On Nov 7, 2004, at 2:08 PM, Jan-Erik Soderholm wrote:

> Now, 5V wall warts are a bit rare (not?)

Not really.  You can find them pretty easily, if you're willing to buy.

Note that many wall warts are not regulated, so a nominal 6V wall wart
is likely to put out 10+ volts if not loaded near its current spec.
JameCo is a vendor that carefully distinguishes between their regulated
and unregulated wall warts; they've got about 10 5V units...

> I think I need some
> kind of regulator in this power box. A common linear regulator
> commes to mind, but in a closed box (some simple cheap plastic
> thing), heat would/could soon be a problem, right ?

It depends on how much power you dissipate, of course.  Providing
100mA@5V from 12V with a 1.5A (TO220) probably isn't much of a problem
(what do you think is actually IN the average regulated wall wart?),
but as you need more current, you'll have to be more careful.  Cheap
linear regulators DO have thermal protection, so it might be worth
just trying...

BillW

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