SOLVED Phase II Signal problem

[mikhapa]

Hi all!

I've just finished the beautiful Phase II pedalPCB build, and it works awesome!
However, I've noticed that the pedal has an impact on my guitar tone: makes it a bit weaker and slightly reduces high freqencies.

That happens both in (true) bypass and with effect ON. If I put a pedal with a buffer (Boss GE7 in my case) before Phase, the problem goes away and I have a nice and crisp tone both bypassed and effected.


Any ideas on where is the mistake could be? I suppose it shouldn't suck tone at least in true bypass!

Thanks a lot
- Mikhail

 

[Robert]

If bypass is affected you'll want to look at the offboard wiring and footswitch.

 

[mikhapa]

If bypass is affected you'll want to look at the offboard wiring and footswitch.

That's wierd, I've tried to rewire it straight In to Out like this (no switch, no PCB), and I'm still getting this slight Lowpass filtering. I've made a small sample of routing a signal through a bypass looper with the pedal in the loop, switching it on and off the loop.

 

[Coda]

How do you have the input jack wired?

 

[mikhapa]

How do you have the input jack wired?

Big black screened cable is for input (screen is on the IN jack ground), and the yellow cable goes to pcb ground.

 

[Chuck D. Bones]

You don't need coax cable in this pedal. Coax cable has capacitance that will load the guitar. Different coax has different capacitance. I wouldn't think such a short length would have an effect, but I can't think of any other cause if the pedal is wired correctly. Try replacing the coax with a straight wired and see if that fixes it. Also, clean all of the flux residue off of the board. What's with the black tape?

 

[mikhapa]

You don't need coax cable in this pedal. Coax cable has capacitance that will load the guitar. Different coax has different capacitance. I wouldn't think such a short length would have an effect, but I can't think of any other cause if the pedal is wired correctly. Try replacing the coax with a straight wired and see if that fixes it. Also, clean all of the flux residue off of the board. What's with the black tape?

Thanks for the response!

I used the screened audio cable for input in this build to get rid of LFO clicking noise. Otherwise (with a regular wire), it was very loud and audible even in bypass. However, the other end of the screen is not wired anywhere, that's why I used the black tape.

Actually, I just resoldered all the off-board wiring and the initial problem went away. Thank you all for help!

 

[MichaelW]

Thanks for the response!

I used the screened audio cable for input in this build to get rid of LFO clicking noise. Otherwise (with a regular wire), it was very loud and audible even in bypass. However, the other end of the screen is not wired anywhere, that's why I used the black tape.

Actually, I just resoldered all the off-board wiring and the initial problem went away. Thank you all for help!

@mikhapa
Glad you got it worked out...awesome that it was some simple!

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