[sdiy] Switching power supply transformers

[David Cornutt]

On Jan 12, 2005, at 3:10 PM, Karl Ekdahl wrote:

> The other thing i
> was thinking is that maybe if i'm driving only the
> logic part of the circuit with this, i could keep the
> supply as it is?

I've successfully used 5V switchers with my modular.  As you
surmise, the 5V supply is generally used in modular circuitry
to drive digital logic or other noise-making components like LEDs,
so in this case a little noise from the supply doesn't hurt anything.
I can't swear that you will never have a problem with it, but I haven't
run into any problems so far.

Also, you are unlikely to be able to re-use the transformer
in a linear... it's sized for the switching clock rate of the
supply, which is quite a bit higher than line frequency.