Combo build with Cranky Charles Squealing

[Anonymous]

Hey all,

Just built a combo pedal for a friend using a Cranky Charles PCB along with a BB Preamp clone that I got from guitar-electronics.eu

Sounds great until the controls are turned up a bit too much and I begin to get the squeal that was mentioned in the Cranky Charles build notes.

Have changed the 10k resistor (R4) mentioned in the build notes out for a 20k but the problem still persists.

Have also tried routing the wiring in a couple of different ways, still can’t quite get the squealing to go.

It is mostly when I have the controls set fairly high (particularly when I have the BB cascading into the Cranky Charles. I included an ‘easy-order switch) and so it may not really be a problem for my friend when playing but I’d still prefer to do what I can to fix it rather than giving them a pedal which doesn’t work well through the entire range of its controls

Here is a gut-shot:

 

Any help/ideas would be greatly appreciated

Cheers,

Dan

[Barry]

The problem is there is too much gain present especially when using them in tandem.

The best way to do that is to cut back on the available gain. By gain I am not meaning distortion but actual gain.

The problem is not necessarily with one circuit or the other so you will need to decide which is likely the bigger offender.

[Author]

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