I want to use an unregulated ac to dc converter to power an Arduino board. I know Arduino can take a supply up to 12V on Vin. My power supply says that its a 9V 300mah supply, but when I put it on a voltmeter it reads almost 15 volts. I thought I remembered reading that the unregulated supplies will typically read higher-than-stated until they are applied to an electrical load close to what they are rated for. Is this true? Furthermore, is it safe to power my UNO board with this power supply? I'm pretty sure the power supply is not faulty. I have several of this exact same power supply and they all read around 15 volts (with no load applied to them). Thanks!-Brian
That's because the wall wart is a VERY old fashioned LINEAR transformer and NOT a modern switching supply. Throw it in the trash and buy a switching supply !
Litter lout.You could at least unwind all that copper wire and use to make a kitten zapper.
"blindly obedient" dogs.
Well mine used to be blind in one eye.The cat was suspected.
I should have used a cast statement.