So my charger isn't charging correctly, and I figured I'd try the Dynex universal charger. I wasn't up for soldering and measuring voltages, etc. Best Buy wanted $30 for it, but I found it on an amazon store for $6.50!
http://www.amazon.com/Dynex-Universal-Camera-Camcorder-Adapter/dp/B003RXH7WG/
(only 2 left in stock at this price)
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It just arrived and it's charging my TF + dock perfectly. I heard it charges a hair slower than the stock charger, but I don't mind. I also got an RMA for my ASUS charger, so now I can send it back to be fixed.
There are so many people are complaining about the charging issue that it sounds like a flawed design by ASUS. What I don't understand is: Why would anyone take a chance buying a new stock ASUS charger for $30+ when it might also be faulty? Especially when you can get one of these Dynex chargers for almost 1/6th the price!
Very.cool if this offer is here next week Ima try it ty
Sent from my SGH-T959 using XDA App
I wouldnt wait around if you want it at this price. There's only 2 left in stock!
I picked up this same charger for around the same price a few months ago. It has worked flawlessly. Now I would just like to purchase the Asus usb cable without the AC plug.
That's a good deal!
I called asus earlier today and got an rma for my charger. About an hour ago I tested another charger and I think I found out its the cable.
With the other charger, my cable didn't charge but with the other cable and my charger, it worked.
Sent from my Dell Streak XDA premium app - please excuse my miswyping
This might be better item than you realize.
The voltage switch you see in the picture is disconnected from the wall plug piece. The wall plug piece is 15v and has a 6 foot wire to 5.5mm barrel plug, e.g. almost perfect for the TF101.
If you convert the connector to female USB you can plug the TF 40 pin USB cable directly into the wall plug piece, because you do not need the voltage switch and tips. The converter is difficult to find but I have found them on ebay.
Once I realized this information, I also found the wall plug 15v items separately on ebay.
However, the voltage switch and tips are very nice for charging other stuff, like iphone, cell phone, other tablets, etc., at 5v.
Just to make sure I understand this correctly....does this replace my ac plug if say i lose the plug and this will actually plug into my TF (since it uses a proprietary connection) or do I still need that connection and can use this for something else?
I saw this at walmart about a month ago for like $15. I had it in my cart and at checkout I took it out because I "felt" I wouldn't need it and wanted to save the money. Lol.
It definitely looks like a useful thing to have around the house.
Bob Smith42 said:
This might be better item than you realize.
The voltage switch you see in the picture is disconnected from the wall plug piece. The wall plug piece is 15v and has a 6 foot wire to 5.5mm barrel plug, e.g. almost perfect for the TF101.
If you convert the connector to female USB you can plug the TF 40 pin USB cable directly into the wall plug piece, because you do not need the voltage switch and tips. The converter is difficult to find but I have found them on ebay.
Once I realized this information, I also found the wall plug 15v items separately on ebay.
However, the voltage switch and tips are very nice for charging other stuff, like iphone, cell phone, other tablets, etc., at 5v.
Click to expand...
Click to collapse
Yep, you can buy the barrel to female USB on eBay. Check the diy charger thread for links and info on polarity. I was going to buy this from best buy when my charger first started acting up but I found a similar one in my garage! Now just waiting on my barrel to female USB to come in :-D
elosogrande7076 said:
Just to make sure I understand this correctly....does this replace my ac plug if say i lose the plug and this will actually plug into my TF (since it uses a proprietary connection) or do I still need that connection and can use this for something else?
Click to expand...
Click to collapse
You still need the Asus USB cable that came with your tf. This just provides a 15v USB plug which is hard to find as most are only 5v and the tf needs above 11v to charge.
Bob Smith42 said:
This might be better item than you realize.
The voltage switch you see in the picture is disconnected from the wall plug piece. The wall plug piece is 15v and has a 6 foot wire to 5.5mm barrel plug, e.g. almost perfect for the TF101.
If you convert the connector to female USB you can plug the TF 40 pin USB cable directly into the wall plug piece, because you do not need the voltage switch and tips. The converter is difficult to find but I have found them on ebay.
Once I realized this information, I also found the wall plug 15v items separately on ebay.
However, the voltage switch and tips are very nice for charging other stuff, like iphone, cell phone, other tablets, etc., at 5v.
Click to expand...
Click to collapse
I'm guessing this is the adapter you are referring to:
http://cgi.ebay.com/USB-Female-5525-Plug-Female-USB-5V-Power-Adapter-/140408839695?pt=LH_DefaultDomain_0&hash=item20b104de0f#ht_2208wt_874
The description for this adapter says 5v, so will it support 15v? Is this safe?
It's no longer $6.50.
Xxq TZ pxX said:
I'm guessing this is the adapter you are referring to:
http://cgi.ebay.com/USB-Female-5525-Plug-Female-USB-5V-Power-Adapter-/140408839695?pt=LH_DefaultDomain_0&hash=item20b104de0f#ht_2208wt_874
The description for this adapter says 5v, so will it support 15v? Is this safe?
Click to expand...
Click to collapse
Right, that is it. There are lots of resellers on ebay.
