Date: Thu, 16 Apr 1998 08:00:52 +1000
From: John Holden <johnh@psychvax.psych.usyd.edu.au>
Message-Id: <199804152200.IAA06424@psychvax.psych.usyd.edu.au>
To: pups@minnie.cs.adfa.oz.au
Subject: Re: PDP-11 Newbie Alert --- (gotta start somewhere)
Sender: owner-pups@minnie.cs.adfa.oz.au
Precedence: bulk


> Well, as far as I know, all of the already have switching supplies...
> Possibly not the 11/15 and 11/20, but if anyone has one of those, and
> makes such a modification, I *will* brand him as an heretic. :-)

	The 11/20 used a switch mode power supply (H720) (I still have a
functional machine!). You would have to go back to something like a PDP8/e
(got one of these two!) for a huge linear power supply. It has a huge SCR for
the overvoltage crowbar in order to dump all the energy in the filter capacitors