FreakZeq - subtle background distortion when playing clean

michaelhadley

New member
Hey all.

I built the FreakZeq (Son of Kong inspired). It "works" fine, but there is a bit of a distorted breakup subtly in the background of the amped signal/tone even when I dial down the gain on the pedal. I've tried dropping the incoming signal from the guitar to like 1 or 2 on the volume knob on the guitar, then dialed back GAIN on the pedal, and maxed the volume knob on the pedal to compensate to see if I can clean it up. Doing this, I can get it to clean up a bit, but no matter what, there is still something there.

Basically, I am getting a full clean tone at appropriate volume, but along with the clean sound is kind of like there is a carbon copy of what i'm playing also being played at LOW volume in the background.

When connected to overdrives and playing dirty, this is not noticeable at all. It "flavors" overdrives and distortions quite well. I just think it should work as a standalone allowing EQ tweaking on a totally clean guitar and clean amp? Should it not?

I also built a DIDDY (terrible name), and it does not suffer from this subtle background breakup sound bleeding through. Any ideas?

I read another thread where someone eliminated the 56p Cap (C2) (C3 in their revised scheme), to "get gain parity". Could this be the issue? Is the signal coming in a bit too hot early in the circuit? Would love to tweak this.

Thanks all!
Michael.
 
Thank you. I'm glad you started with that. I suspected the same thing. The OpAmps were
Mouser #:595-TL072IP
Mfr. #:TL072IP
Desc.:Operational Amplifiers - Op Amps Operational Amplifiers - Op Amps Dual JFET In Low N

I have some BoJack TL072s and I swapped them out.. same result. Thanks for the thought! I appreciate it.
 
I may have to build another one from scratch and have one with BoJack op amps and the other with mouser. Maybe its something else. I just don't have enough electronics experience to figure out if the sound I'm hearing is just an unwanted artifact of the schematic as designed, or if I really have an issue with a component. Pretty frustrating this one.
 
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