Power Adapter Actual Output in Volts

Ok, here's the story. I recently bought power invertor for my 12V car cigar lighter socket that allows me to plug in devices like mobile phones and my Powerbook using the standard 3 pin plug and Mac power adaptor. Great when you're a passenger on road trips to watch DVDs or just to recharge whilst on the move. Anyway, when I plugged in the Mac the charge light didnt show so I went back to Maplins to query the problem. The were very helpful and established the invertor was ok, the rating on inputs and outputs were well within its capabilities so we ended up taking a volt meter to the power adaptor. The result showed there was only 0.4 Volts coming out of the adapator when plugged into the mains and less when on the invertor. I'm confused, the adaptor is seemingly charging my Powerbook ok off the mains. So does anyone know what the actual output from the Mac adaptor shoud be. Im guessing my adapter needs replaced but I have to say it seems to charge the battery off the mains pretty quickly.

Problem solved by buying a more powerful invertor. Whilst initial invertor spec suggested it would power the Mac there may be an issue with the fluctuations in output that is solved by going large on the invertor. The capacity of the new unit is 300W, way too much, but it does seem to mean that low wattage is supplied consistantly well to keep my PB 12 happy. Now heading to Chamonix by car with Mac on power lead PW

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I am not sure why you want to do that...the power adapter takes 100-240 volts AC at 50-60 Hz and converts that to 5 to 5.1 volts DC at about 2 amps. Why are you inverting 12 VDC to 240 VAC then back to 5 VDC?
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At the Apple Store, they told me that I could use a power adapter and cable for an iPod with my iPhone. Seems to work fine, charges the battery fine. But I notice that in the tiny print on the side of the iPod power adapter it says, "Output 12V -- .67A". The print on the side of the adapter that came with the iPhone says "Output 5V -- 1A".
Wouldn't want to fry my phone battery with those extra volts.

It's not $29.99 + $19.99. They include with the iPhone both a dock/charger and a power adapter/wall plug charger. But only one cable between either of them and your iPhone. So, if you have a computer in one room and you charge your phone overnight in another room, you need another cable.
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I'm a musician and use my mid-2007 MBP 15" in my live rig. When I use the power adapter, I hear a buzz, sometimes accompanied by a slightly louder buzz that cycles on & off about 1x/second. There are a few weird things going on here:
1. The buzz does not happen all the time. That leads me to think it may be noise in the AC line that the adapter is plugged into.
2. The noise is heard when I use both the built-in audio output AND an external USB audio interface.
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Hello,
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I have two Compact USB 4-Port Hubs, Model Number USBHUB4C. These Hubs can be powered, but I cannot find any information on External Power Adapters for these Hubs in any of the documentation or on the Linksys Web Site.
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Friday, August 28, 2009, 0302 PDT
Hi, again,
Boy, am I glad I was able to find an answer to my problem in here. I find this very interesting. Here it is, almost 3 years after I made the original post, that I need to find the Power information, for this Device, again, but because of a Computer Crash, I could not get to the original notes, I made about this Forum Entry, so I began the search, again.
I find this very interesting. Here it is, almost 3 years after I made the original post, that I need to find the Power information, for this Device, again, but because of a Computer Crash, I could not get to the original notes, I made about this Forum Entry, so I began the search, again.
I have myriad AC/DC Converters, some of which are Voltage Selectable, but since the Power Specifications aren't on the HUB, or in the PDF Documentation, as is the case with most other Products, I came back to LinkSys/Cisco. As soon as I entered the Model Number of the "Compact USB 4-Port HUBs, Model Number USBHUB4C," for a search, this Forum entry came up on the page, and it appears there haven't been any queries, on any other subject, about this Device, in the interim.
Since the entry has been Viewed 2,484 times, hasn't it dawned on someone that it might be a good idea to carry a Power Product, that is compatible with this HUB, or at least provide a Specific Source, with a Model Number, (for instance, a Radio Shack SKU) so we don't need to hunt for one, over, and over. Why the information was never included in the package with the HUB, beats me. (It should have been on the Device, itself.)
Anyone who knows anything about USB Devices, knows that many of them cannot be powered from the USB Ports on a Computer, especially, on Laptops. Since one of the things mentioned in the Specifications is the fact that you can have "Max. Devices 127 (Daisy-chaining Hubs Together)," it would seem to be obvious that Power Information would be necessary. Since the "Daisy Chain" number is true, it should be obvious, that the "Chain" would require quite a few AC/DC Adapters to power it, adequately.
When this Device was Designed, the requirement for External Power must have been known, or there would never have been a Power Connector built into the Device. I've been in electronics for about 50 years, now, and I know that presently, it's a rarity that the Power Requirements aren't shown on the Device itself, with a Symbol depicting the Polarity of both the Inner, and Outer Conductors. Even Toys have that information shown on them.
I love these HUBs, but LinkSys/Cisco has really dropped the ball on this one. I'm guessing that a lot of people have discovered, that if this 4-Port USB HUB doesn't have External Power, they quickly decided not purchase another one, when they need to "Daisy Chain" them together, for their Network of USB Devices.
When you consider the loss of HUB Sales, coupled with a loss of income from a Power Supply they've never stocked, the numbers could be quite large. That's not even considering the Support time I'm guessing would have been necessary when Customers determined they had a problem, and needed answers. (It's not really a guess, since I talked to several Support People, without getting a satisfactory answer, before I finally came to this Forum, as a last resort.)
I was actually shocked to find that LinkSys/Cisco, didn't sell an AC/DC Power Supply for the HUB, because Power Supplies like that are so commonly required, with the Electronics sold, today. I'd be willing to wager that LinkSys/Cisco does, in fact, carry an AC/DC Power Supply that would be compatible with the "Compact USB 4-Port HUBs, Model Number USBHUB4C," they sell. When something like this happens, I wonder how many other Opportunities like this, have been missed by the people who work for this company.
We've all heard the expression about "Being too close to the Forest, to see the Trees." This may be a good example of it's meaning. At least I was able to find the answer to my Problem, thanks to the fact that the Query I made almost, 3 years ago, which had an answer, was still available to me, thanks to this Forum.
Very Interesting!
Bruce Feezel
Comedian62

