle: This circuit uses 220 V mains power as the power supply, and obtains 6V DC voltage after capacitor step-
down, rectification, filtering, and voltage stabilization. When the combustible gas concentration reaches
the alarm point, the resistance value of the QM-N5 gas sensor decreases, VT, and VT2 are turned on, making the sound
alarm circuit work. VT3 and VT4 are audio oscillators . When they work, they emit
intermittent alarm sounds.
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