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

[Roman Sowa]

yes, before the resistor, otherwise it made no sense - LED or resistor 
would go poof before TVS start to conduct

Roman

W dniu 2024-06-26 o 17:00, Ingo Debus via Synth-diy pisze:
> 
> 
>> Am 26.06.2024 um 15:51 schrieb Roman Sowa via Synth-diy 
>> <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>>:
>>
>> Maybe better to use TVS across the LED
> 
> Hmm, usually there’s already a standard silicon diode (1N914 etc) 
> anti-parallel to the LED, for reverse-voltage protection. Would an 
> additional TVS do any good here? The LED or the silicon diode would 
> conduct at a much lower voltage than the TVS.
> If there’s a really nasty spike, the 220-ohms-resistor would have to 
> absorb most of its energy, no matter which of the diodes/TVS conduct. Or 
> do you mean to connect the TVS _before_ that resistor?
> 
> Ingo (remembering endless discussions with colleagues on the use of TVS 
> diodes and varistors…)
> 
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