Question

Principle of operation of Diacs using the four layers ​

Answer 1

Step-by-step explanation:

It is a device which consists of four layers and two terminals. The construction is almost the same as that of the transistor. But there are certain points which deviate from the construction from the transistor. The differentiating points are-

There is no base terminal in the DIAC

The three regions have almost the same level of doping

It gives symmetrical switching characteristics for either polarity of voltages

DIAC Diode

Answer 2

Unless the applied voltage falls below the break over voltage, the DIAC can carry current in either direction. If the applied voltage at MT1 is higher than that at MT2, the junctions at the ends take on a forward bias, while the middle junction takes on a reverse bias.