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What is the polarity of the power in connector

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The large outer connector is negative and the very small center is positive

Posted on Jul 15, 2010

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Model 2011 jay flight g2 when hooked to AC power has 120 volts on external TV connector. Can I get an electrical schematic for the 29RLS floor plan?


What you are saying is when you connect that motor home to a shoreline power connector, the outlets are reverse polarity. You can confirm that with something like this: http://www.acmehowto.com/electrical/outlettest.php
You can get this tester at any hardware or lumber place. What caused this? Somehow the polarity got reversed and it is most likely at the connection on the outside socket. It can also be the shoreline drop cord or the breaker box. In an electrical outlet, the small slot is HOT and it should be connected to a BLACK wire. In an appliance like a television the neutral wire (white) is connected to the ground or the chassis of the device, when the polarity is wrong the chassis becomes hot and you get the problem you describe.

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How do I remove electrical interference on my dvd recorder?


Hi David
You need to figure out how the interference is getting inside.
Look at the external connections.
HDMI Cable or Perhaps the Power Connector.
Noise from the power cable would be most likely.
A Ferrite Bead can often be clipped onto power lead to dampen electrical noise. Electronics supply stores have these.
If an AC to DC external box is used. What is the required DC input to your DVD ?
For example if the AC is dropped to 12v DC and then plugged into player via a small connector. You could get your own connector and supply from a 12v vehicle battery. Be careful to maintain correct polarity to tip of connector.
Use a cheap multimeter to check voltage & polarity.
Substitution....This would prove that the noise source is from the Power Supply.
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1 Answer

What external power does SmartDisk FireLite FWFL120-N take?


Many USB power supplies will have the right plug. I picked one up by buying a cheap USB hub, What you want to look for (most likely on the bottom of the power supply) is VOLTAGE Output: 5.0 VDC, POWER Output: 1.0 amp or (1000ma) and the center hole is the positive side. I have even seen some BluTooth earpiece charges that supply what you need.

Hope that this will help.
AAirwolf

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1 Answer

Just got hold of a Roland R8 but no power supply - any ideas?


Well, you might try:

http://www.yub.com/products/?productID=3190411

The supply has a three pin connector and supplies +10 and -10 volts at unknown current. Don't have a pinout.

I am sure you can cobble something up if you can''t find the ACH120 official power supply.

You would need to find the pinout polarity to connect power if you have to make your own. One would taake unit apart and trace those input wires to something that would define the polarity. First find ground, then look for input filter caps which will tell you the polarity on the pins.

Jan 30, 2010 | Music

1 Answer

Ineed the voltage and connector polarity for the ADS TV ELite Pro


I just found one too, same situation... no power supply. Mine has box and all. On the back of the box, it reads:
Power Supply 7.5 VDC power adapter

It doesn't say what polarity, but judging from the board... I'm gonna' say + in the center. That's what I'm gonna do.

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1 Answer

Looking for power adapter for lingo noaa 740/ ne 370 weather radi


Here is a general case solution that might work even if you don't have the manufacturer's expensive adapter if you have some tech skills. Check the input plug on the radio. If you are lucky it should have a symbol next to it with a dot within a circle. The dot gives the polarity of the center connector and the circle gives the polarity of the outer connector of the plug. If you are super lucky, you will have the correct adapter already in your parts bin. Otherwise, you can buy universal 12V power adapters online from all electronics and radio shack. They include just about every kind of plug option and also some feature to select polarity.You can try the various plugs and find the one that fits perfect & then set the correct polarity. The current is not so important as long as you meet or exceed the required capacity which is often not given. Both universal adapters can provide 1000 mA which should be more than adequate. There is always a chance to screw up any electronic part; I can attest to that, but I keep 2 or 3 universal 12V power bricks on hand and have used them for many tech items.

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There may be a virtually invisible polarity symbol on the case next to the connector.

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Gateway 405ROG AC Adapter Output Polarity


it doesn't matter if its + or - , make sure the pc runs on 19 volts and that the AC adapter does also, look underneath the laptop to find out if it does run on 19 volts but make sure the power jack fits the socket o the laptop before plugging it in to the mains

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1 Answer

Monsoon power cord needed on old computer speakers


leejean


the very best way to solve your problem, go to the electronic store and ask a dc power supply adapter 15volt 2A,vice versa polarity. with universal connector for it sure you can select the right type connector do you have for it fit to the back socket of your unit. before you connect read the correct polarity of your device you see label at back (+, -). and set the polarity output of the adapter correspond to your unit,,,

johnfil,,,,

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1 Answer

Modified power conector polarity.


I know what you're trying to do, and I don't recommend it. I've done some splicing, and had a few that burned up the machine, so I recommend buying a new power supply. Check Ebay, you can generally find one at a reasonable price. Here check this link to Ebay, they have your adapter for $16 and change. You can't beat that. So why take the chance of ruining the machine.

http://search.ebay.com/search/search.dll?from=R40&_trksid=m37&satitle=ECS+A535++ac+adapter&category0=

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