On Aug 20, 10:30*pm, "Steven Campbell" wrote:
"Steve S (another one)" wrote in ...
Makes you wonder why they needed a 5V regulator inside and they couldn't
just supply a 5V power supply.

They probably had a good deal on 12v supplies -- the 5v regulator
inside would cost only a few pence, whereas they could save a lot by
ordering tens of thousands of 12v supplies rather than a more limited
number of 12v and 5v and who knows what else in between. Makes sense
to standardise on the highest voltage required by any of the line of
items which might require a smallish power supply.