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

Mike Bryant mbryant at futurehorizons.com
Wed Jan 26 12:50:50 CET 2022


I don't see why not.  Just have two drivers capable of positive and negative output with current limiters and a voltage measurement.  Try both.  Either 0.7V or 5V is the wrong way around, 2-3V is the correct way.

-----Original Message-----
From: Vladimir Pantelic [mailto:vladoman at gmail.com] 
Sent: 26 January 2022 11:09
To: Mike Bryant
Subject: Re: [sdiy] Who apart from me things the whole MIDI board needs replacing ?

yes, but does not help if the user picks a random dongle or uses a TRS cable to go into the next module with unknown polarity...

so you always need a setting and the module has very little UI for that, thus we opted for the "silk screen" setting :)


On 26.01.22 12:02, Mike Bryant wrote:
> 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. :-)
> 
>  
> 
> /mr
> 
>  
> 
> 
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