Per Jessen said the following on 09/14/2010 03:29 PM:
Anton Aylward wrote:
I don't know about heavy, though. Back in the mid 70s I needed a 50W PSU for a piece of avionics I was working on. I pulled the catalogues and built a custom switched mode PSU that fitted in one of those kitchen-size matchboxes[1]. The toroidal transformer - OTS - was about as big as my thumb. The 'trick' was running it at high frequency.
Switch-mode - some 25 years ago I had a PDP11-04 in my workshop - no switch-mode in that thing. Lots of heavy copper windings on the enormous transformers.
Another reason they put the PSU at the bottom of the rack! How much computing power was in the -04? More than in my cell phone? -- Most good crime on this planet involves insiders. -- Bruce Schneier -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org