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Old 06-18-2015, 10:25 PM   #6
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Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
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Posts: 39,203
Default Re: Adapters Voltages?

Originally Posted by pc7fan View Post
Once I had a 12V 500mA wall wart and unloaded it was reading around 28V (but with a 24 ohm resistor - 500 mA load), it was 10% of the labeled 12 volt rating.
If that is the case I hope it has 50VDC rating caps in that wall wart.
To get 28V the cap is charged up to the peak of the transformer Voltage, so in this case the transformer AC is around 28V *0.707 = 19.796V!
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