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Old 18th August 2011, 01:49 AM   #1
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Default 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: http://img.alibaba.com/wsphoto/v0/48...pg_200x200.jpg

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Old 18th August 2011, 02:35 AM   #2
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Ground != negative on many amplifiers. For instance: Many Tripath amps require -45v, +45v and "ground".

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Old 18th August 2011, 02:44 AM   #3
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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.

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Old 18th August 2011, 03:35 AM   #4
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Thanks. I see the short when disconnected and no short when plug is inserted. Thanks.
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Old 18th August 2011, 10:24 PM   #5
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little voltage, big voltage and HUGEEEE VOLTAGE


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