MOSFET Pie

[almondcity]

Modified from the available MOSFET Pie 2 schematic and modified for BS250s because someone on the internet said they were quieter than BS170 and everything on the internet is true so I had to try it. This one is cool, it doesn't have the woofiness of a regular big muff. Nice on bass it would seem. Mine's fairly quiet.

 

[Feral Feline]

So you're running the P-channel MOSFETs on your own board?

 

[almondcity]

So you're running the P-channel MOSFETs on your own board?

That's correct

 

[mckillacuddy]

someone on the internet said they were quieter than BS170…

Ooh. I member that schematic. From way back. Joe Davisson? SoulSonic, Maybe?

 

[almondcity]

Ooh. I member that schematic. From way back. Joe Davisson? SoulSonic, Maybe?

It was one of those other forums, diystompboxes maybe

 

[Feral Feline]

The schematic over at Effects Layouts was from "Anders", who's behind DirtBox Layouts and FuzzheadFX.

Circuit designs - Mosfet Pie

Mosfet Pie. Inspired by Skreddy Top Fuel and a DIY muff project One Knob Gilmour I have been tinkering with a big muff circuit using mosfet transistors for all four gain stages along with mosfets wired...

guitar-fx-layouts.238.s1.nabble.com

Moonn has a PCB for it.

Version 1 compared to version 2 has some neat tweaks; V2 swaps out the first set of clipping diodes from LED to 1N4001, the feedback caps are increased and there's only one clipping cap which is on the 1N4001s in the first stage while the MOSFET clippers in the second stage have no filter cap at all.

I never bothered to take notice of the differences between V1 & V2 'til this build report. Now I'm intrigued.

 

[almondcity]

 

[almondcity]

Definitely not my favorite big muff but certainly a different flavor

 

[mckillacuddy]

It was one of those other forums, diystompboxes maybe

That’s it. Mosfet polarity noise in Joe Davisson’s Obsidian at Analog Alchemy, ala diystompboxes: https://www.diystompboxes.com/analogalchemy/sch/obsidian.html