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Posts tagged DIAC

Full-wave Phase Control Using Lower Voltage DIAC Circuit Diagram

The DIAC, or diode for alternating current, is a trigger diode that conducts current only after its breakdown voltage has been exceeded momentarily. Most DIAC have a breakdown voltage around 30 V. The following schematic shows typical DIAC Full-wave Phase Control Circuit Using Lower Voltage DIAC.

Basic TRIAC Light Dimmer Circuit Diagram

The following schematic shows the Basic TRIAC Light Dimmer Circuit Diagram. The circuit is designed such that only a portion of the 60Hz sine wave from the VARIAC passes through the light bulb. TRIACs are electronic/ semiconductor devices equivalent to two silicon-controlled rectifiers (SCRs/thyristors) joined in inverse parallel, that is, once they are triggered, they continue conducting current until the current drops below the hold current, typically around the zero point (null) in the mains waveform.