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Flashing light indication light switch circuit

2017-02-04 14:00  
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Flashing light indication light switch circuit
When S is closed, the light E is lit normally, flashing light indication circuit does not work because of losing power. When S is open, 220V AC is rectified by bulb E and diode VD1, and buck limited by R to charge for the capacitor C. The circuit uses the charging and discharging principle of capacitor C and two - way trigger diode VDH negative resistance to form a relaxation oscillator, so light-emitting tube LED flashes at night, and it is very eye-catching to make it easy to find the switch position.