Gas alarm circuit that can automatically generate negative ions and ozone

This gas safety alarm can automatically sound an alarm, and can also automatically generate negative ions and ozone in the air , so that CO gas, the main component of the gas, and ozone 03 combine to form C02, which is non-toxic to humans. This can be removed in the case of
trace gas leaks.
poisoning accident.
    The device includes an alarm part and a negative ion generator part. The alarm part consists of a power supply circuit, a gas-sensitive detection circuit, an electronic switch
circuit and a sound and light alarm circuit. The voltage-stabilized power supply adopts a series transistor voltage-stabilizing circuit (
composed of transistors VTi, VT2, etc.) to provide 12V DC power supply after stabilization; the gas-sensing detection circuit consists of gas sensor QM-N5, potentiometer RPi,
resistor Rs and indicator light H; the electronic switch circuit is composed of JEC-2 Schmidt integrated circuit Ai and transistor VT3; the alarm
circuit is composed of 555 time base integrated circuit A2, light-emitting diode VL, speaker B and resistance-capacitance components; open air
negative The ion generator consists of a triac V, diodes VDi, VDz, step-up transformer T2, resistors R]1-R13 and capacitors
C5~C7.