Do I need an optocoupler when adding a MIDI DIN breakout?

Hi @nsm

Let me say first thank you for the offer to investigate. I don’t want to cause you any stress however, I am in no position to demand anything from you so please don’t worry too much about it.
Here are the links to the breakout-board. I imagine that the shipping from UK to USA will be costly and slow :frowning:

https://www.hobbytronics.co.uk/midi-breakout?keyword=midi%20breakout%20board
https://forum.zrna.org/uploads/default/original/1X/1dd1968d02d514c0aefacc9d7a597665182fe230.jpeg

I just tested and confirmed my personal workaround for receiving midi clock without a computer.
Despite having it mentioned months ago in this thread, I never actually tried and forgot about it.
I have a USB-midi controller with built-in DIN jacks (even with a through port). It is the Novation Zero SL MK2. It does work (needs an external power adapter though).