Illumination Controller (7)

Published:2011/7/6 0:26:00 Author:Sue | Keyword: Illumination, Controller | From:SeekIC

The 220v ac voltage will generate 9V voltage after it is rectificated by VD13-VD16, reduced by R3, stablized by VS, filtrated by C3. The voltage will provide IC1 and IC2 with working voltage. After the multivibrator begins to work, IC1's pin 3 will output oscillate signals which will serve as IC2's count pulse. Then IC2 begins to count and Y0-Y9 will output high level in turn. When IC2's Y0 terminal(pin 3) outputs high level, its high level will be put on VT1's gate electrode through VD1 which will make VT1 connected. The first circuit of illuminations HL1 are illuminated. When Y1 terminal outputs high level, Y0 terminal has low level again. VD2 is connected which will make VT2 connected. The second circuit of illuminations HU are illuminatedwhile HL1 are off.



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