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Can I reuse a charger (AC Adapter) on another device?

Polarity, volts, amperage and interface are the variables. Suppose I have left over AC/DC adapter from one device. And it has the proper male female plugs to connect. What if the device (eg my desktop scanner) expects +voltage on the outer ring and - on the interior (+/-), but I plug in an adapter that is -/+? What if adapter voltage output is lower/higher than expected by the device? Same question with amperage.

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There is an international standard as to which sections of the plugs provide what type and how much of a specific voltage. That is why there are so many sizes and shapes of all the different plugs (to meet all the different voltage requirements of various devices).

Generally speaking, if the plugs fits at all, then there is a pretty good chance that it will work, and there is only a VERY slight chance that it could actually cause any harm to your device.

However, to make sure that it will work for your device, you'll still have to look on the back of the adapter and check it's voltage output, and then compare that to the requirements of the device you want it to power.

You can also get inexpensive "universal" power adapters that come with lots of different plug fittings that you can use for all sorts of different devices (think Radio Shack, Best Buy, Walmart, etc.). Just try them all out and when you get to one that fits your device and works, you're in business.

That's pretty much all there is too it. Good luck!

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good answer +

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PLUG SIZE IS NOT ENOUGH! MAKE SURE TO CHECK VOLTAGES! I had a very helpful friend who decided to reset my router and modem. They just happened to have the same plug size & when plugging them back in he switched the cables (idk how). 12v went into my 6v router & my nice new toy fried :(

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Thank you. I have a 12V light- but I want to use it in the house- can I use an old adaptor 12V @1.5 AMP- about the same as 2AA to power the light?

Appreciate your thoughts. ned

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ned, yes you can

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thank you. molded plug- from sketch on unit center socket is hot but, when I cut it off would the wire with the stripe but +/- by convention?

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Typically, not always, the center pin is the positive. You can test this with a voltmeter.

As long as the voltage is the same on the adapter and on the device (also, I have 9V DC and 9V AC adapters, do not mix these up) and be sure the current required is less than the amount that the adapter can source otherwise you risk overloading the power supply.

I go to thrift stores and pick up spare adapters all the time, if you know what you are doing you can cut off the plugs and match up the voltages. Saves a bit of money but if you do not have the experience it might be better to just buy a universal adapter.

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Try to take the tranformer apart an measure amperage and volts. Try adding resistors to the power output. If polirized differently desolder the conections and resolder them in reverse.

-Me-

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Make sure the power adapter is not only the right voltage but is able to handle the needed power to supply your device with enough voltage to operate. The power formula P (watts) = I (ampere) x V (volts) shows you that if for example the needed power is 5 watts and the adapter delivers 12 volts, the adapter must be able to supply a current of at least 0,41 Amps (or 410 mA).

There's no risk in selecting an adapter that is able to deliver a current of 1 Amps (1000 mA) at 12 volts. The device is not harmed by this.

If the current is not enough, voltage might collapse causing slow charging of battery devices or inoperatibility of the device.

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AC chargers are used for charging portable gadgets; different chargers have different voltage specifications and hence you should be careful about which charger you are using for your gadgets.http://www.whatisall.com/technology/what...

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