In this 220 v blinking led circuit, we powered a 3-volt dc led directly with 220 V AC. This circuit can be used in special places to identify the main voltages. The capacitor is charged by a 470 k resistor and diode.
The capacitor is charged by a Diode IN4007 and 470k resistor. The capacitor is voltages are 35v when capacitor charging reached 35 volts the disc breakpoint reach ( diac can block a maximum of 35v).
DIAC stands for Diode for AC it is a two-terminal device. It is a combination of parallel semiconductor layers that activates current only in one direction. It consists of two terminals namely MT1 and MT2. DIAC is used which is basically equivalent to two diodes connected in reverse. Whenever the voltage across break over-voltage, it starts conducting and remains in conduction state until the current flowing through it.
The above symbol clearly shows that diac is a combination of two diodes.
Circuit diagram 
Components Required
- Diac DB3
- Diode IN4007
- 470k resistor
- 1k resistor
- LED
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