wrote:

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With regards to the opto-coupler (mentioned by Phil),
I've added a photo of that as well (https://imgur.com/a/uBCXjwQ),
the code on the opto-coupler is:
L1620
817BL
W


** The "817" part of the number is the main identifier.

I would expect any "xx817xx" opto-coupler part on offer to work.




..... Phil