Klon centaur clone

[ward]

Hi,

My centaur klon is giving me headaches,
the pedal is working, the pots are working as should.  Only the gainpot has some scratchiness.

But the big problem is a squeal or oscillation at around 4khz.

This is the layout I used,
http://effectslayouts.blogspot.be/2016/01/klon-centaur.html?m=1
This is my reference schematic,
https://aionelectronics.com/wp-content/uploads/2013/11/klon-centaur-schematic.png

I didn't use any switching scheme.  The pedal is to be controlled with a switcher.  So the output comes directly  from the wiper of the volume pot.

[antonis]

Replace Gain pot, as a start...
(the way the pot is connected may result in oscillation in case of pot set in "scratchy" area..)

[EBK]

I know I read something a long time ago about adding a cap somewhere to take care of whine due to instability.....  I'm still trying to find it.

[bluebunny]

So you're looking for the whine list, Eric? 

I'll get my coat... 

[ward]

Its solved....

I replaced the ICL7660SCPA and away it went ...
A bad chip I suppose