low voltage Sound to light unit?

[cyberrat]

Hello, I wonder if any of you can reccomend a 3 channel sound to light unit circuit for me?

I have 4 LED spotlights that have individual Red/Green/Blue LED's in them.

I am planning on wiring them up in my daughters bedroom at some point, with a sound to light unit that will flash them in different colours etc to the beat of the music. (she's 14 & loves this sort of thing - lol).

I have searched but not come up with much to help, does anyone know any links to good schematics for this?

Thank you, Roland.

 

[Eugen_E]

Hello,
I've seen something like this in an old local magazine - I dont know if it work great.
After you amplify the audio signal to about 1V or more, you feed it to 3 filters, built with opamps:
- low f (bass) - LPF with fc=500Hz;
- midrange - BPF with fc1=500Hz, fc2=2kHz;
- high - HPF with fc=2kHz.

The output of each filter will feed to a detector - it can be a diode rectifier - an the varying DC signal obtained will drive the LEDs.

For the filter design you can search audio dedicated sites for equalisers and stuff like that, or design your own filters.