Squealing Dr. Boogey

[Sirppi]

I built the Dr. Boogey from gaussmarkov's project pdf dated December 14, 2007.
I biased the J201's to 4,5V and it sounds great except for the high squeal when not playing.

Here are the guts (messy):



Any help for the high-gain noob? 

[Talon5051]

Here is a link for a discussion on what I think you are experiencing. 

http://www.diystompboxes.com/smfforum/index.php?topic=77946.0

My first Dr. Boogey squealed real bad and putting a buffer in front fixed it. 

[geertjacobs]

In hi-gain pedals, squeal is mostly caused by feedback from signal wires being too close to each other. (output signals interfere with their own input, causing oscillation)
Try to make your wires as short as possible.
Don't run longer signal wires parallel. Try to make wires cross in 90 degree angles.

[Sirppi]

Thanks for the quick replies guys  I'll try fiddling with the wires but if that doesn't work, I might want to put a buffer in it. I tried the Boogey after a Crybaby, and it was almost dead silent. Any suggestions on a buffer circuit?

[Talon5051]

Here are a bunch of buffers:  http://www.muzique.com/lab/buffers.htm

[deadastronaut]

never had this problem with any of my boogies...

i always use shielded wiring on the input.....

[Scruffie]

I'd adjust the voltages by ear, not just to 4.5V, that's more of a benchmark (That can be wayyy off) and that's probably your problem.

[El Heisenberg]

Yup, what scruffie said. Take an audio probe and listen after each JFET and adjust each stage seperately.

[Sirppi]

I shall do that right after i get home  thanks for the help guys!

[Sirppi]

Something weird happened, i put this buffer

before the boogey, in an other enclosure it works perfectly but when i put the buffer inside the boogey i only get very low-gain low-output sound.
What could be wrong with it?