This is a byproduct of MidiALF/CV project: I was testing the fab’s ability to handle plated slots and ended up with what looks like a pretty useful tool to convert 1/4″ cables to 3.5mm and back. Instead of maintaining a bunch of mixed jack conversion cables it’s now possible to just run regular ones through this tool.
Eagle files: jack-o-mix.v0.1
BOM:
6 x 1/4” Neutrik NRJ4HF Mouser #550-10284
6 x 3.5mm Switchcraft 35RAPC2AV Mouser #502-35RAPC2AV, Digikey #SC1457-ND
IMPORTANT: 1/4″ jacks MUST be soldered on the silkscreen side!
Production Jack-o-mix pcbs:
To order Jack-o-mix PCB, please send an email to pete at kvitek c o m specifying how many PCBs you need and a country where to ship them, and I’ll send you a PayPal invoice.
1 x Jack-o-mix PCB is $15
6 x 3.5mm Switchcraft 35RAPC2AV is $5
Shipping to the US is $5, Canada $7, elsewhere $15.
Eurorack panels by Grayscale are available here. Jackomix Euro panel drawing.
MidiSizer 
THAT’ GREAT,
COUNT 1 FOR NEXT SET 2 SEND WHEN I ORDER THE CV EXTENSION, PLEAZE.
GREETZ
SIMON
I would be interested in one with my CV extension. Thank you.
Yes, two Jack-o-mix boards to go with the CV extension please.
please count me in for 2 boards! thanks!
(rosch)
Taking 4 please
Pete,
I’ll take one, and if its all the same to you I will get it at the same time as a CV board. Thanks!
Count me in for 2, please. Thanks!
We had contact via email, my order is on-hold awaiting CV board. If possible I’d like to add 4 of these. Question: why not have 8 socket pairs?
8 socket pairs will make it too long to fit into Eurorack format.
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Sorry for my silliness but I still can not wrap my head around and visualize how this can be used with CV extension or is it supposed to be just used in a eurorack case ?
If you have mixed modular environment: Euro and MOTM, or just want to interface Anushri to MOTM, you have to keep around a bunch of 3.5mm to 1/4″ cables. With Jack-o-mix you can just use regular 3.5mm and 1/4″ cables you already have and connect them through Jack-o-mix.
Can you make the same for rack, but with 1/4 on rear panel?
Front – 16 х 3,5 TS (mono)
Rear – 16 x 1/4 TS (mono)
How much?
Sorry, no, i’m not doing custom projects. Eagle files are published, so you can DIY.
Great tool, does it exist with MU/5U panel?
Nope. GrayScale has a Eur panel.
I would like 2 pcs.
Please contact me at pete (at) kvitek (dot) com