Almost everything using USB is 5v -- EXCEPT the ASUS TF101 which puts 15v on the standard USB power lines. In my opinion, the cable shown can easily & safely handle the power levels. Just make sure nothing else (e.g. 5v stuff) gets plugged into the female USB socket at 15v.
RojasTKD said:
It's no longer $6.50.
Click to expand...
Click to collapse
Just search "dx-ua" on ebay or google. Lots more on the web.
Related
!UPDATE!
Starting a Barrel Charger keyboard Dock MOD Thread. If you want yours done for free I'm looking for a volunteer to send me a keyboard dock to modify with standard barrel charging adapter. Stay tuned for the tread link
Covering 3 popular charging topics
1. Why you can't use a USB 2.0 extension cable with the factory charger
2. Testing data proving the Tablet needs 11V or higher to chartge
3. Off the shelf parts and spare parts to make a Wall charger
4. Off the shelf parts and spare parts to make a Car Charger
1.Why you can't use a USB 2.0 with the factory charger
Because the charger is looking for termination of Pin 7 from the Tablet to start sending 15 Volts. Pin 7 is a USB 3 pin, not available in usb 2.0 so the charger never sees termination and continues to send 5V. This is why if you connect your phone or other 5V usb device to the charger it will charge at 5V.
The only way to trick the charger into always sending 15V so that you can use a 2.0 extension cable is to take it apart and bridge ground with pin 7. But you will not be able to use the charger for any other device, not worth it IMO.
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Here you can see that pins 5-9 are USB 3.0 only.
2. Testing Data
-The Tablet looks for more than 11V to start charging
-With a source other than from the ASUS charger I supplied pins 1 (RED HOT)and 2 (Black Ground) with 13.5 volts and it charges. My source was a 12V AC to DC power supply I use for testing DC devices.
-My power source was pushing 1.5 Amps during the charge
-All other pins were disconnected on the USB extension.
Its all about voltage. Any AC to DC adapter that supplies at least 11 Volts that has a female usb adapter with ground to pin 1 (RED HOT)and 2 (Black Ground)
CONFIRMED: I Connected my 13 V source to pins 1 and 4 on a USB 2.0 extension cable and it worked.
The Asus charger does need a 3.0 cable extension to work. But with a DIY charger you don't need USB 3.0 cables or connectors.
WARNING! Please know your technical limits and understand that any instructions you follow in this thread are at your own risk.
DIY ADAPTERS
--------------
Wall charging - Any Voltage selectable DC wall adapter that supports at least 11 Volts 1 Amp will work. You will need to add a female DC barrel to USB Female cable which are available cheap or can be made which I will post pics.
Off the shelf Parts $13.99 Total
!IMPORTANT! PLEASE BE AWARE OF POLARITY WHEN USING THESE UNIVERSAL ADAPTERS. YOU WILL DAMAGE YOUR TABLET IF THE POLARITY IS WRONG.
Check this SITE for information on setting up the tips for the correct polarity.
I check polarity every time I connect and disconnect my tablet when testing. If you have basic voltage meter and one USB cable you can sacrifice I suggest you test the polarity by creating a test cable. Cut the cable, expose the bare wire on red and black then test with your meter while connected to your generic charger. If your meter shows a "-" while showing the voltage your polarity is WRONG. If it doesn't show a "-" or in some cases a "+" your polarity is right.
Adjustable Voltage DC wall charger -EBAY $11 shipped.
UK Equivalent
Generic AC/DC Adapter Up to 12V and 1500Amps
5.5mm DC Female Barrel to USB Female cable - EBAY $2.99 Shipped EBAY UK LINK
EBAY UK LINK
Plug the adapter cable into the 5.5 connector on the DC adapter, set it to 12V , connect the factory Asus cable to the adapter cable and you are charging. Your 3.0 extension cable will work with this as well as any 2.0 extension cable. I'm waiting for the adapter cable and will post pics of the components connected together.
Or you can get an adjustable charger that comes with a USB Female adapter like this one
Building with spare parts
I'll be taking a 12 or 14 volt DC adapter I have and wiring a USB end directly to it. If you are a gadget person you might just have some spare DC adapters. Pictures soon. I'll also be making a version that includes the adapter cable from above.
Charging in the Car - Any Voltage selectable Car DC adapter that supports at least 11 Volts 1 Amp will work. You will need to add a female DC barrel to USB Female cable which are available cheap or can be made which I will post pics. You will be able to use the same adapter cable as above, you just need the car adapter
Off the shelf Parts $10.98 Total
Auto DC adapter Adjustable starting at 15V - EBAY $7.99 Shipped
5.5mm DC Female Barrel to USB Female cable - EBAY $2.99 Shipped
Plug the adapter cable into the 5.5 connector on the DC car adapter, set it to 12-15V , connect the factory Asus cable to the adapter cable and you are charging. Your 3.0 extension cable will work with this as well as any 2.0 extension cable. I'm waiting for the adapter cable and will post pics of the components connected together.
Multi function Car & Wall charger,
This is interesting, it has input for AC and DC so you can use it in the Car and at home.
