The cross sectional view of a diac showing all its layers and junction is shown above figure.Diac is a two electrode device,it can conduct in either direction.Terminals are denoted by T1 and T2.word diac stands for ‘diode for ac‘.The four layer are pn pn and pn pn’. Symbol Principle of Operation When T1 is positive with respect to T2,the layers p-n-p-n starts conducting.This happens when voltage of T1 is more than break over voltage VB01.Once the conduction starts,the current through the diac becomes very large and has to be limited by the external resistance in the circuit.When T2 is positive with respect to T1 the layers p-n-p-n’ conducts.This happens when the voltage of T2 exceeds break over voltage VBO2.In both the cases the current during blocking regions read more

If you enjoyed this post, make sure you subscribe to my RSS feed! Read more »