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DIAC
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==Applications== DIACs and SIDACs are often used to deliver a pulse once a capacitor has charged to the breakdown voltage, giving both controlled delay set by the charging resistor and a fixed pulse energy set by the capacitor and breakdown voltage. This is common in simple phase angle controls for AC lamp dimmers and motor speed controls. They may also be used to sense over-voltage fault conditions to provide a '[[Crowbar (circuit)|crowbar]]' function to operate a [[fuse (electrical)|fuse]] or a latching alarm that can only be reset by removing the supply.
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