Generic adjustable Car and Wall charger
For charging on a PC. - Not possible, There is no way to double the voltage from one power supply, connecting 2 cables together will not increase volts only AMPS.
OTHER KNOWN CHARGERS THAT WORK
Dynex DX-UA - Universal laptop/camera charger. $29
Radio Shack 12V adapter Comes with a free USB tip $30
X1 PST-1200UF NOTE: Even though this one comes with a USB tip you still Need to add the USB adapter cable because the manufacturer limits 5V to that one USB tip in the package.
UNTESTED BUT SHOULD WORK
PowerLine 90304 Need to add USB adapter cable
Generic adjustable Car and Wall charger Need to add USB adapter cable
My mess of a test bench =]
~DC
Just updated the OP and man this is frustrating, the charger is very sensitive.
try to get a scope, it is possible that the charge controller is in the tf while the charge circuitry is in the charger. the two middle pins might be control signals which would explain why touching them stops the charger. the lack of signals on the middle pins may explain why when using the dynex charger you lose the battery meter.
Rumbleweed said:
try to get a scope, it is possible that the charge controller is in the tf while the charge circuitry is in the charger. the two middle pins might be control signals which would explain why touching them stops the charger. the lack of signals on the middle pins may explain why when using the dynex charger you lose the battery meter.
Click to expand...
Click to collapse
DONE
It's voltage people, all voltage. No fancy communicating with the charger. Right now I have a DC power supply use for powering DV voltage devices connected directly to pins 1 and 4 supplying it with 13.8 Volts and it is charging. All other pins are disconnected. This is why the Dynex works, because it is 11 V.
Back to the OP with a follow up.
Something is still missing. If only pins 1 and 4 are used by the charger, then a usb 2.0 cable with four pin/conductors should work as an extension, but it doesn't.
would something like this work to charge from 2 usb ports?
http://www.amazon.com/Apricorn-Power-Adapter-Cable-AUSB-Y/dp/B000JIOHDE/ref=sr_1_1?ie=UTF8&qid=1306378019&sr=8-1
Rumbleweed said:
Something is still missing. If only pins 1 and 4 are used by the charger, then a usb 2.0 cable with four pin/conductors should work as an extension, but it doesn't.
Click to expand...
Click to collapse
True but my goal is to come up with more charging options. I've been charging my tablet for about 45 mins now, voltage and amps have been steady, 13.8 and 1.6.
skchan2 said:
would something like this work to charge from 2 usb ports?
http://www.amazon.com/Apricorn-Power-Adapter-Cable-AUSB-Y/dp/B000JIOHDE/ref=sr_1_1?ie=UTF8&qid=1306378019&sr=8-1
Click to expand...
Click to collapse
Possibly, I'm testing the 10V theory now.
skchan2 said:
would something like this work to charge from 2 usb ports?
http://www.amazon.com/Apricorn-Power-Adapter-Cable-AUSB-Y/dp/B000JIOHDE/ref=sr_1_1?ie=UTF8&qid=1306378019&sr=8-1
Click to expand...
Click to collapse
Scratch the hole 2 USB connectios theory, you cant combine 2 voltage from one power source in series. But i'm looking into what those dual cables actually do.
Someone should disassemble there Asus charger, i couldn't figure out how to pry it open, so i gave up before i broke the plastic shell
Someone needs to get an oscilloscope going on the cable , there has got to be a reason Asus chose USB 3.0 connectors, which i think it is for some accessories down the road, who knows
SlimDan22 said:
Someone should disassemble there Asus charger, i couldn't figure out how to pry it open, so i gave up before i broke the plastic shell
Someone needs to get an oscilloscope going on the cable , there has got to be a reason Asus chose USB 3.0 connectors, which i think it is for some accessories down the road, who knows
Click to expand...
Click to collapse
Not going to argue with you on that one. The dynex is working for people and so is my rig.
skchan2 said:
would something like this work to charge from 2 usb ports?
http://www.amazon.com/Apricorn-Power-Adapter-Cable-AUSB-Y/dp/B000JIOHDE/ref=sr_1_1?ie=UTF8&qid=1306378019&sr=8-1
Click to expand...
Click to collapse
That's not going to work because those cables are all in parallel, they increase the Amps not the voltage. The only way to increase the voltage is through series and you have 2 seperate power sources.
DevCake said:
That's not going to work because those cables are all in parallel, they increase the Amps not the voltage. The only way to increase the voltage is through series and you have 2 seperate power sources.
Click to expand...
Click to collapse
lol reading that made me feel like i was back in circuits I
Updated OP with parts needed to make a wall and car charger for under $14. Posting pics of custom versions made with spare parts.
DevCake said:
Updated OP with parts needed to make a wall and car charger for under $14. Posting pics of custom versions made with spare parts.
Click to expand...
Click to collapse
Thank you for this, awesome job. Its still a joke asus does have a supported one. I guess ill trade that for the fact the 3.1 update will be timely. These force closes are killing me!
unable to find
Hi Devcake
Icant seem to find the USB /power lead could you give another link please. I am in the UK.
