Date   : Fri, 09 Oct 2009 01:09:06 +0100
From   : dominic@... (Dominic Beesley)
Subject: Power Supply Capacitors

One may well have to stand higher ripple currents and hence get hotter.

Is there a reason for the refurb? I've found these PSUs to be surprisingly
reliable, compared to modern ones!

Dom



-----Original Message-----
From: bbc-micro-bounces+dominic=brahms.demon.co.uk@...
[mailto:bbc-micro-bounces+dominic=brahms.demon.co.uk@...] On
Behalf Of Darren Grant
Sent: 09 October 2009 00:53
To: BBC MailList
Subject: [BBC-Micro] Power Supply Capacitors

Decided to do a complete refurb of a master PSU tonight.

Raised a couple of questions...

Anyone have any idea why everything is glued together with hot glue ? The
only thing likely to vibrate would be the inductors so I was kind of
surprised to see all of the electrolytic capacitors glued together.

I am replacing all electrolytics and apart from the obvious voltage,
temperature, and ESR values are there any other differences in the type of
capacitors used that should be considered when replacing them. For example
C12 is 25v 220mF but is big orange can in comparison to C13 that is also 25v
220mF is a tiny black can. Is there some reason for this difference that I
am missing?

I'm not that well up on switch mode power supplies.

Darren





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