Differential Overdrive Help...

[pooshumpwa]

I just started to get into making stompboxes, and I chose the Differential Distortion for my first project.  I made it, and it sounds great, but for some reason the output is extremely low volume.  Any ideas what could be causing the low volume?  My model is exactly the same as the schematic, except I used a 6.6k resistor to the ground instead of a 6.2k.  I didn't think that this would decrease the volume, but any ideas?  Anyone else have a similar problem?

[pooshumpwa]

Here's the schematic if it can help.  I really like the sound it makes, but its so quiet its almost useless the way it is.

http://www.muzique.com/schem/diffuzz.gif

[petemoore]

That uses NPN and PNP"s, the two 2n3906's are "Emitter Up', the arrows in the circles designate the PNP and PS direction.
 The 5088 npn is a sort of common gain stage, higher input resistors than LPB.

[squidsquad]

I think I shorted out that 6.2k....got more fuzz...then tacked on a Fetzer drive to the end &got one LOUD mother.  I also have a 3 way input cap switch...can get trebely fuzz lite.....normal....and fat/compressed sustain.  Luv it!

[pooshumpwa]

Thanks for the help, I think im definately gonna put a booster stage in at the end to get it up to volume.  What different input caps did you use to get the different fuzzes?  That sounds like a real neat idea.

[pooshumpwa]

One more thing, I read somewhere that if you change the resistor at the emitters of the 2N3906s from 100k to 10k that it will give a decent volume boost.  I tried a 3.3k in place, but it blew both of the transistors. Luckily, they came in a 10 pack so ill have a few tries.

[squidsquad]

I used a double pole 3 way toggle switch (center=off).  Ran the input into the left side center pole...output on the right...w/a .0012 across them (treble=center position).  Across the bottom R & L poles is a .0022...which will add to the first when the switch is up(normal fuzz).  Across the top poles is a .018 ( it will add to the center w/switch down=FAT).  Of course,  these may be adjusted for your taste.  My values seem awfull small...but it's what worked for my unit. I also added almost .02 cap to ground before the output pot to reduce high end hash.