Many thanks for your article just what was needed.
Carl
Ebay item #270571233814 is the 5.5 to USB adapter
UK_Computing_CablesConnectors_RL&hash=item20b735a891
Thanks for that, but not available for the UK. Will try on the UK site.
Many thanks
Carl
Nice guide. Added to ultimate thread. Have posted a warning too, as I can see people burning their houses down trying this out with no technical knowledge.
Once you receive the items and can confirm that this works, can you post the links to the items on ebay? Thanks a ton!
Hi all,
Just got my hands on my new Asus Transformer. Just getting to grips with the USB 3.0 charging problems, etc... Sorry for not reading through the other posts in there entirity, in a bit of a rush to go on holidays and need mobile charging!
I need to keep the device alive and charging in the car (kids, angry birds, i'm sure you understand!).
What can I use? I thought my 12v cigar to USB would work as with my old android phone, but it clearly doesnt as it doesnt charge while the device is on.
What are my current options for immediate purchase here in the UK?
Thanks in advance.
Hi
There are no options, at the moment, either here in the UK or elsewhere.....
....except if you make your own charger....cable.....trouble is that two things : first, the 40-pin proprietary plug that connects to the TF/dock; these are not available anywhere yet and secondly that regular 12v USB chargers do not chuch out anywhere near enough juice for the TF
ASUS UK are in the process of getting TF accessories available see here .... but that's it, unless you want to make your own.
Your only option right now is to get a Car power inverter and use the wall charger.
PhoenixFx said:
Your only option right now is to get a Car power inverter and use the wall charger.
Click to expand...
Click to collapse
Hiya, yeah, already got one of those but am looking for an aternative, have ordered a longer USB 3.0 lead so at least i can do that...
Thanks
kevpuk said:
Hi
There are no options, at the moment, either here in the UK or elsewhere.....
....except if you make your own charger....cable.....trouble is that two things : first, the 40-pin proprietary plug that connects to the TF/dock; these are not available anywhere yet and secondly that regular 12v USB chargers do not chuch out anywhere near enough juice for the TF
ASUS UK are in the process of getting TF accessories available see here .... but that's it, unless you want to make your own.
Click to expand...
Click to collapse
I'd definately have a go at making my own, if only I could get the connectors! As for the 12v USB adaptors, im sure I could make some mods to get enough power! ;-)
gavin watson said:
I'd definately have a go at making my own, if only I could get the connectors! As for the 12v USB adaptors, im sure I could make some mods to get enough power! ;-)
Click to expand...
Click to collapse
check out this post of mine in the "short cable" thread:
http://forum.xda-developers.com/showthread.php?p=16320775#post16320775
you can do it for about £27 with generally-available parts.
goes without saying i hope ---- triple-check polarities/ voltages etc. before plugging anything in!
poster bob smith42 has posted some useful guides.
theabsurdman said:
check out this post of mine in the "short cable" thread:
http://forum.xda-developers.com/showthread.php?p=16320775#post16320775
you can do it for about £27 with generally-available parts.
goes without saying i hope ---- triple-check polarities/ voltages etc. before plugging anything in!
poster bob smith42 has posted some useful guides.
Click to expand...
Click to collapse
To sum up that post, all you need is any car charger that puts out close to 15v at 2amps or more. Then you put a regular USB female port on the end of it (either through an adapter or by wiring it up directly). Then you use the standard ASUS cable to connect it to your tablet.
rtadams89 said:
To sum up that post, all you need is any car charger that puts out close to 15v at 2amps or more. Then you put a regular USB female port on the end of it (either through an adapter or by wiring it up directly). Then you use the standard ASUS cable to connect it to your tablet.
Click to expand...
Click to collapse
Most car's electrical systems are at 14-14.5V when the car is running. I've seen posts that say the TF will start charging at 11V, so even with the car off, there should be enough voltage to charge directly from the car's electrical system. Obviously a fuse is recommended, and voltage regulation would be nice, but shouldn't be necessary.
I haven't had the need to charge my TF in the car yet, but I plan to put a usb 3.0 socket in my car, and use a switch, or watch pin 7 for ground(or whichever it was, will double-check obviously), to toggle between a 5V supply and the car's 12V system.
Hi, thanks for the info. Do we know the pinout for the female USB socket? Thanks.
gavin watson said:
Hi, thanks for the info. Do we know the pinout for the female USB socket? Thanks.
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You'll be connecting ground to pin 4 and +11-15V to pin 1. Do not use with normal USB devices, it will supply the 11-15V to the same pin that normal USB uses for +5V, so it's a fairly certain instant-fry. Change pin 1 to 5V for normal devices. To switch between 5V and ~15V, I plan on using the same method the wall charger uses, watching for ground on pin 7(pin number needs verification). If you switch it manually, or don't switch at all, you can use a standard USB 2.0 socket instead of the 3.0(The pic is 2.0, 3.0 has 5 extra pins behind the first 4, there will be fewer pins to get in your way when soldering).
If you buy one of these http://www.amazon.com/Portable-Inve..._1?s=automotive&ie=UTF8&qid=1312550809&sr=1-1
Then just plug the Asus charging power block into that. This looks like the easiest solution right now.
