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AC Adapter Plug Explanation

 
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CDobyns
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Joined: 26 Jan 2009
Posts: 1

PostPosted: Mon Jan 26, 2009 11:21 pm    Post subject: AC Adapter Plug Explanation Reply with quote

I'm posting this mostly to just understand the workinging of an AC adapter plug. I'm interested in understanding the outputs from an adapter plug, and what the outside, inside barrel and center pin connectors are for.

I saw in a previous posting:

http://forum.hackedgadgets.com/viewtopic.php?t=1819&sid=e55478689e0415dbf5a27d9424973469

that the graphic on the adapter seems to indicate that the outside barrel connector is negative and the inner barrel connector is positive. But what is the center pin for. Ground? I tried to test these with a continuity tester and correlate them to the three input plugs at the front of the adapter (where the AC wire plugs into the adapter). Unfortunately, I only seem to get a continuity signal from one plug and the outside barrel connector. What's the story (or speculation) on the other plugs?

This adapter is currently supplying AC to a laptop computer, but I don't understand why the continuity test fails. The adapter has given me some problems in the past, but has been working reliably recently. To recap, mostly I'm interested in the plug configuration and specifically the purpose for the center pin connector.
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