New DEC museum entry :D (not the breaker sub-thread)

Jules Richardson julesrichardsonuk at
Thu Feb 22 18:06:17 CST 2007

Adrian Graham wrote:
> Well, tonight I stripped the PSU down and there aren't any filtering caps,
> at least not the X type ones I'm familiar with. Instead the mains cable
> plugs into a honking big sealed tin box that terminates in a 2 inch earth
> wire and 2 spade connectors that the live and neutral hook up to. Said earth
> wire is bolted to the chassis and joined to a similar bolt holding the fan
> to the case.
> Anyone seen something like this 'mains plug in a sealed tin box' arrangement
> before? The thing's got to be 4 or 5 inches by 2.5 inches so whatever goes
> on in there is anyone's guess.

Yeah, it'll contain class X or Y filter caps :-) Often the schematic for 
what's inside the filter is printed on its case, but this one may well have 
never had one, or it's fallen off.

It'll just be the same sort of arrangement as normally seen within a PSU, only 
in a screened casing.



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