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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.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Roman Sowa <modular@go2.pl><br>
<b>Sent:</b> Thursday, 27 January 2022 10:49 AM<br>
<b>To:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Who apart from me things the whole MIDI board needs replacing ?</font>
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<div class="PlainText">There are also optocouplers with dual LEDs in reverse, so polarity
<br>
doesn't matter without hassle of adding diodes. For example APCL214, <br>
which I've used in my MIDI2CV converters. Not only it provided <br>
mistake-free wiring, but was also smaller than typical SOP5 optocoupler.<br>
<br>
Roman<br>
<br>
W dniu 2022-01-26 o 20:04, Sean Ellis via Synth-diy pisze:<br>
> Quite a few modules do it:<br>
> <a href="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</a>
<br>
> <<a href="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</a>><br>
> <br>
> <br>
> ------------------------------------------------------------------------<br>
> *From:* Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Quincas <br>
> Moreira via Synth-diy <synth-diy@synth-diy.org><br>
> *Sent:* Wednesday, 26 January 2022 3:11 PM<br>
> *To:* Mattias Rickardsson <mr@analogue.org><br>
> *Cc:* Synth DIY <synth-diy@synth-diy.org><br>
> *Subject:* Re: [sdiy] Who apart from me things the whole MIDI board <br>
> needs replacing ?<br>
> Matias, the Tukra by Tesseract does the same. Works with both standards <br>
> for the input and has selectable output.<br>
> I appreciate the nostalgic love for Din connectors but they seriously <br>
> limit the size and shape of the devices. I like how things are skinny <br>
> these days… And yes, while the standard chose a smaller barrel, this was <br>
> indeed done too late when already all manufacturers are using 3.5mm. <br>
> They should have stuck to that and just chosen one polarity to be the <br>
> standard IMO.<br>
> BTW I’ve been using 3.5mm trs MIDI for nearly a decade myself and have <br>
> never encountered a ground loop issue.<br>
> <br>
> On Wed 26 Jan 2022 at 4:57 Mattias Rickardsson <mr@analogue.org <br>
> <<a href="mailto:mr@analogue.org">mailto:mr@analogue.org</a>>> wrote:<br>
> <br>
> <grant@musictechnologiesgroup.com<br>
> <<a href="mailto:grant@musictechnologiesgroup.com">mailto:grant@musictechnologiesgroup.com</a>>> skrev:<br>
> <br>
> Hey, it only took them a decade or so to include a messed up<br>
> standard for 1/8" TRS connectors.<br>
> <br>
> <br>
> But the MIDI standard for TRS jacks ended up using 2.5 mm jacks, not<br>
> 3.5 mm (1/8"). Just to avoid confusion. (-:<br>
> <br>
> 3.5 mm was already the de-facto standard by then. But half of the<br>
> manufacturers ended up using one polarity and the other half chose<br>
> the other, which potentially makes MIDI devices incompatible, unless<br>
> special cables/adapters are at hand.<br>
> <br>
> In Elektron's Model series of instruments we implemented the TRS<br>
> MIDI In to accept any polarity (passively, using diodes!), and a<br>
> setting in the UI chooses between the two polarities for the TRS<br>
> MIDI Out. Has this been done anywhere else? I've always felt that it<br>
> perhaps should be published as an official application note, a<br>
> suggested implementation superpower for other manufacturers to pick<br>
> up. :-)<br>
> <br>
> /mr<br>
> <br>
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> -- <br>
> QMA <br>
> Quincas Moreira<br>
> Director | QMA<br>
> mobile: 5534988825 <tel:5534988825><br>
> site: quincasmoreira.com <<a href="http://quincasmoreira.com/">http://quincasmoreira.com/</a>><br>
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