Analysis of the mains leakage alarm circuit using CD4069

Figure (a) shows a leakage alarm made with a CMOS six-phase inverter CD4069. Normally, the audio oscillator composed of the gate A, the gates B, R2, and YD has no current passing through without sounding. When the electrical leakage of the outer casing is inserted into the three-hole socket, the leakage current flows from the power supply wire through the electrical casing to the grounding socket of the three-hole socket, and then returns to the power supply neutral line through the alarm to form a loop, and the leakage current is stepped down by R1 and VD rectified. The subsequent pulsating current causes the alarm to sound. The leakage alarm current of this circuit is less than 0.3mA.

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Figure (b) uses a CW9300 music IC to make a leakage alarm. Since R1 and VT constitute a highly sensitive trigger circuit,

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