I would like to add that to the Spectrum but going to have to work on how to integrate into available space.
CORRECTION I am awake now...
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So that any 9V PSU, of either polarity will work, you need a bridge rectifier. Either a ready made one, or four 1N400x diodes connected up correctly.
Rubber key ZX Spectrums are tricky due to the limited space inside the case. Later models are rather easier if you don’t mind using a chassis socket and drilling a new hole in the case.
However, if you use expansions or it is a 128k or a +2 (grey), you will need diodes / bridge rectifier rated at 1.5A (48k/+) or 3A (128k / +2) or greater.
I drilled the holes in the Fuller case yesterday and was able to place the ZX81 board in the correct position and then carefully placed the paper extension template also in its correct position. The clearance looks about right now for the expansion slot comparing it with the photo of the real thing.
Thanks, I'm looking forward to having the Fuller setup.
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
Yes, that's basically what I said in my message to Paul that he's probably not had time to send them yet but I'd expect a reply a least to let me know what's happening, he's been online here.