On Dec 14, 2008, at 11:53 AM, Paul wrote:

>
> How do you test the output of the AC adapter? I tried connecting a
> voltmeter to the output plug in all the ways I could see, but got no
> readings on two adapters that work.

The outer sleeve is not connected. It is present for mechanical  
strength. Also to shield the inner connector from possible shorts.

(Previous PBs used a female connector and no outer sleeve. This PB  
uses a male connector with a protective sleeve).

Inside the sleeve is a 3mm (more or less) tip-ring plug.

You measure the voltage at the tip and ring.



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