I have an unregulated multi-voltage (knob-selector) power supply that I would like to power one of my external Arduino projects.
The power supply is a 230Vac Input, 3,4.5,6,7.5,9,12Vdc 1A from http://www.maplin.co.uk/ac-dc-multi-voltage-1000ma-power-supply-46107
When I measure the output (no load), no matter what voltage is selected via the knob my multimeter reads 17Vdc.
Would this be correct. I want to use 12Vdc to power my Arduino and also 2 small 12vdc motors (200ma) each. Will this be OK as the suppiler said that as soon as I apply a load to the power supply it will drop to the selected voltage. I don't want to pus this in to my Arduino just yet in case I burn it out with 17Vdc if the volatge does not drop to the selected 12v/