Fuzzrite build problem.

[swid]

I built a Mosrite Fuzzrite based on the dragonfly layout, and it sounds pretty awesome.  But -- when I turn down the distortion knob or turn down the volume knob on my guitar, I get a squealing, particularly when I'm not playing.  I'm guessing this is an obvious problem, but I'm not sure what causes it, or what it's called/what the solution is.  Any thoughts?

[GibsonGM]

transistor with too high a gain, maybe??  Check the resistors around the tranny to be sure the values are correct.  Really weird problem, man, lol.  Bad potentiometer or something not grounded might do that, too.
(??)

[swid]

Possibly the transistor. . .  I used 2N5089s, which are higher, to my understanding, than 2N5088s.  I'll probably try that tomorrow if nobody comes up with anything else (kind of a pain, since the layout didn't have room for sockets, so I'm gonna hold off tonight).

The other thing I noticed is that the problem goes away if I ease off the volume on the pedal.  Is this in keeping with that?

[Toney]

From memory the Dragonfly layout shows incorrect value collector resistors.
Where it shows 10ks, sub 470ks for Qs 1&2.
Should get things going... check the schem!

[Toney]

Oh squealing... right, thats most likely occillation.
Short leads! Take care with your wire runs. ..move things about see if that helps.

[brett]

Hi
In my messing with the fuzzrite, I've found that the high value collector resistors work (470k instead of 10k) better, BUT you'll need some old-fashioned, low hFE transistors.  I used 2N2222As (hFE=250), and they are totally wild.
cheers

[swid]

Thanks guys!  Changing the 10Ks to 470Ks worked perfectly.  I didn't even end up having to swap out the resistors.  I would never have realized to have done that. . .  I guess it's a lesson to look at the schematic and not just the layout.  Thanks again.