yashsingh1/xdaforums huggingface dataset:
[Eee Pad Transformer Accessories] miguelantonio:
Sorted.Bought a generic charger as stated in the first post from the uk plus the 5.5mm female barrel adapter and it works a treat.Second Travel charger is bagged and ready.Thanks for all your help and advise.
[Eee Pad Transformer Accessories] evening2005:
Thanks for the tip. I just bought one of these and it works perfectly. Now, so long as nothing happens to my £0.50p cable, my £430 device will be fine!
[Eee Pad Transformer Accessories] boogiemaan:
Power supply

I ended up using the power supply for my eeePC. That's 12V 3A. It's working just fine.:D
[Eee Pad Transformer Accessories] JimInWoodstock:
Charger is "smart"

After reading through this topic, there seem be still be some confusion about how the transformer and it's charger works. DevCake has done a great job with figuring out how this all works. The following is my attempt at an explanation of the transformer charger. It is based on DevCakes work in this topic.

The ASUS charger is "smart". It can supply 5v (standard USB voltage) to a USB device like a phone. It can also supply 12v-15v to the Transformer which is what it needs to do a fast charge. This smart feature is needed since the socket on the charger is a standard USB and any device with a USB cable can be plugged into it. All those devices, except for the transformer, require 5v to charge. So there has to be some way for the charger to know what kind of device is plugged in, either a standard USB device or the transformer. If the charger was designed to output the 12v - 15v all the time for the transformer and you connected a phone to the charger, it would fry the phone since it is designed to be charged by a 5v source.

The charger uses one extra pin in the USB cable to control this. This pin is only available in USB3. Inside the transformer, that pin is connected to the ground pin. If the transformer is plugged into the charger, it detects that the extra pin is grounded, and supplies 12-15v to the transformer. If a phone is plugged into the charger, which does not have the extra pin, the charger provides 5v to that device.

DevCake's power supply outputs the 12v all the time and therefore does not need this extra wire in the USB cable. That is why a USB2 extension cable will work. The downside, if there is one, is that you can never plug anytyhing into this charger that requires 5v. It would be fried by the higher voltage.

I hope that this explanation will help those that are still confused about this project.
[Eee Pad Transformer Accessories] deadman3000:
It helps explain but I have an issue. Earlier I pointed to a 15v 2a adapter I can purchase from Ebay. This they said would work great along with the USB adapter. However the rating on the offical charger is from 12-15v. I take it that the official charger auto switches between 12-15v in such a way as to prevent overload? If I were to plug a straight 15v 2a charger into the TF or TF dock (or both connected) would this not be pushing too much voltage? Otherwise why is the TF charger 12-15v and not just 15v?

Hope you can clear this up as I do want to buy the Ebay charger and USB adapter but I am concerned about frying my TF and/or dock with a continuous 15v.
[Eee Pad Transformer Accessories] JimInWoodstock:
could be a problem

The power supply that you are interested in is probably ok. Almost all power supplies vary their voltage somewhat. This is due to the amount of current being pulled by the load. The supply that I am using is labeled 12v @2.1 amps. If I measure the voltage with nothing connected, it measures 14v. That is because is nothing connected so there is no current flowing and the voltage will always be a little more than the rated voltage. I am guessing that the supply that you are looking at is going to supply 15v when used with a light load and 12v when used with a load that is near its maximum amp rating.

This brings up a little explanation of amps.

The amp rating on the supply is the maximum amps that the supply will deliver. The actual amps drawn by the load is strictly determined by the load. If a load was connected that only drew 1.2 amps from the supply, then my 2.1 amp supply would be "coasting". So when choosing a power supply, you want to shoot for a 12v supply with an amp rating of at least 1.5 amps. The voltage is important, but the amp rating is not as long as it is at least 1.5 amps.

