walwart specs - what to get?

[tskullt]

Hi everyone,
   I've searched but can't find the answer....   Just powering one DIY pedal, what amperage walwart should I get?  I've got a 9v 100ma and a 9V 300ma from some old cordless phones.   Any rules of thumb?
Thanks for your help,
m.

[KORGULL]

I'd go with the one with the lowest current rating. I think if it can put out way more current than you need, the amount of excess voltage can also increase - which may or may not be a problem for your circuit.
If you only need 25mA to power your pedal and use a 300mA unregulated 9V supply, your pedal could receive significantly more than 9V.

Also, the trick where you splice in a 100 ohm series resistor and parallel 1000 mF cap on the wall wart power cord works great for taming hum/noise when using cheap, unregulated power supplies. You might want to try it.
Some more details about that here: http://www.diystompboxes.com/smfforum/index.php?topic=37942.0

[petemoore]

  Visual Sound One Spot...Positive barrel.. [easily enough reversed if necessary..I did].
  this is the best power supply purchase I ever made, used mine tonights gig to power an EZ Vibe, a Wah [which don't like adapters, but makes exception for the
1S], EQ, and Comp.
  Compared to batteries it's no noise...in my tests.
  My buddy Bill said the same thing, boy he Reallyhad noise before, too.

[tskullt]

hey pete,
    What is it rated?   (how many mA?)
m.

[Roobin]

If it's just for one pedal, use a battery and mesure how much current it is drawing. Simply rotate the battery 90degrees and only clip one side in, and use a DMM.

[stumper1]

I believe the current One Spot is rated at 1700ma.