On May 9, 10:40*am, Tony Sivori wrote:
On Sat, 09 May 2009 16:08:51 +0100, Arfa Daily wrote:

The current rating of the power supply is unimportant - sort of - as
long as it is at least enough. I say "sort of", because it depends on
whether or not the supply is regulated. If it is, then it doesn't matter
how little, or how much, up to the rated current level, that you draw
from it. The voltage will remain at 9v give or take. If the supply is
unregulated, then the chances are that it will be rated at 9v nominal,
only when it's loaded close to its maximum. At lower currents, the
voltage could well be 20% above that, particularly with small
transformers which are notorious for poor load regulation. So the output
could easily be up around 11v when lightly loaded.

Your bark trainer might well tolerate this, even though it represents
getting on for 100% over-voltage, but it is a risk that I don't think I
would want to take for the sake of shelling out the small amount that a
suitable 6v regulated wall wart would cost.

Thanks for that. Sometimes I am too cheap for my own good.

--
Tony Sivori
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Any 6 or maybe 7.5 V max supply that is capable of providing at least
200 ma should work, assuming the connector is correct. Most supplies
have the center conductor as +, but not all so be sure to check.