In this 220v blinking led circuit we powered a 3 volt dc led directly with 220V AC. This circuit can be used on special places to identify the main voltages. Capacitor is charged by 470k resistor and diode.
The capacitor is charged by Diode IN4007 and 470k resistor. Capacitor is voltages are 35v when capacitor charging reached on 35 volts the diac break point reach ( diac can block maximum 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 diode.
- Diac DB3
- Diode IN4007
- 470k resistor
- 1k resistor