Acorn A4 PSU (was Re: IBM Engineers)

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sun Apr 11 13:09:41 2004

>
> In message <m1BCRT9-000JCPC_at_p850ug1>
> ard_at_p850ug1.demon.co.uk (Tony Duell) wrote:
>
> > Right... I've actually had low-value caps go essentially open-circuit
> > before...
> Well, what do you expect them to do if the electrolyte dries out? :)
>
> > Can you cut off the screw posts and replace them with something else (say
> That's quite easy - cut most of it off with a cut-down hacksaw blade, then
> sand it down to the level of the surrounding plastic.

OK...

>
> > a hard plastic rod, with suitable holes drilled and tapped in the ends).
> Maybe. It'll be a bit of a challenge to get some plastic rod of that size

I've not seen it, so I can't know the size...

RS do some plastics, but in fairly large quantities :-(. GLR Distribution
do Nylon and PTFE in 1/4", 1/2" and 1" (I think) diameters, sold by the
foot (these might be metricated now :-().

What size do yuo need?

Actually, does it have to be plastic (i.e. does it have to be an
insulator), or you could use, say, brass rod if you connected it to mains
earth? Most model engineering suppliers sell brass rod. (Note : Model
Engineerign Supplier != model shop).


> though - not even the (fairly) well-stocked model shop has much selection in
> plastics. I've also yet to find a plastics supplier that sells direct to the
> public, too. :-/
>
> > Does it haveto br the original casing, or could you use some other box of
> > a suitable size. OK, it wouldn't be original, but...
> I suppose I could use a different case. Only problem is, I haven't seen any
> nice-looking plastic cases of the right sort of size. That and I'd need

Metal case, and connect to mains earth?

> stand-offs for the PCB - more expense.

Hmmm.. Make them youself from brass rod? I've done this when I've needed
a really odd size, or have needed odd threads (like the M3.5 jackposts
used on GPIB connectors, which seem to be unobtainable in UK catalogues!)

-tony
Received on Sun Apr 11 2004 - 13:09:41 BST