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

Roman Sowa modular at go2.pl
Thu Jan 27 10:59:47 CET 2022

Max 2m on twisted pair sounds like it's 10Gbps transmission. ;)
Couple of years ago I've made a test with 200m cable (non twisted, 
non-shielded 4-wire control cable) running MIDI, and apart from delay 
and one small reflection step I couldn't find any issues. The waveform 
was still much steppier than what an optocoupler does with this.


W dniu 2022-01-26 o 20:38, Mattias Rickardsson pisze:
> "Details:
> (1) Pin-out Correspondence:
> The following TRS to DIN drawing illustrates the wiring for a female TRS 
> connector in comparison to a
> female MIDI-DIN connector (it is expected that devices will use female 
> TRS connectors).
> Notes:
> The MIDI In/Out circuitry should be implemented in accordance with the 
> MIDI 1.0 Electrical
> Specification Update [2014] (MMA/AMEI CA-033).
> Because TRS connectors are often used for other (non-MIDI) purposes, 
> manufacturers are strongly
> advised to add protection circuitry (e.g. to handle the case when a 
> DC-coupled headphone driver is
> connected to a MIDI output).
> (2) Connector Size:
> 2.5mm TRS connectors are recommended.
> Note: If any other connector size is used, the remainder of this 
> specification still applies.
> (3) Cables
> All cables shall use shielded twisted pairs, as defined for a MIDI cable.
> The following drawing shows how to implement a male TRS to female 
> MIDI-DIN adapter cable:
> Notes:
> Adapter cables shall have a maximum length of 2 meters.
> Direct connection between two TRS-equipped devices using cables designed 
> for use with audio
> equipment is not acceptable because the wires are not twisted pair and 
> are typically individually
> shielded."
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