LED Illuminations (2)

Published:2011/5/10 1:31:00 Author:Sue | Keyword: LED, Illuminations | From:SeekIC

Working Principle: As seen in the figure1-158, the circuit consists of multivibrator and LED drive control circuit. The multivibrator circuit consists of potentiometer RP, resistor R1,R2, capacitor C and time base integrated circuit IC1. LED drive control circuit consists of IC2、Vl-V6、VDl-VD8、R3-R14 and VLl-VL3l. When power switch S is connected, multivibrator begins to work and provides IC2 with counting pulse signals. By this, IC2's YO-Y9 terminals output high level one by one, and make VL1-VL31 illuminated one by one. When YO terminal outputs high level, V1 is connected, and VL1 is illuminated. When Yl and Y9 terminal output high level, V2 is connected, and VL2-VL7 are illuminated. When Y2 and Y8 terminal output high level, V3 is connected, and VL8-VLl3 are illuminated. When W and Y6 terminal output high level, V5 is connected, and VL2O-VL25 are illuminated. When Y5 terminal outputs high level, V6 is connected, and VL26-VL31 are illuminated.　 In this circumstances, LED illuminations are illuminated one by one. When we adjust RP's value, the illumination frequency can be changed.　



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