Sound Controlled LED Color Variable Illuminations

Published:2011/5/10 1:59:00 Author:Sue | Keyword: Sound Controlled, LED, Color Variable, Illuminations | From:SeekIC

Working Principle: As seen in the figure, the sound controlled LED illuminations circuit consists of audio amplifying circuit, LED drive control circuit. The audio amplifying circuit consists of BM,V1,V2,R1-R6,C1-C3 and RP. LED drive control circuit consists of IC1-IC3,VL1-VL10 and R8. Sensor BM put the audio signals which are amplified by V1,V2 onto IC1's 14 pin(CP terminal) as counting clock pulse. IC1's 3 pin(YO terminal), 2 pin(Y1 terminal) can provide IC2,IC3 with counting signal. Y2 terminal can provide 15 pin (resetting terminal) with resetting signal. Among IC2,IC3's output terminals(YO-Y9 terminals) there are bicolored illuminated diode VL1-VL10. When IC2 and IC3 output high levels at the same time, the outside illuminated diodes will demonstrate orange color, or it will show red or green color. As the space limited, the circuit only show VL1 and VL10 without VL2-VL9. And there is only one group of LED demonstrating circuits. When in practise, the numbers of illuminated diodes can be adjusted according to reality. When we adjust the value of RP, we can change the level output to IC1's 14 pin, which will change the LED effect.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Signal_Processing/Sound_Controlled_LED_Color_Variable_Illuminations.html

Print this Page | Comments | Reading(3)