[sdiy] MIDI cable impedance and MIDI In ESD protection?

[Ben Stuyts]

A 6N138 only provides 2500 V insulation between input and output. ESD can easily go higher (>= 15 kV can happen), so it might be a good idea to also put ESD protection to ground. Be sure to use low-capacitance ESD protection or you wil get nicely rounded midi data. No highs. :-)

Ben

> On 26 Jun 2024, at 10:09, Mattias Rickardsson <mr at analogue.org> wrote:
> 
> Hi,
> 
> When designing or simulating MIDI circuits, 
> is there any generally accepted model of the MIDI cable's capacitance etc?
> Would be nice to be able to make some worst-case calculations.
> 
> Also, another question touching (sic!) MIDI:    :-) 
> Now that MIDI sometimes uses TS plugs and minijacks, 
> that can be easily touched or accidentally connected to audio & CV,
> do people start to put ESD/overvoltage protection on the MIDI Input?
> If so, how - perhaps just TVS diodes across the LED,
> in order to keep the optocoupler isolated?
> 
> Curious regards,
> /mr
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org