Published:2011-5-5 4:13:00 Author:Ecco | Keyword: Christmas light | From:SeekIC
The chart shows the Christmas lights circuit composed of simple, inexpensive CD4069 six-inverter, it can control 4 loops with 200 light-emitting diodes (50 per channel), and they are directly driven by the 220V power supply and does not need power transformer. Ater the power supply rectified by VD1 ~ VD4 bridge, it is filtered by the partial pressure on R1, R5 and C1, the two ends of the C1 will get a DC voltage with about 6V for IC1 (CD4069). D5 and D6 form gate low-frequency oscillation. The frequency is adjusted by RP. Its output passing a combination shaping by D1 ~ D4 could control the four transistors with high back pressure (2N3440/2N3439) VT1 ~ VT4. The per channel of VT1 ~ VT4 uses 50 LEDs as Illumination load. RP2 ~ RP5 are used to adjust the VT1 ~ VT4 to adapt to different working conditions of the lantern load.
Reprinted Url Of This Article: