OIM Stone Face



Stone Face is a Fuzz pedal built around two PNP germanium transistors. It can be pretty aggressive for a Germanium device but cleans up when you turn down the guitar volume.

To make it more flexible I have added the following features :

  • With the Stone Face tone control, that I now have renamed to bias, you can tweak the clipping to be more or less aggressive .
  • I have also added a three way switch with the following function:
    1. No limitations
    2. Smooth
    3. Less bass


  • The pedal has true bypass when turned off.
  • Red LED indicates when the effect is on. (When LED starts to fade you have to change battery, the effect will still work though.)
  • You can use either a 9 volt battery or 9VDC power adapter (standard negative tip).
  • The design has a safety resistor so you can not damage the circuit if you accidentally try to use an adapter with the wrong polarity.

Stone Face is germanium fuzz with following features:

  • Fuzz: amount of distortion/fuzz
  • Tone(Bias): character on the fuzz
  • Vol: adjust the volume
  • Switch: three different colors of the fuzz

Suggested settings:

  • Turn the Fuzz effect fully clockwise
  • Use the tone(bias)control and the switch to adjust the character of the Fuzz effect
  • Use the volume control to adjust the out put level
  • Use the volume control on your guitar to control the amount of gain in your sound. You can go from clean to scream only using this technique.

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fx pedal stompbox stomp box guitar effects pedal fuzz distortion/fuzz/overdrive dirt grit
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