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Gas leakage automatic alarm, automatic circuit shut-off
Source: InternetPublisher:toothache Keywords: Automatic alarm D trigger potentiometer Updated: 2020/02/16
Circuit working principle: The gas sensors G and R3 in the dotted box, the potentiometer Rp3,
the resistor R1, etc. form a bridge circuit . When the gas does not leak, the bridge is in balance,
no current flows through R8, and there is no voltage pulse output. The CH4044 terminal of the D flip -flop outputs low
level, and the relay K does not close, and the green light is on at this time.
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