Thomas Organ Cry Baby Wah DC Power Issue

[ilponiz]

hi evryone,

i was planning to add a 9v dc jack (boss style) to my vintage Thomas Organ Cry Baby Wah.
I tried several grounding connections but i always had a big hum when the effect was on.
I modded the pedal to true bypass using this wiring scheme:


here's a big pic of my last attemp



basically i grounded the input and the pot lug to the output sleeve and connected it to the ground pad on the board. i connected the ground from the dc power to the same ground pad on the board...still a humming wah

any help?
cheers


poniz

[doug deeper]

you need some power supply filtering, or if its going to be on a pedalboard powered my a daisy chain your other pedals will solve the problem.
(ive done the same thing to my thomas organ wah and can relate to the massive HUMMMMMMMMM!)

[ilponiz]

hi doug and thanks for the info.
however, i still think the problem is related to the ground connections.
is there a better/suggested way to add an external dc power to an old vintage wah?


cheers
poniz