220 Volts Flashing Lamps

Posted on Feb 6, 2014

This circuit is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. The device formed by Q1, Q2 and related resistors triggers the SCR. Timing is provided by R1, R2 & C1. To change flashing frequency don`t modify R1 and R2 values: set C1 value from 100 to 2200 µF instead. Best performances are o

220 Volts Flashing Lamps
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btained with C1=470 or 1000 µF and R4=12K or 10K. Due to low consumption of normal 10 or 20 lamp series-loops intended for Christmas trees (60mA @ 220V typical for a 20 lamp series-loop), very small and cheap SCR devices can be used, e. g. C106D1 (400V 3. 2A) or TICP106D (400V 2A), this last and the suggested P0102D devices having TO92 case. If you are unable to find these devices you can use Triacs instead. In this case the circuit operates also with relatively powerful devices. A recommended Triac type is the ubiquitous TIC206M (600V 4A) but many others can work. Note that in spite of the Triac, diode bridge D1-D4 is in any case necessary.

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