Please post a link to your supply on ebay and let me take a look at it.
[Eee Pad Transformer Accessories] Bob Smith42:
The official charge label says 5v-15v, not 12v anywhere. :)
[Eee Pad Transformer Accessories] JimInWoodstock:
voltage

yes, the official charger says 5v-15v. According to the earlier posts from DevCake,

any voltage greater than 11v will work. However, I would be concerned about using a charger that was labeled 15v. There is a good chance that with a load less that the stated maximum load stated on the charger, the voltage could rise above 15v. There are plenty of 12v supplies available. These are much more prevalent than 15v supplies. By using a 12v supply, which is above the 11v that DevCake states as the minimum voltage, you have a 3v cushion in case the supply is not loaded heavily enough and the output rises a little past 12v.
[Eee Pad Transformer Accessories] Bob Smith42:
I tested the DX-UA output at 14.8v with multimeter, no load. It works great, but anything providing 15v (or 12v) via a female USB socket is a danger to your other electronic devices. I would agree that anything used, not from ASUS, should be tested with a meter first.

I found an auto adapter plug rated to provide 12v, it physically gives 5.5mm barrel plug socket. But, it was wired very strange with zener diode (zd) in series backwards on the positive lead. The zd breakdown voltage was 10v at low amperage (150ma?), and it was in series backwards on the positive lead. I thought (naively, not an ee so I am likely wrong) zener diodes should shunt from positive to negative, but not this one. The result was to drop the 13v auto voltage to a trickle charge at 9.8v and .1 amps that did not effectively charge the tablet. And, it got hot. Testing is important. LOL
[Eee Pad Transformer Accessories] sheshankj:
Will this work?

h t t p://cgi.ebay.c o.u k/ws/eBayISAPI.dll?ViewItem&item=330561679160&ssPageName=STRK:MEWAX:IT

(please remove spaces..I am not allowed to post links)

This supplies 12v/2A and 5v/2A...can I solder 2 female USB (ground common)? If yes, will it charge the transformer and another standard 5v USB device(not bothered about 5v charging)? Its cheap at £2.20 delivered as well.
[Eee Pad Transformer Accessories] JimInWoodstock:
That supply should work

Sounds like a good supply deal. I would be very careful and label the 2 outputs very well. You don't want to plug a phone into the 12v connection by mistake. This charger on ebay looks perfect for the job. I would prefer a "wall wort" that plugs directly into the wall, but this seems perfect as far as the power specs and the price is right.
[Eee Pad Transformer Accessories] JimInWoodstock:
My supply

BTW, the power supply that I am using is labeled 12 V at 2.5 A and works very well charging the transformer. It seems to charge the transformer faster than the OEM charger but I'm not sure since I haven't really run any tests.
[Eee Pad Transformer Accessories] deadman3000:
I already posted it.

http://cgi.ebay.co.uk/BRAND-NEW-15V...K_Computing_Networking_SM&hash=item35adf0ce5d
[Eee Pad Transformer Accessories] JimInWoodstock:
Other supply is a better deal

The power supply referenced in the post 214 looks like a better deal. It supplies both 12 V and 5 V and will charge both the transformer and a standard 5v USB device at the same time if it is wired up with 2 usb female connectors. The price is much less and the supply takes a regular PC power cord which is an advantage and it is also available in the UK.
[Eee Pad Transformer Accessories] deadman3000:
I want a wall wart type and also wanted 15v for fast charge.
[Eee Pad Transformer Accessories] carlvk:
noob no link .amazon.co.uk/Output-Universal-REGULATED-SUPPLY-1500mA/dp/B0054QAKS2/ref=reg_hu-rd_add_1_dp

I think this one should do the job without solder?

BTW every one of my switched 12v adaptors changed to 18V after modification. this one says its regulated so that shouldn't happen right???
[Eee Pad Transformer Accessories] markntravis:
It is fused. Read the description.
[Eee Pad Transformer Accessories] rtadams89:
It seems there is some confusion about amps. The original charger is rated at 15volts/1.2amps. Therefore, any adapter you get that is rated at at least 1.2amps will be fine. Due to the variations in quality for cheap adapters, I would suggest going for one that is rated at 1.5amps to be on the safe side.

The important thing to note, is there is no such thing as "too many amps". You can safely use an adapter that was rated 15volts/1000amps. This will not fry your Transformer. The only two downsides to a higher amp charger is that it will probably be bulkier and if the output gets shorted, the cable and transformer are more likely to get dangerously hot. But again, yoru Transformer won't be put in any danger.
[Eee Pad Transformer Accessories] terrytpot:
grim tidings,whilst my copy worked flawlessly, accidently plugging it into a 24v socket in my truck (instead of the 12v one its next to) appears to have fried something as it no longer charges and now wont turn on at all as the battery has gone flat :( here's hoping it's not too terminal for Asus to sort out..
[Eee Pad Transformer Accessories] fpdragon:
I also made some test with the charging problem of the Transformer and had a strange effect. The goal is to charge it in my car.