You don't need a 175 watt one, that's just the first one i saw on amazon. The power block has a max of 2A rating with 15v so that is only 30 watts(v * a = w).
chatch15117 said:
If you buy one of these http://www.amazon.com/Portable-Inve..._1?s=automotive&ie=UTF8&qid=1312550809&sr=1-1
Then just plug the Asus charging power block into that. This looks like the easiest solution right now.
You don't need a 175 watt one, that's just the first one i saw on amazon. The power block has a max of 2A rating with 15v so that is only 30 watts(v * a = w).
Click to expand...
Click to collapse
Nice. Lots of 110v 75 watt items on ebay, too.
75W 12V DC To 110V/220V Power Inverter Car Adapter USB
Car AC Power Inverter 150W Pop-can 12V To 120V w/USBH42 (This one looks pretty cool in my opinion)
I have no idea if these will work with TF101. Has anyone tried yet?
It should work.
I used to have this one: http://www.amazon.com/Cobra-CPI-150-Micro-150-Inverter/dp/B000F6NULK/ref=cm_cr_pr_product_top
Small enough to carry around + airplane adapter.
An inverter is a good solution for charger the TF without much fuss. If someone wants to wire something directly to the cig lighter, be sure to unplug your TF when starting the car to avoid voltage spikes.
zepheris.hk said:
An inverter is a good solution for charger the TF without much fuss. If someone wants to wire something directly to the cig lighter, be sure to unplug your TF when starting the car to avoid voltage spikes.
Click to expand...
Click to collapse
Find one with high and low voltage protection and you don't have to worry about spikes.
tengtengvn said:
Find one with high and low voltage protection and you don't have to worry about spikes.
Click to expand...
Click to collapse
He said that in regard to directly wiring to the car's electrical system, not an inverter. Are you suggesting he buy a car with over/under voltage protection?
P.S. @ zepheris.hk
Since the TF expects 15V(and the internal regulator should be able to handle up to 37v for a couple seconds), I doubt you need to worry about spikes from a direct connection to the car's system. Besides, I've never seen a car that spikes when starting. You'd notice all the lights get brighter, instead of dimming as they normally do(from the voltage sag induced by the starter's amp draw). That isn't to say that there can't be other spikes if something is wrong with your electrical system though. I recommend a resistor to limit amperage at the very least, if you're brave, the internal regulator should be able to handle any over/reverse voltage(within reason) as long as there's current limiting.
Bob Smith42 said:
Nice. Lots of 110v 75 watt items on ebay, too.
75W 12V DC To 110V/220V Power Inverter Car Adapter USB
Car AC Power Inverter 150W Pop-can 12V To 120V w/USBH42 (This one looks pretty cool in my opinion)
I have no idea if these will work with TF101. Has anyone tried yet?
Click to expand...
Click to collapse
110v inverters are all the same, basically, so as long as it meets your wattage requirements(30W) it will work. I suggest 90-100W though so you can charge a laptop also, if needed. Most laptops are 60-100W.
My experience so far...
Yesterday on a long journey I used a 175w 12vdc - 230vac inverter with the original mains adaptor that comes with the TF. Can't link to the inverter, I bought it a while ago from Maplin (UK) and hadnt used it.
All worked fine.
The TF AC adaptor got a bit warm, slightly more than usual, but nothing to get worried about. The charging went fine, I couldnt use it permanently connected and in use because of the stupid length of the cable and my 3.0 USB extension hadnt arrived before we set off.
I've just bought another 3.0 USB cable and a cigar lighter plug and will attempt to connect it up by using the (approx.) 13.8vdc directly from the cigar outlet in my car. I can't see why that wont work?
I might just wait until the warrantly company confirm my TF is on their database before I attempt this, but will post back soon.
Thansk for all the tips and info guys.
gavin watson said:
My experience so far...
Yesterday on a long journey I used a 175w 12vdc - 230vac inverter with the original mains adaptor that comes with the TF. Can't link to the inverter, I bought it a while ago from Maplin (UK) and hadnt used it.
All worked fine.
The TF AC adaptor got a bit warm, slightly more than usual, but nothing to get worried about. The charging went fine, I couldnt use it permanently connected and in use because of the stupid length of the cable and my 3.0 USB extension hadnt arrived before we set off.
I've just bought another 3.0 USB cable and a cigar lighter plug and will attempt to connect it up by using the (approx.) 13.8vdc directly from the cigar outlet in my car. I can't see why that wont work?
I might just wait until the warrantly company confirm my TF is on their database before I attempt this, but will post back soon.
Thansk for all the tips and info guys.
Click to expand...
Click to collapse
Like I said, the cigar outlet should work fine, but you don't need a 3.0 cable, you can just use a 2.0 to simplify the wiring, and using a 3.0 cable won't protect other devices from overvoltage anyways.
I recommend a 7.5 Ohm resistor to limit the amperage to 2 amps: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=TR50JBD7R50-ND
This one is a 50W, so it should be able to handle 2 amps without heatsinking.
