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-   -   DC input jack has 3 terminals ? (http://www.diyaudio.com/forums/class-d/194837-dc-input-jack-has-3-terminals.html)

johnviera 18th August 2011 02:49 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: http://img.alibaba.com/wsphoto/v0/48...pg_200x200.jpg

JV

Jim McPherson 18th August 2011 03:35 AM

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

-Jim

theAnonymous1 18th August 2011 03:44 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.

CONN 2.1MM JACK W/HARD PNL MNT - PJ-005A

johnviera 18th August 2011 04:35 AM

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

zerokelvin99 18th August 2011 11:24 PM

little voltage, big voltage and HUGEEEE VOLTAGE

..

sorry


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