3 band parametric equalizer not equalizing

[joefox]

Hello.
I purchased and built the following kit:
https://www.musikding.de/3-Band-parametric-EQ-pedal-kit
I can barely hear a sound difference operating the 9 eq knobs.
The only knob  that works is the global volume, making the pedal act as a booster.
I replaced all the chips with new ones, and checked the position and the values of all the components. I would appreciate if someone could give me some suggestions.
Kind Regards

[mauman]

Welcome to the forum, and congratulations on completing this build!

Some photos of your build would make it easier to help you.  While you're doing that, could you please use a meter to check the voltage from each IC pin to ground, and list them for us?  And here's the build doc for reference.

[joefox]

Thank you for your kind and quick reply. I think I solved the problem.
According to the wiring  instructions I downloaded from Musikding,
the 9v + and - had to be connected to the pins on the board named A and C.
This caused the power doubler chip to generate 16v instead of 18v. I moved the + to the pin named Vcc and the - to the pin named GND. Now I have 18v and
all works fine.
Thank you again.

[mauman]

Congrats!

[Wizardof_Oz]

Hi @joefox, or somebody else,
Would you mind to share the wiring instructions you mentioned for this project on Musikding? I looked all over the site and can't find it...
Cheers