The trigger operation of the diac is similar to that of a unijunction transistor, except the diac is a uni-directional device.

Name: The trigger operation of the diac is similar to that of a unijunction transistor, except the diac is a uni-directional device.
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The diac is actually a bi-directional device, conducting current in both directions once its breakover voltage is reached, unlike a unijunction transistor which is a unidirectional device.

The Trigger Operation of the Diac Is Similar to That