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For example, this would do it fine, but others may not be able to.
R.
Eqd Speaker Cranker clone
Monte Allums TR-2 Plus mod kit
Trading feedback: http://www.thefretboard.co.uk/discussion/60602/
If it is genuinely over 100mA, don't do it - although power supplies have a bit of safety margin too, there's a risk of damaging it… not necessarily immediately, but over time.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I had a Line 6 M5 that was recommended to have a 500mA supply, but the actual current draw is a lot less. I ran it very happily off a 400mA supply, and I think it will run off of less than that.
Also, a lot of digital pedals draw a lot more at startup and then settle down to a lower continuous draw. The figure given might be the start up current. If it's just for a few seconds then a lot of power supplies will cope with going over the official rating where you wouldn't want to do it continuously. It's worth finding out the continuous draw if you can
For some pedals it depends on how you use them as well. For instance, I think I remember reading that some of the big Strymons draw a bit more current when you are using MIDI to control them than when you just use the footswitches on the pedal.
Ultimately, getting a decent power supply is a worthwhile investment anyway. Sometimes pedals can get noisy if the power supply is struggling.
(he says, running a 200ma Boss DD-20 off 2 120ma taps on his Harley Benton Power Plant Jr, cough)
http://stinkfoot.se/archives/867
Manufacturers always err on the high side.
On the other hand. Most good quality power supplies are probably rated conservatively, so are probably capable of a bit more than they say officially.