DIY 3.5mm TRS MIDI breakout for Expert Sleepers

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elisha_gray
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DIY 3.5mm TRS MIDI breakout for Expert Sleepers

Post by elisha_gray » Tue Jan 22, 2019 6:02 pm

Homemade Hack™
Quad Midi Jacks module

Image
Disting Mk4 cabled to two of the Quad MIDI Jacks


I have two Expert Sleepers modules that have MIDI headers. I read a suggestion from Os that a homemade breakout module would be straightforward to build.

I wanted to keep it small, so I used 3.5mm TRS connectors instead of 5-pin MIDI connectors. My homemade module has four jacks in 1U x 8hp.

It turns out there is a standard for 3.5mm TRS MIDI, but the standard didn't happen until after several different companies had several different pin-outs. I chose what I believe is the MMA standard, with MIDI pin 5 to tip, and MIDI pin 4 to ring. Korg and others use this wiring.

Each General CV and Disting Mk4 module has one four-pin MIDI header:
  • - Header pin 1 is MIDI out pin 4 (Quad MIDI Jacks gray wire to TRS out ring)
    - Header pin 2 is MIDI out pin 5 (Quad MIDI Jacks blue wire to TRS out tip)
    - Header pin 3 is MIDI in pin 5 (Quad MIDI Jacks yellow wire to TRS in tip)
    - Header pin 4 is MIDI in pin 4 (Quad MIDI Jacks red wire to TRS in ring)
Parts list:
  • - Intellijel 1U x 8hp blank cover
    - Tensility 54-00081 panel-mount female 3.5mm TRS jack, solder connectors (qty 4)
    - Samtec IDSD-04-D-10.00 eight-conductor ribbon cable with 4x2 header, 10" (25 cm) long (qty 2)
    - Rapco Horizon MIDI-MINI 3.5mm TRS to 5-pin MIDI cable, 15' (4.5m) long
    - Rapco Horizon MIDI-MINI-6 3.5mm TRS to 5-pin MIDI cable, 6' (1.8m) long
I also made an Arturia-to-MMA cable that handles the 3.5mm TS (not TRS) wiring on my Beatstep. Standards are wonderful things...

Image
MIDI header on General CV

Image
Rapco Horizon TRS-to-MIDI cable
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os
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Post by os » Wed Jan 23, 2019 3:40 am

:party:

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soon_come
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Post by soon_come » Wed Oct 23, 2019 9:35 pm

Love this. I’m thinking about a 0hp solution myself.

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soon_come
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Post by soon_come » Sat Nov 02, 2019 12:40 pm

Os, would something like this work fine for a DIY expander if I wire the pins to 3.5mm TRS connectors?

Uxcell 4 Pin 4 Way 24AWG Female IDC Flat Ribbon Cable 2.54 mm Pitch 20 cm 5 Pieces

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os
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Post by os » Sun Nov 03, 2019 4:22 am

Should be fine.

seta666
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Re: DIY 3.5mm TRS MIDI breakout for Expert Sleepers

Post by seta666 » Tue Mar 10, 2020 12:46 pm

Can you share the wiring diagram? I would like to something similar in the plate holding my korg sq1...lots of free space in there.

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