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LED Color Organ Circuit

Discussion in 'Electronic Basics' started by LightBoy, Mar 10, 2005.

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  1. LightBoy

    LightBoy Guest

    Greetings to all -

    I am designing a device that uses 7 modules of colored LED's that will
    be used for a specific purpose for a client. As part of that design, my
    client wants to be able to modulate these 7 modules with sound -
    voice, music, etc. (Either by microphone or low level input from a
    music source).
    By "modulate" I mean the intensity of illumination of each 6 LED module
    would vary in sync with the volume level of the music - within each
    specified bandwidth of any channel's frequency. As is Low - Medium and
    High frequency bands.

    I have found several schematics on the Internet labeled as "color
    organs" but most are only one or two channels - and virtually all use
    SCR's to modulate Line Voltage to control incandescent lamps. Does
    anyone have - or can anyone point me to where I can find at least a 4
    channel schematic - that could be adapted to each channel controlling a
    cluster of 6 LED's?

    I would be very grateful for any information anyone here could supply.
    Very best regards.......
    Don H
  2. Well Don,

    Seems like you have to do some designwork on your own. Cannot be that
    difficult. You only need a bunch of OpAmps and maybe some transistors. No
    need to connect LEDs to the mains so an 18-24V power supply will do. One
    non-inverting amplifier to obtain the required signal level. Set of active
    filters to split the frequency range in the bands you need and a amplifier
    or transistor for each band to drive the LEDs. I have no source at hand for
    calculating the filters but a google for "active filters" or "active audio
    filters" will give you plenty of hits.

    petrus bitbyter
  3. LightBoy

    LightBoy Guest

    Dear Petrus,

    Thank you for your suggestions. It does look as if I will have to
    follow your advice. I was just hoping that someone had already done
    something like this before and posted it somewhere - so I wouldn't have
    to start at that level. I was directed by another form to a circuit
    with 6 channels - using a PIC - that's intriguing, but then I'd have to
    get into PIC programming. Not sure I want to get into that yet - but I

    Thank you again for your kind response....
    Don H
  4. Rich Grise

    Rich Grise Guest

    Hasn't anyone suggested you go to google search and search for "color

    Good Luck!
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