Leakage Tester ----- Leakage Tester

This is a telemetry tester that does not need to be directly in contact with the surface of the current. It can also be used to check if there is electricity in the power cord, power switch, and other objects. This circuit passes the electromagnetic field emitted by a coil detector. The coil is a coil on the ordinary 6V relay. The electromagnetic field of the AC wire generates a voltage in the coil, which is sent to the same phase input sheet of the op amp comparator IC1 after the D1 to D4 bridge. Since IC1 input impedance is high, it is extremely sensitive to tiny voltage changes. The voltage open loop gain of TL071 is about 100 dB. The inverting input of IC1 2 is set to the adjustable voltage with VR1. R1 prevents the protection effect when VR1 is rotated, and R2 is a feedback resistor. The IC1 outputs the signal input foot 5 that is sent to IC2 after adjusting VR2, and R3 is also the protection resistor. IC2 is a single-chip integrated circuit LM3915 for simulation display. IC2 luminance foot 5 increases by 0.5V, and its output is lowered. The ⑨ foot opening of the IC2 can get a point mode display mode. When the input pin 5 receives 0.5V, the green LED1 illuminates. When the voltage is increased to 0.75V. Yellow LED2 shining. When the voltage is increased to 1V, the red LED3 illuminates. Therefore, through the display state of the LED. It can easily detect the strength of the leakage current. Correction and setting of the circuit: Spin the VR2 in the counterclockwise direction and slowly adjust the VR1. Until LED1 lights. This represents the electromagnetic field around the circuit. The probe is then proximally adjacent to the AC wire, such as LED2, indicating that there is a current. If the probe distance is closer, the LED3 illuminates, and the LED2 is off. After setting, the center contact position of VR1 and VR2 is fixed by rubber. The probe is close to the ground pipeline, such as LED2 and LED3, indicating that the current is leaking through the leakage pathway. The circuit can be installed on a normal PCB board and enclose in a plastic box. Touch the needle with a multimeter, connect it to the circuit with a 30 cm long soft wire. Note: Do not touch the probe directly in contact with exposed power points or AC outlets directly. Because weak leakage can make the circuit work normally.

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