Twenty-Two Sevenths

by gaussmarkov

22-7ths Layout

Another classic pedal (the Big Muff Pi) reinterpreted with a CD4049UBE by This is a work-in-progress. This version is a combination of revisions 1.2 and 1.3.

The schematic source is

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2 Responses to “Twenty-Two Sevenths”

  1. RangeLifer said:


    I’ve built this one and it sounds great! However, it’s quite noisy, lots of buzz & humming. Did I make some misstake or is this the way this circuit behaves? I used an etched PCB for it.

    Best regards

    Posted 31.03.2009 at 5:34 am

  2. koshnoika said:

    i also built this and found that it was the total opposite its dynamically excellent especially through a jcm800 emulator. using an etched pcb won’t be any problem, hold up… where’s mr gaussmarkov….he’ll tell ya..c ya…im back off to polski…

    Posted 28.04.2009 at 8:46 pm