LED Festival Illumination Controller (3)

Published:2011/7/10 8:10:00 Author:Sue | Keyword: LED, Illumination, Controller | From:SeekIC

The 220v ac voltage will provide the square wave oscillator, control circuit, drive output circuit with +12v direct current voltage after it is reduced by T, rectificated by UR, filtrated by C7,C8. The square wave pulse output by D1 will control D3-D6 by V1-V4. The square wave signals output by D2 will control D3-D6 by V5-V8. When D1 outputs low level, V1-V4 are connected. D3-D6 will stop oscillating because its input terminals are forced to have high level. D3-D6 output low level. Vg-V12 are disconnected at the same time. VL1-VL14 are off at the same time. Then D1 outputs high level which will make V1-V4 disconnected. Square wave oscillator composed of D3-D6 will begin to work. V9-V12 are connected intermittently under the control of square wave pulse. VL1-VL24 are illuminated.



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