Hey Machs where you from in Canada?
Care to share the board design that you're working on?
The general reason that we want to avoid the linear regulators is the heat and the power wastage. for 5V 5A you're wasting 35W and for 3.3V 5A you're wasting 43.5W! So for 41.5W of output you're wasting 78.5W, requiring 120W of input, giving 35% efficiency! If you then use that for the 12V rail out for 5A (at 16V input) then you're adding another 20W wastage. And if you think radiating 110W of power is *easy*, you've got something else coming to you ;P Switched regulated power supplies generate enough heat already, never mind tripling it.
If you don't care about wasting power, just go for an invertor and use a normal power supply, much much easier.
[ 11-21-2001: Message edited by: Telek ]