A qualitative test capacitor leakage circuit ----- Capacitor Leakage Tester

A qualitative test capacitor leakage circuit, Capacitor Leakage Tester Keywords: LF357, capacitor leakage test circuit diagram The electrolytic capacitor time will have a long-term leakage, and the circuit shown by the drawings allows you to test the leakage of the capacitor and determine if they are worthwhile, you can suppress leakage by CREF / RREF. The ratio in the drawings is suitable for universal testing of all capacitors such as 1 ptopharacemic capacitors to 1000 microscopic electrolytic capacitors. The value of CREF in the circuit is similar to the value of the capacitor CX to be tested, and you can also select RREF by a rotary switch to make it greater than or less than 22mΩ. working principle When the button is on, the capacitors CREF and CX are charged by their respective PNP transistors. When the switch is open, the capacitor Cref and CX start discharge. It is assumed that the CREF is in a good state, which has an additional discharged outer resistor RREF, and the capacitor CX is tested through its internal resistance. If the discharge of CX is faster than the discharge of the RREF, the voltage will drop faster, so that the operational amplifier input voltage will be lowered than its reverse end, forcing the output of the operational amplifier to be low, thus Light red light emitting diode. The light-emitting diode indicates that the capacitor CX is allowed to be tested, and the test circuit indicates that even a 1 natal ceramic capacitor is adapted to compare reference. Please check the nominal voltage of the capacitor CX before testing before testing. The operational amplifier LF357 has a minimum supply voltage of 10V. This test circuit only selects a 6V voltage to allow the capacitor CX to be tested to a low upper limit voltage. Author: Zhu Shaohua

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