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Registered
Join Date: May 2007
Location: Sapporo, Japan
Posts: 926
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power adapter cord polarity -- help
Ok, been googling for a while ... I figured you'all be smarter
  Which wire is negative ? black or b/w lolo, that will answer the which wire is positive  Just FYI, I'm working on a carpc  The actual suspect wire  Which is gonna be plugged into an adapter and into my voom pc case that is using a mtx-3 psu. still trying to figure out the wiring part since I bought the parts used ... manuals only help so much... Thanks!
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Carsten AKA Sapporo Guy  1982 SC -- US import it seems ... weeeeeeeeeeeeeeeeeeeee
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02-06-2010, 09:52 PM
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Platinum Member
Join Date: Jul 2001
Location: Leave the gun. Take the cannoli.
Posts: 20,956
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Could be either. I wouldn't take a chance supplying reverse polarity to electronics.
Plug in the adapter and measure it with a voltmeter. |
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02-07-2010, 04:18 AM
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Used Up User
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In the top pic, the inner contact is positive (hot). The little diagram on the adapter tells you that & I am sure a DC voltage tester would confirm. But with crimp on connectors, I could only guess . . . test it with a voltage tester before you power it up (or blow something up) imho.
Ian
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'87 Carrera Cab ----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein ----- |
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02-07-2010, 04:18 AM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,943
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Usually the wire with the white stripe is positive.
Get a VOM and make sure!
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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02-07-2010, 06:23 AM
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Location: Sapporo, Japan
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Thanks guys!
For the reasons you guys have given I figured I'd rather be laughed at for being a noob than be laughed at for firing my car pc mobo ooops, should have posted that the 2nd picture is of the crimp connectors coming from the coaxial connectors not the actual adapter. Idea is to use the above connection to go between a regular pc type of power adapter and the mobo molex connector. Will do on the voltmeter .... lolo, gotta learn some more on that Thanks !!!
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Carsten AKA Sapporo Guy 1982 SC -- US import it seems ... weeeeeeeeeeeeeeeeeeeee
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02-08-2010, 06:25 AM
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Join Date: May 2007
Location: Sapporo, Japan
Posts: 926
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firing ... lolololo
Frying
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Carsten AKA Sapporo Guy 1982 SC -- US import it seems ... weeeeeeeeeeeeeeeeeeeee
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02-08-2010, 05:31 PM
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Join Date: Jun 2003
Location: Calgary Alberta, CANADA
Posts: 2,113
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Easy, use an old speaker.
One way the cone will go down and the reverse will go up. The proper polarity will be on the latter. (the + or - are indicated in the speaker connectors)
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We're all in the gutter,but some of us are looking at the stars. -Oscar Wilde |
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02-11-2010, 09:52 PM
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Quote:
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Make sure to check out my balls in the Pelican Parts Catalog! 917 inspired shift knobs. '84 Targa - Arena Red - AX #104 '07 Toyota Camry Hybrid - Yes, I'm that guy... '01 Toyota Corolla - Urban Camouflage - SOLD |
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02-11-2010, 09:57 PM
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1987 Porsche 911 Carrera Cabriolet 3.2
1984 Porsche Targa 3.2L
