Combustible gas alarm circuit (3)
Source: InternetPublisher:宋元浩 Keywords: Combustible gas alarm circuit thyristor alarm Updated: 2020/04/25
Circuit working principle: The circuit is simple and reliable. When the combustible gas reaches a dangerous concentration
, the internal resistance of the gas sensor becomes smaller, the current flowing through the potentiometer Rp increases, the thyristor VS
is triggered, and the buzzer sounds an alarm. Thermistor Rr is used for temperature compensation. The circuit
is powered by 220 V AC mains power. The alarm is low cost and suitable for home installation.
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