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Hello
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I sometimes use my real UK purchased UK power adapter to charge my iPad, however I've never noticed any difference (but I'm not entirely sure if it's the high wattage adapter, it seems to charge the iPad.)
Ok, long message but please let me know what to do!!!!!!

If all you want is the US version of the power head, I do not see that shown in the US Apple store so I doubt that they're available separately. All I can see is a kit which includes 6 different head styles (their "World Travel Adapter Kit").
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@sjahanmi,
Parts list for T440s -> http://download.lenovo.com/parts/ThinkPad/t440s_fru_list_20130724.pdf
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Which AC did your laptop came with btw?
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I have a Y2P (i5) ... Feel free to ping me if you want me to test some applications with your Y2P if you have the same model. I don't mind keep doing recovery on it if needed .... =)

Is it possible to use the firewire power adapter for ipod to charge an Ipad

There is information everywhere that the Ipad doesn't charge with low power adapters.
The first power adapter I received with my first Ipod was the firewire power adapter and it allows intensities even higher than the 10 W Ipad adapter.
Could this old adapter be used with Ipad
Model n. A1070 output 12V 6.7 A if I believe what is written on it.

You should only use a USB-type charger for the ipad. Any other charger is risking damage to the ipad.
The ipad uses 5Volts at 2 amps for best charging. This is why it came with the wall charger.
You can charge it with any 5 Volt USB charger as long as the output amps is approximately 1 amp or more. If the amps rating on the charger is less than 2 amps, it will charge slower, but it is safe. The ipad will only draw the current it requires, but any voltage higher than 5 volts is risking damage to the ipad.
Hope this helps.

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Hi. I have an older Apple USB Power Adapter (model A1102) that I've been using with an Ipod Mini (bought it with the mini a long time ago). I have a new 3G nano on order. Will this power adapter work with the new nano? Or will I be forced to buy a new one?
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Since I also converted from a Mini to a 3G Nano, I thought I'd give you a couple of pointers; I probably spent a couple of days preparing my existing mp3 library (and that says nothing about videos).
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Can I use a new US MacBook Pro with a UK power adapter? I am pretty sure I can as the output of the adapter says 100-240v, but would welcome any input other than my assumption! Many thanks.

Welcome to Apple Discussions
Yes the MagSafe can be used with any 100-240 volt supply, you'll get best results if you use a cable/adapter that has an earth or you might feel a tingle in your palms when using it ...

TungstonE power adapter

My Tungston E has gone unused for over two years and I need to reinstall in on my new computer. Step one seems to be connect and charge with a power adapter. BUT I can't seem to locate/identify my power adapter among all the power adapters I have hanging around from telephones, etc. What does the power adapter look like or what markings are on it so that I can find it and properly charge?
Post relates to: Tungsten E

You can and will damage it if you send the wrong voltage/current into it!!!
Look for one with about 5.0 - 5.4 volts DC output that fits. If you send something with AC or much higher voltage, you could fry it...
WyreNut
Post relates to: Centro (AT&T)
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Power Adapter Actual Output in Volts

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