Need to do some filtering at the DC jack and Im stuck

[selfdestroyer]

I built a Monolith tonight and its a CRAZY beast and its been fun to play but I get some loud squealing from it with different know configs.. I was looking on Tagboards since I used Marks layout and another builder had the same issue. He said it would work fine with a 9V bat but on his 1Spot it would squeal. He said this "Used 220uf + a 220R soldered to the dc jack are wonderful, quiet pedal now." and I am not 100% sure how to do this. Does it bridge the positive and negative? Is it in line on one of them? I have seen pedals before with caps on the DC jack but of course now that I need to see one I cant find a picture or info anywhere. Can someone push me in the right direction?

Layout I used: http://tagboardeffects.blogspot.com/2013/06/mountainking-electronics-megalith.html

Thanks
Cody 

edit:
I missed this "I replaced the 47uf cap from +9v to ground with a 220uf one. Te 220r resistor was soldered to the +9v lug of the dc jack, ans from there to the wire that connects to the +9v row in the pcb."

I will try this.

[selfdestroyer]

Solved..

http://www.olcircuits.com/documents/olc_powerfiltering_guide.pdf

This doc helped a lot.

[TNblueshawk]

I wish I could print that thing.

[kothoma]

I wish I could print that thing.

Huh?

[TNblueshawk]

When I click on his link to the OLC filtering there is a no print lock on it. I saved as a PDF and I still can't print it. I'm at work but I don't think it is a work filtering thing.

[kothoma]

Ah yes, you're right, printing was restricted by the creator.

Thanks to http://www.pdfunlock.com/ here is:

[kothoma]

Is it printable now?

[TNblueshawk]

Yep, it sure did. Thanks for unlocking it.