I'm not sure, anyway I suppose you should try some like this:

https://www.ebay.it/itm/5V-Piezo-Sounders-Passive-Buzzer-Electronic-For-Arduino-MINI-Alarm-Speaker/192947801845?hash=item2cec95cef5%3Ag%3AguIAAOSwMs9dAKe4&LH_BIN=1

probably they are the same installed in PC motherboards

Great initiative Massimino!

The case of the 3rd from the left looks really nice (and QL-like). Did you find that online? Thank you. I found it at an electronics fair. It was an old 12V PSU. None of the PSUs in the picture is internally identical to another one. Actually I used different techiques. In one or two instances I pu...

yellowsubmarine wrote:I'm also interested in the middle PSU if it is available!

Sorry, no more PSU available. I would like to build some more, but they take a lot of time...

Well, it's far better than many other PCB cases I've seen

Great! (anyway, it was just a little joke)

janbredenbeek wrote:One of the few good things Microsoft has ever made

If it had been Sinclair-black instead of PC-white, it would have reached the perfection

Microsoft Mouse 2.0A (NOT 2.0B)

It looks as an Issue 5. On the board you can find "ISS 5" or "ISS 6" printed near the serial ports, at the right of the printed Sinclair logo. AH is one of the very first official Roms, and has several bugs. Anyway, the QL was accompained with the Psion software, so at least Abac...