Re: [CAD_CAM_EDM_DRO] Isolation Transformer

Joe Vicars wrote:

> I have 2, 5KVA Extreme Isolation Transformers. What are they
> used
> for and what are they worth? Each weighs about 75 lbs. One is a
> Xentek
> and one is a Topaz.

Used for isolating sensitive electronic gear from noisy power lines.

> Also have 2 QSI switching power supplies. Set at 5v, 200 amps.
> What the hell is 200 amps at 5 volts used for?

Powering digital logic in computers. 200 Amps would be for a large
computer,
but it wasn't too long ago that mid-size machines (VAXes, HP, etc.) used
power
supplies of this size.

> What is a switching power supply and why would I want one? I have
>
> several.

It uses a pulse width modulation scheme to achieve regulation with
minimal losses.
A linear power supply regulated by dissipating the difference between
the unregulated
source and the regulated output. If the unregulated input was 10V, then
a 200A 5V
linear supply would dissipate 1000 W as waste heat when producing 1000 W
to the
load, for 50% efficiency.

Jon