Took the original USB 3.0 cable and one USB 2.0 female connector I had.

Connected pins 1 and 4 to my labratory power supply (2A max) and started with 5V.

As expected nothing happaned, about 0A.

I switched off the tablet and rose the Voltage to about 13.5V.

The tablet seemed to load with 0.8A.

Then I started the tab and it was showing that it gets loaded (at 0.95A). Fine!

Then I pulled the connector and the tab stopped charging (^^).

So far so good.

After a few minutes I connected it again with my setup while the tab was running. Now there is a strange behavior:

* The tab says that it isn't charging and after some minutes I was able to confirm this by seeing the battery looses.

* Current is at 0.3A and the analog ampere meter pulses with it's needle slightly with a clock of about half a second.

*** Update here ***

I noticed that a third party widget says that the tab gets charged. Only the symbol in the task tray isn't noticeing the cable. Anyway the stange 0.3A stays to be strange...

*** Update stop ***

When I shut down the tab the current rose to about 0.8A (it seems to load again).

When I boot the tab I got the 0.95A as expected and it was loading again.

So to sum it up:

The charging with pin 1 and 4 works only if the tab was switched off when connecting the connector.

Thats a problem for me because I want to use the ignition line from the car to switch the charging of the tab. the tab itself should always booted and only be charged when the car is started.

Can somebody confirm this behavior?

Any idea what could be the cause?

Something with the USB 3.0 pins to sense a command for power connected?
[Eee Pad Transformer Accessories] tengtengvn:
My DIY charger using an old 12v adapter and a Male-Female USB extension cable I have at work.;)
[Eee Pad Transformer Accessories] tobbik:
Soure/circuit city DC adapter works too

reading this thread and seeing the adapter displayed by the OP I thought that thing from thesource.ca (productID=2738867 can't post links yet) looks the same so It may just work.

So I obviously didn't read the fine print because it is 1.5-12V and not 15-30V. However, I'm happy to report it works, plus, selecting 5V instead of 12V output it manages to charge my phone as well as my camera. As an all in one USB charging solution I can recommend this thing. I will take it on the road next month and report back.
[Eee Pad Transformer Accessories] fpdragon:
Hi again!

I did more investigation on the problem above. Seems that I found a solution.

Seems that the tablet has two different sensing modes for detecting a power supply. If the tablet is turned on it pulls in about 500ms interval on the USB power with a high load. If the voltage drops while this, you see the effect I described above. If the power supply has an output capacitor which is high enough, you won't see any problem. I expect that this 500ms sensing thing can have a load around 2A or higher since I had troubles with my 2A lab power supply at home. Or maybe my "no name" power supply is not good enough and has not enough power.

With a more powerful supply at work with a larger output capacitor everything worked fine.

Anyway, my conclusion is that we have to have a good shielding. This 500ms power pulses could lead to high interferences on other devices.

PS: Those who had problems with their setup, try to put a large electrolyte capacitor between the power output (watch out for polarity). Maybe this helps that the tab can detect the power supply.
[Eee Pad Transformer Accessories] chocobill69:
Novodio PureWatt Ultra 11 000 mAh

Hello,

Will this one work ?

Novodio PureWatt Ultra - 11 000 mAh

Sorry i can't post link...
[Eee Pad Transformer Accessories] fpdragon:
"Voltage	3.7 V"

I'd say no. Maybe with black screen and very very very very slow but I don't think so. You need at least 11V which isn't the standard USB voltage (5V). So I don't think any third party USB loader would be compatible to the transformer without a hardware hack!
[Eee Pad Transformer Accessories] blackssr:
18000 Mah for the " User on the Go"

Hello All,

New here but I figured I would share my experience with the Energizer XP18000 Portable battery.

I made this custom cable from the cable part # WI-12 from Xpal. It was $ 6.99 US. It steps downs the output of the XP18000 from 16-19 volts to a solid 12.3 volts.

I tested over the last several days and found the following results:

1) The XP18000 can fully charge the Asus TF from a dead battery to full in 2.75 hours.