Long term, I'd suggest adding a decoupling capacitor to get rid of some of the noise from the car's electrical system, something like:http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P12389-ND.
For just one trip though, you should be fine without any added protection. I would suggest the resistor though, as the outlet will give it up to about 10 amps, and I don't know if the internal regulator in the TF is limited by itself, or by the charger(which only puts out 2 amps). If you don't use a resistor, watch the battery/case temperature like a hawk, especially when the battery is being charged from a very low level(0-25%), this is the highest draw portion of the charging cycle, and consequently, the hottest.
Transformer needs 1.5A output cigarette lighter. If you can find one, you're golden.
Anyone been able to find a genuine Asus Car charger? I have several DC to USB adapters but when I plug them in the Prime doesn't register a charging battery. There are after market ones but I'm afraid they may not work like the ones I have tried.
Most car chargers are in the 5V range, while the Transformer Tablets need a 12V charger. Not sure where to find those though, but I've never looked. I just use an inverter and whichever AC charger I need if I'm in need of power.
http://www.amazon.com/gp/product/B005L8Q4VU/
I purchased the one from Amazon and when I plug it into my Prime, the prime locks up. Has anyone else encountered this?
jjon90 said:
Anyone been able to find a genuine Asus Car charger? I have several DC to USB adapters but when I plug them in the Prime doesn't register a charging battery. There are after market ones but I'm afraid they may not work like the ones I have tried.
Click to expand...
Click to collapse
The Prime needs 15v in order to register charging status. Most care adapters will only deliver 5v since that is the voltage expected by most USB devices. The Prime will charge from 5v however the device will need to be completely turned off, and it will take a long time (~20ish hours) to go from depleted to full charge.
I don't know if there are any 12v to USB adapters that will really meet the power requirements for full-charging the Prime because the Prime's power requirements are fairly unique. If you really need to charge your Prime from your car you might be better off using the Prime's normal charger with something like this: http://www.amazon.com/BESTEK-inverter-motolora-blackberry-notebook/dp/B003Q54V88/ref=pd_sbs_sg_1
They are available on ebay, you will probably have to import one from hong kong, it is essentially a 12V to usb adaptor, the one I bought was packed with a asus plug aswell. It puts 12volts onto the usb adaptor.
The prime does not need 15V to charge, it will charge at about 11.8. Mine charges fine in my car with the engine running i.e alternater putting out 13.2 volts but the prime starts spitting a dummy when the engine stopped as the battery voltage is right on the threshold. The only way around is to shut down the prime before stopping the engine and then it will happily continue charging on ~12 volts.
The Prime requires 15v to charge at a normal rate. It will charge at 12v albeit at a slower rate. Normal USB output is 5v.
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Hence this one feeds 12V to usb rather than 5V
billhm said:
I purchased the one from Amazon and when I plug it into my Prime, the prime locks up. Has anyone else encountered this?
Click to expand...
Click to collapse
Yes, I bought the same one and my Prime locks up and reboots a few times. Never tried it again after it did that.
I played around with the cable which came with the car adapter and found that it would not work with the transformer prime. I hope to test the cable with came with the TP and the car adapter. Will report my findings later.
billhm said:
I played around with the cable which came with the car adapter and found that it would not work with the transformer prime. I hope to test the cable with came with the TP and the car adapter. Will report my findings later.
Click to expand...
Click to collapse
I did this test this morning (using actual asus cable) and my Prime just went into a reboot loop. i was able to get it back after a while. I'm returning mine. I don't think this item should be on the accessory list. Unless i just got a bad one...
jjon90 said:
Anyone been able to find a genuine Asus Car charger? I have several DC to USB adapters but when I plug them in the Prime doesn't register a charging battery. There are after market ones but I'm afraid they may not work like the ones I have tried.
Click to expand...
Click to collapse
I hacked one together based on this thread: http://forum.xda-developers.com/showthread.php?t=1087321
I used the 100W transformer pictured towards the bottom. It also has a regular USB so I can charge two things at once.
I'm glad I carry a dc-ac converter in my car. Just need to get another cable / adapter.
curreyr said:
http://www.amazon.com/gp/product/B005L8Q4VU/
Click to expand...
Click to collapse
This is the one I bought. Won't charge the Prime, but will charge the dock alone.
Is there anything special about the USB cable and wall charger that came with the Atrix 4g?
The cable isn't long enough and I need to find one that is at least 6'.
not at all. it's just a standard micro usb cable.
Beware of other phone chargers with mini usb though. The atrix is much more greedy than my wife's lg clamshell and it won't charge from that charger. It turns on but never actually charges.
Matt
Sent from my MB860 using XDA App
not at all. it's just a standard micro usb cable.
Click to expand...
Click to collapse
The cable yes, the charger itself, no.
I got a generic one from [a national store] and it charges but locks up the phone while charging.
So apparently there are differences.
I've used the USB cable from an HTC, a Samsung, and a Blackberry. All worked fine. Take apart a cable and see what's inside of it - I think you'll find they're all the same.
