[sdiy] MIDI and ESD protection

[Tom Wiltshire]

> On 6 Feb 2020, at 08:44, Julian <elfenjunge at gmx.net> wrote:
> 
> Or I should just ditch the 3.3V MIDI in favour for 5V, since the 220 Ohm
> resistors current limiting makes the design much easier!

Have you got ten fried MIDI outputs on your bench yet? How much is this actually a problem and how much is it a theoretical problem?

I wouldn't change the design to fix a problem unless I was sure I’d got a problem. The old “if it ain’t broke, don’t fix it” principle. That said, if you’re using 74HC14 for the output buffering, you could probably just run it on a 5V supply and it’d be done. I seem to remember the logic voltage levels are set up so it can convert from 3.3V input logic to 5V output.

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