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Old 15th December 2009, 03:51 AM   #1
mattmcl is offline mattmcl  United States
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Default Reterminating wall wart

I'm working on my first project, so this is a very nooby question but I want to be sure I understand.

I have a center positive wall wart which I need to reterminate. The positive wire is marked, so I can easily cut the old terminal off and resolder the new one on. What is the best way to test it? I know I can plug it in and measure the current with my multimeter, but how do I test to make sure I have center positive?

(This is somewhat theoretical, because I can be pretty darn sure to solder the positive wire in the center, but I want to understand what I'm doing.)
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Old 15th December 2009, 05:27 AM   #2
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Uhm, what is there to understand?
If you have a DC wall-wart you can just switch the wires, or if you like to do it complicated, you can cut the wire, use the ohm or beeper mode on the multimeter(asuming it has one) and find the center-pin wire, then mesure where the positive lead is and connect the dots from there.

Unless I misunderstood you of course. Just try not to electrocute yourself(irony, I doubt it's even possible unless you really get creative ).
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Old 15th December 2009, 06:53 AM   #3
es44 is offline es44  Denmark
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Quote:
Originally Posted by mattmcl View Post
I know I can plug it in and measure the current with my multimeter, but how do I test to make sure I have center positive?

(This is somewhat theoretical, because I can be pretty darn sure to solder the positive wire in the center, but I want to understand what I'm doing.)
Don't measure the current, better measure the voltage. If you really want to understand what you are doing, please learn the difference of these.

Best regards
Ebbe
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Old 15th December 2009, 03:12 PM   #4
mattmcl is offline mattmcl  United States
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Originally Posted by coolbeer View Post
Uhm, what is there to understand?
I was wondering how I would test for center positive if I didn't know which wire was positive? That's what I meant by theoretical.
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Old 15th December 2009, 03:17 PM   #5
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You mention that you have a multimeter. Did you notice what colour the probes are? One is positive (red) and the other is negative (black). If you connect the red probe to the positive and the black probe to the negative, you will get a positive reading.
This is SO basic.
Seriously.
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Old 15th December 2009, 06:10 PM   #6
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If you're going to be working with electronics, perhaps a refresher course in electricity is in order.
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Old 15th December 2009, 11:33 PM   #7
Jason is offline Jason  Australia
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When you can write a whole page essay about how electron flow is taught back to front at school, this is hardly a stupid question. http://www.eskimo.com/~billb/amateur/elecdir.html - should you connect a multimeter black to red, or black to black? If you've never done it before, how would you know? Shudder to think you might politely ask on a forum instead of crossing your fingers and hoping for the best and having enough money to buy it all again if you screw it up.

Matt welcome to the forum, and my sincere apologies - we have some people here that forget what it was like to first pick up a soldering iron with a sense of wonder and curiosity.

If we can't make newbies feel welcome here there is a serious problem - this forum was set up specifically to help newcomers bridge the gap between want and have.
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Old 15th December 2009, 11:50 PM   #8
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by Jason View Post
When you can write a whole page essay about how electron flow is taught back to front at school, this is hardly a stupid question. http://www.eskimo.com/~billb/amateur/elecdir.html - should you connect a multimeter black to red, or black to black? If you've never done it before, how would you know? Shudder to think you might politely ask on a forum instead of crossing your fingers and hoping for the best and having enough money to buy it all again if you screw it up.

Matt welcome to the forum, and my sincere apologies - we have some people here that forget what it was like to first pick up a soldering iron with a sense of wonder and curiosity.

If we can't make newbies feel welcome here there is a serious problem - this forum was set up specifically to help newcomers bridge the gap between want and have.

I guess if you look at it that way, however what he asked wasn't even related to audio, this is diyaudio right ?

ANYWAYS! it's a simple thing to do, its just as easy to unplug a cord from the wall and flip it over and plug it back in, you match wire for wire, using your meter to check polarity after, and bing its done.
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Old 16th December 2009, 12:16 AM   #9
Jason is offline Jason  Australia
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Hi Jason. Matt said he's working on his first project. Yes, could be a motorized alligator project. Probably is an audio project. But it doesn't matter anyway. I think the point is that it's best to never assume and be as friendly as possible to people sticking their neck out to ask what to most of the members here are simple questions though
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Old 16th December 2009, 12:20 AM   #10
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Matt I apologize for being a bit snide. Like Jason says, we forget about our own humble beginnings sometimes.
Have fun.
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