Sweet Peach Fuzz (or Big Black Box)

Posted: January 27, 2014 in Effects

I built a modified version of a Muff Fuzz with a TL072.  It has a germanium diode and LED on one side of the clip and two silicon diodes on the other side.  I added a tone control and a gain control to it and changed some values from the original.

As is is an inverting amplifier, it can have a gain of less than 1.  When the gain control is turned down past 9 o’clock, the gain is too low to amplify.  Low gain settings sputter/stutter and it’s kind of cool as an effect.

Unfortunately, the foot switch I had was non-functional, so it’s hardwired as of now.  It’s still pretty cool.  Here’s a simplified schematic:

Image

Here’s the original.

 

(Update)  The 470k bias resistors should have included a small cap to ground.  A 10pf would work with this, or you could make the resistors lower and use a slightly higher cap (100k and 68pf-100pf would set the frequency high enough for the harmonics to not be interfered with).

The omission of the cap makes the distortion crap out when the signal voltage drops below the bias voltage.  It’s cool for a gated effect, but not for a smooth, sustaining sound.  A variable cap would be cool for adding a gate control.

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Comments
  1. […] guitar I plugged in (high output and low output passives and an active).  One of these in front of The Sweet Peach Fuzz would be […]

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