Given I've done a few Sunn Model T layouts recently, I thought the next obvious step would be an Earthquaker Devices Life pedal layout. This is from the PedalPCB Parentheses Fuzz schematic, which has an additional clipping mode on a rotary switch. I'm sure you can work out how to drop it back to a standard ON-OFF-ON switch if you prefer something simpler, and this will take up much less space than a rotary in an enclosure.
It is of course a Blue Ringer with a buffered blend > Rat > Mosfet booster (Magnitude). I did a layout for just the octaver section a while back if you just wanted to build this on its own and drop it in front of your favourite fuzz / distortion.
EARTHQUAKER DEVICES LIFE PEDAL - VERO LAYOUT
EARTHQUAKER DEVICES LIFE - SUGGESTED MODS
I read this in the comments section of the Life Pedal layout over on the very fine Effects Layouts site. Both mods attributed to Mark Hammer in the comments - so they may be worth some thought.
Direct quotes below;
The basic Green Ringer circuit works better with a little more "push" as the front end. That can be provided by running a resistor/cap combination in parallel with the 2k2 resistor labelled R8. Consider use of a 1k resistor and 10uf electrolytic cap, negative side going to ground.
I'll also add that, since the octaver input stage doubles the frequency of everything, it's not clear why the Rat section really needs the R18/C12 network to goose the gain of content above 1500hz. Users may find less need to be brutal with the Filter control if they either omitted that RC network or perhaps replaced it with 330R and 1uf. That would provide proportionately more gain for content above around 500hz instead of the searing gain for higher-frequency content that a stock Rat provides.
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