LED's... sound reactive?

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stahlm004443

Member
Joined 2011
so i was wondering...

im in the process of constructing a battery powered boom box, and i got some leds to make it look nice :p

but if i wired them to the amp output so they go with the music would it affect the sound that much? i dont really want any distortion or loss of volume.

here are the LED's

there is tech spec on the page somwhere. but it means nothing to me lol.

thanks!!!
 
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dangus

Member
Joined 2004
Better to use an LED bar graph driver, like an LM3914/3915/3916 (whichever are the logarithmic ones), or one from a more consumer product oriented brand like Rohm. Or do the brute force comparator thing using LM324 and resistor ladders. Download a Rane mixer schematic and see what circuit they used. Or salvage the chip and display from scrapped consumer gear. Wiring a matrix of LEDs and scanning with a 4017 should make for a lively display.

For higher power stuff, Velleman sells a speaker-powered LED display kit, K4307.
http://www.vellemanusa.com/downloads/0/manual_k4307.pdf
Seems overpriced (two channels worth would cost more than I paid for my new Blu-ray player), but the schematic and parts list are in the manual (see above).

Search ebay for LED vu and a few other kits show up.
 
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