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Old 28th November 2012, 08:10 PM   #1
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Join Date: May 2012
Post Multi Active Band-Pass Filter Equalizer (Guitar Pedal)

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I'm building a simple equalizer guitar pedal. I have three simple band-pass active filter circuits in the picture.

Low (Bass) center frequency band: 78Hz (5% tolerance)
Middle center frequency band: 1.15kHz (2% tolerance)
High (Treble) center frequency band: 7.8kHz (2% tolerance)
Equalizer Control will vary up to +/- 15dB per band

I believe I have met the specifcations above. Now I'm breadboarding a working model.

Could someone help me with a feedback loop?
Any help or suggestions on my schematic would be appreciated
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Old 30th November 2012, 02:59 PM   #2
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Join Date: Jan 2004
Location: Near Vancouver
I've moved this to here. Hopefully you'll get a response now.
planet10 needs your help:
Let's help Ruth and Dave
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Old 30th November 2012, 03:54 PM   #3
JMFahey is offline JMFahey  Argentina
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Join Date: Mar 2009
Location: Buenos Aires - Argentina
Well, for one you just can't wire together 3 Op Amp outputs, they short each other.
What are you trying to design?
Some new kind of equalizer?

Last edited by JMFahey; 30th November 2012 at 03:57 PM.
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Old 1st December 2012, 03:17 PM   #4
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Thank you for the moving the thread. =) Yeah, they should not be tied together. I have three separate band-pass filters on my breadboard at the moment. Just my bass band-pass is connected in the picture below. I was expecting to hear a distorted tone since I don't have my split rail power supply connected, but I can only hear a tone when my 100k pot (gain) is almost 100%

I'd also like to be pointed toward some information on a split rail power supply using a single 9v battery. Any help will be VERY appreciated.

here is a picture my of what I have wired at the moment.
Click the image to open in full size.

I used this wiring diagram for the pedal itself.
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