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Old 2nd April 2007, 11:01 PM   #1
muppers is offline muppers  United Kingdom
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Default wierd pedal request

I'm currently building a custom pedal, but I want LEDs on the side of the pedal to light up when a note is played with my guitar. I don't really know much about the guitar signal itself, am kind've following guides, so some help on how to do this would be great.

Cheers.
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Old 3rd April 2007, 06:23 PM   #2
Minion is offline Minion  Canada
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Well if this is say a Distortion Pedal you could put the LED"s in the Feedback loop of an opamp and they would Lite every time you played a Note and they would also create the Distortion sound.....

Another way I suppose would be to set up a Clipping detection curcuit and set the Clipping threshold really low so every time you played a note the LEDs would lite.......


What type of pedal are you thinking of building???
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Old 3rd April 2007, 06:56 PM   #3
muppers is offline muppers  United Kingdom
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It is infact simple switching box which I may add bass and treble controls to.
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Old 3rd April 2007, 09:34 PM   #4
poynton is offline poynton  United Kingdom
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You need a "colour organ" circuit driving LEDs - google !

Andy
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Old 3rd April 2007, 11:57 PM   #5
muppers is offline muppers  United Kingdom
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Thanks a lot for the reply.

I've been looking over colour organs, but I have one last questions.

A circuit like this for instance: http://www.aaroncake.net/circuits/organ.asp

How could i change the mic input to an input jack for guitar, and would it still work?


Any other recommended circuits would be great, cheers.
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Old 4th April 2007, 08:13 AM   #6
poynton is offline poynton  United Kingdom
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I would NOT connect this or similar circuits to a guitar as they are LIVE to Mains !!!!!!!!!!!!!!!!!!!!!!!!!!!nasty.

I have seen low voltage versions running off 12v which would be safe.

Warning over.

[A guitar could be used if the components before C3 were deleted and the input into C3 via a level control.]

Take care.
Andy

EDIT Try this :-

http://sciencelabs.com/12_volt_color_organ.asp
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