This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Friday, October 28, 2016

Smallsound/Bigsound Team Awesome! Fuzz Machine

For Fuzz Friday here's another cool design from Brian at Smallsound/Bigsound. It's a unique silicon/germanium hybrid fuzz box with all kinds of options. This was traced over on Freestompboxes and Brian was kind enough to chime in and shed a little light on the circuit. There have been a couple versions of this circuit with both PNP germaniums with a charge pump and this version with NPN germaniums. The dip switch is there to give the option of bypassing the input buffer. For the buffer to be on, switch 1 down and 2 and 3 up. To bypass the buffer, switch 1 up and 2 and 3 down. There are a couple question marks around the circuit still, specifically 2 diodes (which are probably schottkys) and one larger capacitor (probably 330nF), so socket things and experiment. It seems to be a very tweakable circuit, and it work well on guitar and bass.

 


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16 comments:

  1. UnknownOctober 28, 2016 at 12:47 PM

    any sub for q6 - q7 ??

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  2. plushNovember 3, 2016 at 9:53 AM

    I've obtained a couple hundreds of MP35 somehow, hope to verify it this weekend.

    Cheers

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  3. johnkNovember 12, 2016 at 2:42 PM

    I just finished build this one and also own the original so this one is VERIFIED!

    ReplyDelete
  4. Andrew FoxFebruary 9, 2017 at 7:58 PM

    I was reading in other forums that if you even can't find BAT41's in your location you can replace them with Any Germanium diode. Any Silicon Schottky diode (eg. 5817)
    Replace 2x BAT41 with one std. silicon diode, zener would be ok.

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  5. UnknownJanuary 5, 2018 at 6:10 AM

    DIP switch is this necessary?

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  6. UnknownJanuary 7, 2018 at 6:57 PM

    if dip 1 is up and 2 and 3 down, the buffer is active, right? So if I put a jump in dip1 the buffer will always be active?

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  7. UnknownJanuary 19, 2020 at 2:54 AM

    hi! i have a strong feedback when i turn the clean pot at full range, can't find the sourse of problem

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  8. o.ç.November 7, 2021 at 9:56 AM

    any kind of npn silicon transistors work pretty well on q6-7. try bc108, 2n3904, 2n2222 they all sound good. verified

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  9. BAUMFebruary 28, 2024 at 6:05 PM

    Sorry to ask a dumb question: I've scoured a fair amount of forum posts, reviewed your General Layout Notes, and even tried to understand what other folks did from the diystompbox post that some of this came from, all to minimal success; how are the two footswitches wired to both have independent LEDs and to have one toggle the fuzz effect while the other toggles gating? Thanks in advance for any help!

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