Design for LED Color Organ

L

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).
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
 
LightBoy wrote:
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).
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
Click to expand...
Modulate is a very vague word in this context. More specific
description of the desired relationship between sound and each light
will lead to more useful answers.
 
Thank you for your response. I will try to clarify. 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. Is that more helpful?
Thanks!
 
On Wed, 09 Mar 2005 17:11:07 -0800, LightBoy wrote:

Thank you for your response. I will try to clarify. 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. Is that more helpful?
Thanks!
Click to expand...
Just make some bandpass filters, rectify and filter their outputs, and
use the voltages to control the LED power supplies.

Good Luck!
Rich
 
Thank You for your reply! You have a GREAT looking site - and have done
some really neat stuff!

It may be I will use something similar to your design - but I was
hoping to find something without going to a PIC design. But what you
have created certainly intrigues me. A PIC programmer I am not, but I
have a good friend who is.

Thank you again for showing me a really neat design!
Blessings!
Don H
 
Thanks, Rich,

I guess I was hoping to find something "ready made" and not have to
experiment too much. Like not having to "re-invent the wheel." A
previous reply by Luhan Monat (above) intrigues me - but I will look
into your suggestion also.

Many thanks for taking the time to reply and for your kind help ....
Don H
 
LightBoy wrote:
Thanks, Rich,

I guess I was hoping to find something "ready made" and not have to
experiment too much. Like not having to "re-invent the wheel." A
previous reply by Luhan Monat (above) intrigues me - but I will look
into your suggestion also.

Many thanks for taking the time to reply and for your kind help ....
Don H
Click to expand...
National Semi has out a brand new chip designed to drive LEDs in a
'color organ' manner. They're featuring it on their website, so it
should be easy to find, although they don't use the 'color organ'
phrase.

Paul Mathews
 
Thanks, Paul,

I'll go to their site to see if I can find it!

Don H
 
Sounds much like a graphic equaliser display.

I think I saw one which used an LM 3914/3915/3916 bar-chart driver to do one
vertical bar which was then rapidly multiplexed through 10 or so spectral
channels. This allowed it to drive a 10x10 matrix of LEDs.
 
Found it, Paul.

It looks like the perfect solution. However, need to find a distributor
who stocks it. Minimum order is 1000 until - at 90 cents a copy.
Sheesh! So far can't find it in stock anyplace - maybe its too new yet.
I will keep trying.

Thanks again for the info!
Don H
 
Thanks, Kryten,

Interesting concept. I will check into this, also.
Thanks for taking the time to respond.
Gratefully,
Don H
 
Ask a Nat'l rep to get you a sample. Ask nicely.
Paul Mathews
 
Thanks, Paul,

I have done that. I will see if they follow through.
Don H.
 
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