Hello,
in everyday use is definately my 0...12VDC 30A switching supply.
Modell 1992. It is 19'' 2HE and its efficiency is better than 95%.
The Ampere instrument has two adjustable markers for an optional
under and over current logout.
Build up to supply a solid state 2m PA,
this thing is now very usefull for repairing car hifi equipment
and testing components like finding out counterfiet transistors.
regards,
Darius
PS:Schematic and pics of the inside are available of course.