Spend the $58 and get a current-limited supply.  That feature alone is
worth it.  I've saved many buggy boards by having the current limit trip
and not destroy a board while I figure out what's wrong.

The wall-warts I totally agree with.  I have a bin of them from misc
wherever - trash, flea markets, household electronic junk friends are
tossing, etc., and I use them all the time for one-offs I give to
clients.  You do have to watch the voltages out, but most circuits I
wind up making are 7805 @ < 200mA and its hard to go wrong.

J


William Chops Westfield wrote:
> On Wednesday, Apr 21, 2004, at 23:54 US/Pacific, Robert B. wrote:
>
>> $50 I would definitely go for.
>>
>
> http://www.elexp.com/tst_1802.htm is $58 (plus postage/etc.  sigh.)
>
> You have some leeway in your lm317 design.  Should be good for at least
> 500mA with a heatsink.
>
> I'm starting to be a fan of wall warts of assorted types.  They can
> usually be plucked out of the trash.  Some aren't regulated at all, but
> others deliver the same sort of convenient voltages as a PC supply in a
> much nicer package...
>
> BillW
>
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