LED Color Organ Circuit

[LightBoy]

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

 

[petrus bitbyter]

"LightBoy" <don@nitestarrs.com> schreef in bericht
news:1110435771.541914.152430@o13g2000cwo.googlegroups.com...

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

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

 

[LightBoy]

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
might.

Thank you again for your kind response....
Don H

 

[Rich Grise]

On Thu, 10 Mar 2005 11:17:25 -0800, LightBoy wrote:

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
might.

Thank you again for your kind response....
Don H

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

Good Luck!
Rich