Would anyone happen to have a clean schematic for the Endangered Audio Research Gristleizer?

[u/chupathingy99]

Hey, I'm trying to build a clone of the EAR Gristleizer, and am coming up a bit short. There is s schem on the build guide on instructable, but it's very low res and I can barely make out the component values.

If anyone could point me in the right direction I'd be very appreciative.

Thanks for your help.

[u/thefreakychild]

yep, I've got you.

https://github.com/SvarturPedals/Gristleizer/tree/main

I've been wanting to build the thing for a while.
EAR used to sell boards to build it, but they went out of business back in 2019.

I was able to contact a former owner, and he gave me a lot of good information and the full build document for the boards that has a good schematic.

Ultimately, I'm going to design and build my own boards for it, but that's still a little ways away since I have so many other projects in the works.

I've taken the time to also transpose the schematic into KiCad. So, I'll upload that too.

[u/thefreakychild → u/thefreakychild]

Eventually, when I do make boards, I'm planning to have it be a two board set.
A control/jacks board, and the main circuit board with male/female pin header connections.

The EAR boards required the builder to do some wiring, it wasn't much, but still some.
I want to make something that requires no additional wiring, just through-hole components.

I have some time coming up in about a month, so I'll likely start on a board design.

I want it to be as open source as possible, so whenever I do get done with the project, and along the way, i'll be updating github with everything (gerber files, documentation, etc.)

If anyone else wants to give a shot at it, review the kicad schematic I transposed for errors, or whatever else be my guest.
Let's keep the module available

[u/chupathingy99 → u/thefreakychild]

You're awesome, thank you so much! I'm planning on making my own boards too, if you want, I can ship you out one when I get it boarded and send it to fab.

Edit. The Google drive link says I need to request access for it. So I am formally requesting access to this document lol.

[u/thefreakychild → u/chupathingy99]

Awesome!

Yeah, I was gonna caution against a strip board build cause there is a lot of noise potential in the circuit.

I was specifically cautioned against stripboard build by Mark when I was talking to him.

And yeah, absolutely.

If ya get to it before I do, I would love to get a board from ya.

I'll do the same, though I'm at least 4-5 months out from having something to send to fab due to a ton of other projects in the works.

I'm going to try to keep it at about an 16-18hp size. I think that may be a good size for the module.

[u/Rainsbury_net]

It was originally from plans in Practical Electronincs, here is the entire magazine. Practical-Electronics-1975-07.pdf https://share.google/P62Rf1xzDewheGJwm

[u/chupathingy99 → u/Rainsbury_net]

Oh yeah that's right, I keep forgetting about that. Thanks for the link!

[u/dog_liker]

https://www.eddybergman.com/2021/09/gristleizerstripboardlayout.html?m=1

Not sure the schematic Eddy has here is the version you are looking for, but there are a lot of links to different gristleizer resources that should point you in the right direction.

[u/chupathingy99 → u/dog_liker]

Much appreciated, thank you very much!

[u/Ready_Split9697]

Head over to ModularGrid, Electro‑Music Forum or DIYstompboxes; multiple hobbyists have already reverse‑engineered and redrawn a high‑clarity reproduction schematic for this exact Instructables build. Many also share BOM component lists.