Simple touch electronic switch, leakage protector, homemade safety socket circuit diagram

The base of BG3 is connected, so BG3 is cut off, the reed switch loses power, the contact is disconnected, and the entire circuit returns to its original state.

The circuit is shown in Figure 244. In the figure, the load is a household appliance, and the housing is the housing of the household appliance. When the housing of the household appliance leaks electricity, there is a voltage VL on the ground, and the output voltage of this voltage after bridge rectification by D1~D4 is 0.9VL. Assume that the DC voltage of the coil of relay J1 is V1, when 0.9V is greater than or equal to 0.7VJ, the protector will be activated. Disconnect the load from the 220V power supply to protect people from the danger of electric shock.

A leakage indication and alarm circuit can be installed on the three-pin socket . When the shell of the household appliance leaks electricity, an audible and visual alarm can be issued. In this way, the power plug can be unplugged immediately for repair, thus ensuring safe use of electricity.

The circuit of the safety socket is shown in Figure 245. When the housing of the household appliance leaks electricity, the leakage current passes through R1 to make the neon bulb light up. At the same time, it is stepped down by C and rectified by D to make the oscillator oscillate, and the piezoelectric ceramic HTD emits a sharp alarm sound.