Weird "squeal" noise with EasyFace

[Jakenaattori]

Hi all!
I've finished building my first pedal, the EasyFace at Tonepad. ( http://www.tonepad.com/project.asp?id=19 )
At first it worked perfectly and it sounded very nice. Then the next day I tried it again and it just made some weird sounding "squeal" noise.
I can "adjust" the pitch of the sound with the pregain pot and my guitars volume pot.
Could anyone help me with this problem?

[jimbob]

I had the EXACT same issue. I went over it for a while then ditched it and moved on. Good luck. It will be interesting to find out how or if you fix yours.

[petemoore]

  Assumeing the circuit board has the properties shown on the schematic.
  The transistors are a big part of the gain equation, lower Hfe's, or lower Hfe Q used in Q1 position may help.
  This Fuzz Face circuit does work without squealing, I suspect the Hfe's of the Q's chosen have a large bit to do with this, also, other component tolerances to a much lesser degree.
  other alternatives to changing transistors [tho most people report widely varying results to choose a FF sound from] include
  lowering the max resistance [max gain] of the gain pot.
  Adding resistance before the input cap...or even a pregain pot, for which there is an EZ Face schematic.
  putting a small cap between Q2's B/C
  Small cap at input
  these and numerous other ways to alter the gain may be used, and where that gain is topology wise, and frequency wise. 
  Understand that the gain of the transistors used greatly alters the gain/oscillation probabilities of the FF circuit....then if for some reason you opt to keep in there the Q's used and want to make the FF more managable by limiting gain of the circuit [basically you can swap Q's or build the circuit around the Q's to 'match' it to the Hfe's]
  Her'es what I'd start with.
  stick a 10k before the input cap
  Adjust gain pot to where you like the chosen sound, then mimic max gain setting by adding a value of fixed resistor which limits max gain to the chosen setting.
  Easiest way I know to do that is to add like a wiper and other lug of a *20k linear pot to the gain pot [gain pot maxxed], then set the gain using the paralleled *"0k-20k VR [variable resistor]" where you want it, remove the 20k, and without disturbing it's setting, measure the resistance you chose, find or make a fixed value resistor of same or close to same value [more resistance increases gain] and attach this value across the gain pot.
  ^That was a 'cursory explanation'...contents partially chosen by my ability to type them out so hopefully can be understood.
  For a better understanding of the FF, read all you can about stuff you don't yet understand about the FF, starting with GEO technology of the Fuzz Face, check AMZ's 'YAFF', ROG or Homewrecker...