2) The XP1800 can charge the Asus TF 2.5 times before needing a recharge itself.

3) If both the XP18000 and the Asus TF are fully charged you can get approximately 23 hours straight usage out the two before both batteries are completely spent. (Auto Brightness, Wifi on and a movie playing.)

I hope this helps some of the road warriors like myself out there.

Mike.
[Eee Pad Transformer Accessories] scottmog:
Now this is freaking awesome
[Eee Pad Transformer Accessories] CCallahan:
Just FYI.......my charging cable went bad on me. From what I have read in this thread and searched for on Google there still is no generic replacement to be had.

Anyways, I was lucky and actually found an ASUS charger in stock at my local Office Depot for $29.99. As far as I can tell there is no one else in town that stocks it (Best Buy, ToysRUS, Radio Shack, Target, etc) which is silly since almost all of them sell the tablet.
[Eee Pad Transformer Accessories] CCallahan:
Very sweet. Wonder what the chances of that dongle working with my Splash Intense 5400? Currently they don't have an end to fit the TF which sucks.
[Eee Pad Transformer Accessories] rmriggin:
Does anyone know if a powered usb 3.0 hub would work for charging?
[Eee Pad Transformer Accessories] msticninja:
It shouldn't, AFAIK. USB 3.0 Hubs aren't designed to switch pin 1 from 5V to 15V when pin 7 is grounded.
[Eee Pad Transformer Accessories] msticninja:
Your Splash only puts out 5V. You'd need a boost voltage regulator to pump it up to 12V, but it would probably only charge the TF 25% or less on a full Splash charge. I could do the math based on an 85% efficiency regulator if you really want, but I'm pretty sure it would be less than 25% of the TF's total capacity.
[Eee Pad Transformer Accessories] blackssr:
I do not think the SI 5400 will work. It only has 5.0 volt outputs.The TF requires at least 11.0 to begin quick charging. The XP18000 has a 16-19 volt output. This is why the willy cable is required. It steps down the voltage to a steady 12 volts.
[Eee Pad Transformer Accessories] G'Kar:
ASUS charger and cable in stock - UK

I know its not 100% on thread but Asus uk shop has the charger and cable in stock now for £24.99 with a free delivery offer. Ordered one this afternoon and already got the confirmation that its been shipped. Not bad when you consider it includes the very rare USB cable.

The link is //shop.asus.co.uk/shop/gb/en-GB/Home/3-Accessories/11-Batteries--Powers/88-Adapters/90-XB2VOKPW00010Y-ASUS-Eee-Pad-Transformer-TF101-Adapter-%28with-EURO--UK-Plugs%29.aspx
[Eee Pad Transformer Accessories] archie_658:
Ready made USB/universal adapter, European version:

http://blue.bandridge.nl/products/p...iversal/1500ma_universal_adapter/general.html

You can change the voltage to 12V, but it doesn't let you switch the polarity for USB. Rated at 1500 mA. Long cord (simple twin cable). Works better for me than the USB 3.0 extension cable.
[Eee Pad Transformer Accessories] 321eod:
Nice idea - I'm looking at the transformer and travel a lot so this would work - has anyone else tried it successfully?
[Eee Pad Transformer Accessories] azizmulhim:
Does this chrager works for TF without tempering.
[Eee Pad Transformer Accessories] msticninja:
As we said, the Splash will not work. It's only 5V, and has a quarter of the capacitance of the TF. Read the rest of the posts to see the energizer that will work, or buy/build a 12V battery backup/charging system.
[Eee Pad Transformer Accessories] msticninja:
By tempering I'm guessing you mean soldering. No soldering is required. Put on the USB tip and set the charger to 12 volts. Do not plug in any other device while it is set to 12 volts!!! Normal USB devices use 5 volts.
[Eee Pad Transformer Accessories] azizmulhim:
Thanks. I am checking their site but it seems there is no online shopping.
[Eee Pad Transformer Accessories] Xxq TZ pxX:
So I bought the Dynex universal charger. Without using the voltage switch, the stand-alone wall plug puts out 15v. If I buy this and connect my TF straight to the 15v wall adapter without the switch, is it safe?
[Eee Pad Transformer Accessories] Odinbear:
Cool

Neat Solution, :cool:

Only hope that nothing goes wrong with that as in the UK its priced at £189.99 with free delivery from Amazon but with a 1 to 2 month delivery time, :(

And its portable, however only slightly more expensive than the ausus home charger and cable. Why oh Why couldnt they have used a standard connector/charger..

