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

Sean Ellis tensiontype at hotmail.com
Thu Jan 27 11:36:36 CET 2022


As an aside, with the circuit posted below could that midi input also be used for a gate input with correct protection? Seems like the diodes will do the job as long as it's a mono cable into stereo jack.

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Roman Sowa <modular at go2.pl>
Sent: Thursday, 27 January 2022 10:49 AM
To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Who apart from me things the whole MIDI board needs replacing ?

There are also optocouplers with dual LEDs in reverse, so polarity
doesn't matter without hassle of adding diodes. For example APCL214,
which I've used in my MIDI2CV converters. Not only it provided
mistake-free wiring, but was also smaller than typical SOP5 optocoupler.

Roman

W dniu 2022-01-26 o 20:04, Sean Ellis via Synth-diy pisze:
> Quite a few modules do it:
> https://raw.githubusercontent.com/jakplugg/Neutron-Sound-Dust-of-Time/master/schematic.pdf
> <https://raw.githubusercontent.com/jakplugg/Neutron-Sound-Dust-of-Time/master/schematic.pdf>
>
>
> ------------------------------------------------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Quincas
> Moreira via Synth-diy <synth-diy at synth-diy.org>
> *Sent:* Wednesday, 26 January 2022 3:11 PM
> *To:* Mattias Rickardsson <mr at analogue.org>
> *Cc:* Synth DIY <synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] Who apart from me things the whole MIDI board
> needs replacing ?
> Matias, the Tukra by Tesseract does the same. Works with both standards
> for the input and has selectable output.
> I appreciate the nostalgic love for Din connectors but they seriously
> limit the size and shape of the devices. I like how things are skinny
> these days… And yes, while the standard chose a smaller barrel, this was
> indeed done too late when already all manufacturers are using 3.5mm.
> They should have stuck to that and just chosen one polarity to be the
> standard  IMO.
> BTW I’ve been using 3.5mm trs MIDI for nearly a decade myself and have
> never encountered a ground loop issue.
>
> On Wed 26 Jan 2022 at 4:57 Mattias Rickardsson <mr at analogue.org
> <mailto:mr at analogue.org>> wrote:
>
>     <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. :-)
>
>     /mr
>
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