Universal Serial Bus is a standard. In Europe that means that all USB wall chargers have to be more or less the same. I use an Amazon Kindle charger with my Atrix just fine. Have also previously used chargers from other Android devices, WP7 devices and Blackberries.
In short, you'll be fine.
mattaw2001 said:
Beware of other phone chargers with mini usb though. The atrix is much more greedy than my wife's lg clamshell and it won't charge from that charger. It turns on but never actually charges.
Matt
Sent from my MB860 using XDA App
Click to expand...
Click to collapse
well, yeah. you'll find it won't fit and won't charge if you're trying to use a mini usb cable.
Fair point, I did name the wrong connector. In my defense the USB guys do mess with their connector names and types all the time.
A charger with exactly the same plug (from an lg clamshell) failed to charge my atrix but did turn it on.
Matthew
Sent from my MB860 using XDA App
All proper chargers work fine on mine!
DON'T use cheap 1$ china chargers! They often have badly stabilized voltage and can even destroy your devices!
While on devices with proper stabilisation the voltage should look like the topmost graphic on this image (even under full load), on cheap devices it often looks like the one on the bottom, or something inbetween!
Also, some very cheap chargers allow the device to draw too much current, while grilling some internal components of the device. This could even start a fire!
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For cables, you can use the cheapest! I never had a cable break in a way it could destroy anything besides itself, and I always buy cheap cables from www.dealextreme.com!
I can recommend this cable. Very solid build quality, better than most cables for 10€ around here!
Any of the usb wall chargers advertised for iPhones will work. I found an awesome one for my car by looking the in apple section at walmart.
I order nearly all cables from monoprice.com super duper cheap and they always work just fine. You can get a micro usb for less than a dollar.
I just use a chargers off monoprice. Super cheap adapter and cable.
My friend's galaxy charger fits, but does not charge properly. About 10% per hour.
Sent from my MB860 using Tapatalk
Note that many power supply with 500mA or less ampere power WON'T charge your phone, be sure that your new charger is at least an 850mA.
SystemR89 said:
Note that many power supply with 500mA or less ampere power WON'T charge your phone, be sure that your new charger is at least an 850mA.
Click to expand...
Click to collapse
Funny, my front-mounted USB ports (which put out just about 500mA) do a fine job for most devices including my Atrix. However, do not try to charge from dead via USB. For that you really need the full-power AC adapter. I use one from a previous phone at work (Samsung I think) and it charges in no time.
cable any micro USB cable will do. I have been using the cable that came with my kindle since I got the phone. The cable that came with my phone I think is in my car and the some random 3' cable in my bag for my computer. They all work fine. As for charging the computer and car USB is very slow as the only put out about 2.5 watts. The one that came with our phone puts out a little under 5 watts.
I always buy Monoprice cables. Although I have to admit the 1" micro usb cable I had been using from them seems to be broken as the cable will or will not charge depending on how its folded. But for the $1 or whatever I paid for it, it lasted a long time.
---------- Post added at 01:19 PM ---------- Previous post was at 01:13 PM ----------
Almost forgot...I've been using the ipad wall charger. It's a 2amp charger and charges the phone extra fast. I've been meaning to look for car cigarette lighter to usb chargers that are intended for ipad so I can have that 2 amps available for any device.
Just for information.
I recently bought HTC Evo 3D for my wife and installed a self-made 5V/3A charger in her car. The charger converts 12V in-car to 5V/3A stable.
I immediately was stuck with a problem. Whenever I put her Evo 3D it charges nicely. But my Atrix don't.
I remembered there is something special in Atrix USB toward charging. I checked and found that adding 10K resistor between white (receive or transmit?) and red (+5V) wires let my Atrix charges as it should be.
10K resistor has no effect in HTC.
From what I know it is just a standard Micro USB, the usb to outlet adapter, I am not sure, but it looks like a fairly standard device.
Caebron said:
The cable yes, the charger itself, no.
I got a generic one from [a national store] and it charges but locks up the phone while charging.
So apparently there are differences.
Click to expand...
Click to collapse
Good to know I'm not the only one that has this problem, thought there was something wrong with my handset.
I've seen a little chatter on the New Trent battery packs, but haven't seen this issue, so I wanted to see if I can figure out what's up.
I've had the IMP500 (5000mAh) for 3 or 4 months and really like it in general. Well, the little micro USB adapter has a little too much play and after 30 or so plug ins and outs it has a hard time maintaining a connection, to the point where it's almost unusable.
When I use the included wire, it shows up as AC charging. But, if I use a 'real' USB cable, it shows up as USB... which as we know can't provide a positive charge while using.
I know about the whole shorting of the 2/3 pins to force an AC charge, and I can see the mechanics that give me AC with the New Trent wire. But it would appear that I'm out of luck without getting a new one of those.
Anyone know of a USB wire that will force AC charging?
a-jive said:
Anyone know of a USB wire that will force AC charging?
Click to expand...
