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.)



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/CHRISTMAS_LIGHT_DIMMER.html

Print this Page | Comments | Reading(3)