Diac Pin Diagram. You can see in the above circuit diagram the pin 1 and 2 of the optocoupler are connected to a dc source through a switch and a resistor. Here the photo diac optocoupler is used to trigger the triac.
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A diac is able to improve the performance of the triac circuit because its switching characteristic is far more even than that of the triac. The diac has four layers pnpn and two terminals anode a1 and a2. When switch on the voltage across diac goes more than break over voltage and flows a current across it and triac get a voltage on gate terminal.
A diac is able to improve the performance of the triac circuit because its switching characteristic is far more even than that of the triac.
In the given circuit diagram a capacitor and a diac is connected in series with the gate terminal of a triac. A diac is a device which has two electrodes and it is a member of the thyristor family. The diac is made of a five layered structure. As mentioned earlier the diac has two terminals namely mt1 and mt2 and it can deliver current flow in both directions.
