Anti-static soldering iron safety power socket ----- Outlet

Anti-stationary iron safety power socket, Outlet Keywords: anti-static soldering iron safety power socket Because the input impedance of the CMOS integrated circuit and field effect tube is extremely high, any static induction or leakage of electric soldering iron in the manufacturing repair of the circuit will cause damage to the device. In order to prevent the occurrence of such accidents, it is often required to ground the soldering iron used. However, due to the use of electric soldering iron in actual operation, it is too frequent, and its grounding state may change at any time. In order to be discovered in time when the ground is poor, an example of a solder iron safety power socket is introduced. When the ground is poor, it can signal, the circuit composition is shown. Circuit Working Principle Analysis The main part of the circuit is a audio oscillator composed of 555 circuits and R2, and C2. When the ground is poor, it will send a warning signal through the crystal speaker to inform the operator take measures. In this circuit, the 4 foot of the NE555 and the outer casing of the soldering iron are grounded together by the ground end of the power outlet. When the grounding state is good, since the foot is clamped at a low level, the NE555 is reset, the oscillating circuit is stopped, and since the 3 foot outputs low, the green LED1 illuminates, indicates that the ground is good. When the ground is poor, the DC operating power voltage passes the R3 to 4 foots, so that the reset state of the NE555 is released, and the oscillation circuit oscillates sounds, and the red LED2 is flashed.

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