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

[Roman Sowa]

200pF/m will give you good insight of what might happen in the most 
random and unsuitable cables people might try to use.

I haven't seen any optocoupler's LED damage yet, but surprisingly the 
resistor damage - yes. The 220 ohm one that goes from +5V to pin 4. 
Someone connected some live voltage there accidentaly and it went poof.

Roman

W dniu 2024-06-26 o 10:09, Mattias Rickardsson pisze:
> 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
> 
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