Viewing 6 posts - 1 through 6 (of 6 total)
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  • #31756
    peeeeeeej
    Participant

    So I got weird with a One Knob Fuzz board:

    • 3PDTs for toggling Q1 (BC109/2N4401) and Q2 (BC108/2N3906)
    • DPDT on/on for toggling C1 (100n/1u) and C3 (220n/22n)
    • Sag circuit a’la the test kit schematic (9v > 2k resistor > B10k pot) between a 9V pad on a 3PDT board and the main board
    • R5 is a 2k potentiometer

     

    learnings:

    • R5 does not control gain lmao, I think it regulates power maybe? It seems to do a better job of sagging the circuit than my sag circuit
    • sag works fine if the R5 potentiometer is set to half or lower, but barely affects the circuit otherwise
    • toggling the cap at C1 is an idea I stole from a fuzz face DIY mod suggestion, and figured it might work since the OKF topology seems very similar, it doesn’t seem to do much.
    • same with the tight switch at C3 no significant difference

     

    otherwise this thing was cool and it was a fun experiment! Excited to rework this and make it do more of the things that I’d like!

    #31757
    peeeeeeej
    Participant

    Oh yeah, pics (forgive the bending of the socketed caps, it’s busy in there):

    #31758
    Barry
    Keymaster

    Very nice and thanks for sharing.

    I do stuff like that too.

    I have a Muff which is mostly a testing ground.

    #31761
    peeeeeeej
    Participant

    update:

    now that i’m jamming on headphones and not on a very quiet practice amp, it seems that my 2k pot wired to R5 is controlling the bias (sound seems to get very velcro-ish when i reduce it) and the sag actually works great here imo. i changed the C1 mod to be 100n/10n and the bass reduction at 10n is really nice. still can’t wrap my head around the C3 toggle, it’s as recommended in the OKF doc (220n/22n) but i can’t hear the difference. anyway this thing is badass!

    #31762
    peeeeeeej
    Participant

    oh and when i said 2N3906 earlier i meant 2N3904

    #31769
    peeeeeeej
    Participant

    final note for those following along: i replaced the 22n cap (for the C3 toggle) with a 2.2n cap and that further tightens up the bass frequency, so i would call this pedal a winner (and the R5 bias [presumably] control is a very happy accident that makes this thing super flexible).

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