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Circuit Skills: LED Color Organ

This project by Collin Cunningham will cover a number of concepts fundamental to analog electronics - frequency, filters, signal & ground relationship, etc. - as well as incorporating build techniques from past installments of the series.

Circuit Skills:     LED Color Organ

Long before the dawn of digital music, folks employed the power of the electric color organ (aka “light organ”) to add some synced visuals to their hi-fi experience. Schematics for building such a beast based on AC power and incandescent bulbs can be be found fairly easily on the web, but plans for comparable LED-based designs seem a bit harder to come by.

Adapted from Aaron Cake’s 3 Channel Spectrum Analyzer, Collin built his own analog LED Color Organ to enhance the aural experience. The circuit uses 4 operational amplifiers plus ultra-bright 5mm LEDs to respond visually for bass, mid, and treble frequencies.

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Steps

Step #1:

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Circuit Skills:     LED Color Organ

The circuit uses 4 operational amplifiers plus ultra-bright 5mm LEDs to respond visually for bass, mid, and treble frequencies.

Step #2:

PrevNext
Circuit Skills:     LED Color Organ

In order to simplify the construction process, Collin drew up and printed a label specifying the pinout for quad op amp ICs.


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