CHRISTMAS_LIGHT_DIMMER

Published:2009/7/14 12:25:00 Author:May | From:SeekIC

This is based on a standard diac/triac dimmer configuration, which has been optimized for this application. Resistor R2 is, however, optional and was included only to help discharge the capacitors quickly. All capacitors are 260-Vac X2 rated (this is very importctnt), all resistors are 500-V working voltage, and triac CSR1 was chosen for its low holding current so that it would function with small loads. Note that VR1 is fitted with a double-pole mains switch for complete isolation. Even with only one 20-lamp string plugged in (22 W), control is very smooth with barely any trace of hysteresis. This circuit can be built safely on a piece of matrix board, wired point-to-point, provided it is mounted in a completely insulated plastic case and that no external components (i.e.,S1 and VR1) are metal.(Do not build this circuit if you do not understand the safety requirements.)



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