Christmas light circuit

Published:2011/11/7 20:30:00 Author:Ecco | Keyword: Christmas light | From:SeekIC

The chart shows the Christmas lights circuit which uses simple, inexpensive CD4069 CMOS hex inverter to control four circuits with 200 light-emitting diodes (each circuit has 50 LEDs), and it is directly supplied by the 220V power source without power transformer. The power is bridge rectified by VD1 ~ VD4, differential pressured by R1, R5 and filtered by C1, then the two ends of the C1 gets about 6V DC voltage for IC1 (CD4069). Gates D5 and D6 form the low-frequency oscillator. RP can adjust its frequency. The output is reversed-phase shaped by the combination with D1 ~ D4 to control 4 pieces of high back pressure transistors (2N3440/2N3439) VT1 ~ VT4.



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