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 Circuit / Schematic diagram of  Description
   
3 Channel Spectrum Analyzer .
3 Level Audio Power Indicator .
Audio Level Meter Audio levels can be monitored using a small panel meter with this circuit built from discrete components.
Peak Level Indicator  
Peak Reading Audio Level Meter  
Sound Detector Latch Simple circuit based on 555 timer
Color Organ-1  
Color Organ-2 Color organ lights different color bulbs according to the different
Color Organ-3 frequency of sound.
Color Organ-4 .
Color Organ-5 .
Color Organ for Car  
   
   
   
 
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