[sdiy] Who apart from me things the whole MIDI board needs replacing ?

Mike Bryant mbryant at futurehorizons.com
Wed Jan 26 12:02:18 CET 2022

Good idea.  With a bit of extra circuitry you might even be able to detect which polarity to use going out to save having a setting.

From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Mattias Rickardsson
Sent: 26 January 2022 10:54
To: grant musictechnologiesgroup.com
Cc: Synth DIY
Subject: Re: [sdiy] Who apart from me things the whole MIDI board needs replacing ?

<grant at musictechnologiesgroup.com<mailto:grant at musictechnologiesgroup.com>> skrev:
Hey, it only took them a decade or so to include a messed up standard for 1/8" TRS connectors.

But the MIDI standard for TRS jacks ended up using 2.5 mm jacks, not 3.5 mm (1/8"). Just to avoid confusion. (-:

3.5 mm was already the de-facto standard by then. But half of the manufacturers ended up using one polarity and the other half chose the other, which potentially makes MIDI devices incompatible, unless special cables/adapters are at hand.

In Elektron's Model series of instruments we implemented the TRS MIDI In to accept any polarity (passively, using diodes!), and a setting in the UI chooses between the two polarities for the TRS MIDI Out. Has this been done anywhere else? I've always felt that it perhaps should be published as an official application note, a suggested implementation superpower for other manufacturers to pick up. :-)


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