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johnviera 18th August 2011 01:49 AM

DC input jack has 3 terminals ?
Why do DC input jacks have 3 terminals? Positive (+) Negative (-) and (?)?

Ground ??? Isn't Ground the same as negative ?

Like these:


Jim McPherson 18th August 2011 02:35 AM

Ground != negative on many amplifiers. For instance: Many Tripath amps require -45v, +45v and "ground".


theAnonymous1 18th August 2011 02:44 AM

Two of the terminals are touching when there isn't a plug inserted. When you insert a plug they disconnect, leaving only one in contact with the plug.

You could use this to charge a battery powered device. Inserting a plug would disconnect the load from the battery so only the battery is connnected to the charger.

I'm sure there are other uses as well.


johnviera 18th August 2011 03:35 AM

Thanks. I see the short when disconnected and no short when plug is inserted. Thanks.

zerokelvin99 18th August 2011 10:24 PM

little voltage, big voltage and HUGEEEE VOLTAGE



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