Click to collapse
No, because any cable that shorts 2-3 isn't a USB cable, just as a charger that doesn't isn't a USB charger. They simply don't meet the specifications. If they're labeled "USB" anything, call the manufacturer and complain.
yes, a USB charging ONLY cable: available here:
http://www.amazon.com/Naztech-Micro...BCAY/ref=sr_1_1?ie=UTF8&qid=1331144352&sr=8-1
the reviews on there matchup to what we want... a usb format cable that is shorted for 'charging only' it won't work for data.
thatsricci said:
yes, a USB charging ONLY cable: available here:
http://www.amazon.com/Naztech-Micro...BCAY/ref=sr_1_1?ie=UTF8&qid=1331144352&sr=8-1
the reviews on there matchup to what we want... a usb format cable that is shorted for 'charging only' it won't work for data.
Click to expand...
Click to collapse
Amazing, thanks! I hunted amazon but didn't come up with that one. I'll have to try it out.
thatsricci said:
yes, a USB charging ONLY cable: available here:
http://www.amazon.com/Naztech-Micro...BCAY/ref=sr_1_1?ie=UTF8&qid=1331144352&sr=8-1
the reviews on there matchup to what we want... a usb format cable that is shorted for 'charging only' it won't work for data.
Click to expand...
Click to collapse
Got this today and it works like a charm. No more soldering together pins in old i-pod chargers for me. Thanks again for the lead.
just bought two of each of these, should get early next week:
http://www.ebay.com/itm/370592797323?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
http://www.ebay.com/itm/170793148690?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
hope these cure my car charging woes lol
One can buy chargers from reputable companies which follow the USB charging specification for under $10 (car or AC). Why mess with non-standard chargers and cables which are no cheaper, from bit players?
Back when I got my Dinc, I bought like 10 of these, they were actually on special for like $2.99 ea.. they are now close to $5 (amazon prime free shipping).
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http://www.amazon.com/gp/product/B001P05K9K
I bought the other day one of these the other day as I didn't have a Car charger...
http://www.amazon.com/gp/product/B002TOKTHO
< $3.50 with free shipping (not amazon prime).
I had a meeting the other day and I ended up connecting my Rezound using one of the cables above with the charger above and got AC charging indication on the phone when it was charging.
Works great.
I also have 4-5 of these around the house ... Not phone related
http://www.amazon.com/gp/product/B0037G2BMY
I use them when "family" comes over with their broken desktop computers and need me to "fix" them. Instead of stringing them to my office, I just plug one of these in and Wifi them so that I can work on them remote from my notebook. They are like $8 and work great.
Hello,
where to find this "Naztech Micro USB Charging Cable" for delivering in Belgium (europe). It's on amazon.com but delivery is only US and CANADA
Or do you know another cable wich deliver full power as with wall charger and original htc cable (about 850ma)
Thank you.
thatsricci said:
yes, a USB charging ONLY cable: available here:
http://www.amazon.com/Naztech-Micro...BCAY/ref=sr_1_1?ie=UTF8&qid=1331144352&sr=8-1
the reviews on there matchup to what we want... a usb format cable that is shorted for 'charging only' it won't work for data.
Click to expand...
Click to collapse
Also:
http://www.amazon.com/Charge-PureGe...1&sr=8-2&keywords=charge+only+micro+usb+cable
Yes but is there another shop for delivering in Europe?
Yannick1988 said:
Hello,
where to find this "Naztech Micro USB Charging Cable" for delivering in Belgium (europe). It's on amazon.com but delivery is only US and CANADA
Or do you know another cable wich deliver full power as with wall charger and original htc cable (about 850ma)
Thank you.
Click to expand...
Click to collapse
The review on the following url from 24 Nov 2011 indicates it's charge only multi adapter cable:
http://www.amazon.co.uk/HEAD-MULTI-...PZB8/ref=sr_1_1?ie=UTF8&qid=1343570862&sr=8-1
Luck
I don't know if the seller will ship internationally, but this is the one I bought and it works great.
http://pages.ebay.com/link/?nav=item.view&id=140750149487
It's worth hitting him up and seeing if he'll send it to you.
from my ADR6425LVW using Tapatalk 2
Ok thank you but I bought this one
Htp://usbfever.com/index_eproduct_view.php?products_id=1746
hope it will work fine.
Have you guys heard of Mediabridge? I got one of their ethernet cables, but now it's the only brand I buy when it matters. If anyone is still looking for a charging only cable, they have a long 6 ft. cable and a coiled cable - though they do have sync cables with the same stats too (and cheaper).
Here are the charging only cables from Amazon:
Oops, I guess I do too much lurking and not enough posting because it tells me I can't post outside links until I've had 10 submissions.
Simply do an Amazon search for Mediabridge USB Charging Cable and they should be the first 2 results that show. You can compare them with the data/sync cable because the data cable is a single color where the charging only has a dark cable and light grey terminals.
If you're interested in the data/sync cables you can find them under Mediabridge Hi-Speed USB 2.0
If you're using a wall charger or a car charger, either modify the cable (not ideal) or the charger itself (more ideal) to short the D-/D+ pins. When the phone detects the data pins shorted together it assumes it's connected to an AC charger. If you do this to a cable, make sure that only the micro-USB end is shorted and cut the wires so the USB A end isn't shorted.
Many PC USB ports are limited to 500mA draw anyway.