Saturday, 25 July 2020

God City Instruments Uno Fuzz

There is two layouts of this one, one stock with one control. Since it begs for modifications I added a second layout with four pots for more control:

  • 100K resistor at the output is replaced with a 100k volume control.
  • 33k/68k before Q2 is part of a fixed Big Muff style tonestack so they are replaced by a tone control.
  • The tonestack itself has a very deep and quite narrow mid scoop so a Shape pot is added to blend in some more mids via 27nF cap. 
Stock layout 

 

...and four knob layout.



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3 comments:

  1. Convergent Sound4 September 2020 at 03:21

    Has the quattro version been verified? I built it up today and everything works great accept the fuzz control which acts like a second vol control. Just checking to see if it was my build that needs to be rechecked.

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    1. fuzzhead4 September 2020 at 05:18

      Yes, the "quattro" version is verified. As you says, the fuzz control is not very good one, by looking at the schematic it is wired in a quite an odd way. It both affect bias, gain and volume. For future build I woy hardwire it with a internal resistor.uld probabl

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    2. Convergent Sound4 September 2020 at 12:37

      Cool, I'll prob go the trimmer route if I get around to casing it. The adjustable tone stack you added has a very wide adjustable range!

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