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LED blinker directly with 220 volts AC: 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's voltages are 35v when capacitor charging reaches 35 volts the disc breakpoint is reached (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 a conduction state until the current flow through it.
DIAC is an electronic device from the thyristor family. DIAC is an aggravation of Diode Alternating current. DIAC works both reverse and forward bias and it works during a positive half-cycle and also during a negative half-cycle of the AC waveform. It is a bidirectional semiconductor switch and can be turned on in both forward & reverse bias polarities of AC signals. The given below pic clearly shows that DIAC is a combination of two diodes and we have also made a complete circuit with the DIAC device.
When the positive supply with MT1 and negative supply with MT2, is applied in this condition Only P1 will work and N1 will not work and P1 & N1 will be in Forward bias, N2 and P2 in Reverse bias, and P2 and N3 in Forward bias. The Middle junction is in reverse bias. When N2 and P2 are in reverse bias there is very low leakage current flow due to minority carriers.
