Light Dimmer Using Diac or transistor and triac and description

Posted on Feb 5, 2014

The lighting source (i. e. bulb, tube light) glow according to their specified watt rating. If we need more light then we have to use high watt bulb at the same place if we need low light we have to replace high watt bulb with low rating. But What if there is not necessary to change i. e. different brightness obtained from same source. Here is the s

Light Dimmer Using Diac or transistor and triac and description
Click here to download the full size of the above Circuit.

imple but effective project which control brightness according to our use from the unchanged light source. The basic principle of light dimmer is based on phase control. The variable resistor VR2 is main controller of the circuit Light Dimer. From main supply capacitor C2 get charges which trigger DIAC D1. VR1 is used for fine brightness controller which control brightness to lower level. R2 and C3 used to overcome interference problem.

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