Still its an interesting idea and might lead others on the right path. :)
[Eee Pad Transformer Accessories] Bob Smith42:
It works great. I got same thing and use as my home charger at my desk. Yes it is safe, but ONLY for transformer tablet.

The main issue should be fear of plugging in another USB device (not ASUS Transformer) because almost ALL other USB devices require only 5v. So, I suggest you clearly label that connector to prevent a mistake.

As mentioned by DevCake, the TF proprietary cable and adapter use USB 3.0 socket and plug, where the extra pin 7 is used to signal a TF is plugged into the ASUS wall plug. This activates the 15v charging circuit in the ASUS wall plug, but otherwise it only provides 5v.

I believe the ASUS wall plug with this *magic* 15v switching ability is *more* proprietary than the 40 pin cable, because we might find 3rd party 40 pin cables someday, but I doubt we will ever find a third party 5v to 15v switching AC adapter based on pin 7 of a USB 3.0 socket. Yikes! :eek:

UPDATE: Also it took nearly a month to receive my adapter cable from China, good luck with delivery on yours!
[Eee Pad Transformer Accessories] Xxq TZ pxX:
Thanks, I'm ordering it now. Can't wait to try this out next month!
[Eee Pad Transformer Accessories] Delecron:
Anyone know if there is a touchscreen issue while charging? I have an inverter in my car with the stock charger. When its plugged it the touchscreen fails to work 99% of the time. I want to assume its the ****ty grounding of the inverter.

Can anyone confirm if this method causes that as well?

Thanks
[Eee Pad Transformer Accessories] msticninja:
Nobody has reported problems so far. Inverters have to make their own sine wave to turn AC into DC. When they do, it's a very squared sawtooth instead of an actual sine wave, so the device plugged into it will have to dump the power from the corners of the sawtooth somewhere, to attain a more true wave. This plays havoc with sensitive electronics, and creates a lot of RFI. Plug a pair of powered speakers into an inverter and you'll probably hear alot more interference than normally.

AC->DC converters just reject half of the AC current's sine wave with diodes(then step it down with a transformer) to create DC, so there is much less RFI. Besides, the stock Asus charger is an AC->DC converter, and it doesn't cause any issues. There's not much chance of another AC->DC converter being unsuitable.
[Eee Pad Transformer Accessories] mrg2003:
tf101 charger and cables arrived

cable asus part 14G000516300 $11

charger asus part 04G26E000101 $22

UK adapter PART NO UNKNOWN SEE BELOW

together

Question

Where can I buy the UK, US and European adapters ?
[Eee Pad Transformer Accessories] newtonc:
i have a 12v 1a ac adapter with a barrel point, and a female usb. can't wait 1 month for the 5525 to arrive from postal service.

how do I do the soldering? what goes where. i do have experience in soldering, but this i don't know. thanks
[Eee Pad Transformer Accessories] Bob Smith42:
Are you in USA?
[Eee Pad Transformer Accessories] tobordeadmeat:
Would this work (or fry...)?

Would a 15v car adaptor work (with a barrel to usb adaptor), or would it fry the transformer? I'm far too scared to try one!

I would have posted links, but aren't allowed to :-(

Search ebay for "15v car charger"
[Eee Pad Transformer Accessories] nickfielibert:
EEE tansformer with 12V 1Amp charger

Just wanted to let you all know, a simple charger 12V/1 A output with a female USB connector with pin 1 and 4 connected to the 0 and 12V leads from the adapter (make sure you have the right polarity) is working great and seems to deliver enough charging current for normal charging times.
[Eee Pad Transformer Accessories] Bob Smith42:
It would work. But, I did not see any with 5.5mm OD barrel plug - that is easiest to convert to female USB without soldering anything. Since it has circuitry to increase auto voltage from 12v to 15v it is also slightly expensive. It would be cheaper if someone provided a straight through 12v with current (amp) limiting circuit of 1-1.5 amps. All the 12v straight through I found on ebay were actually 9.8v voltage(measured) and very low amperage (reverse current across diode).

Summary: I have not (yet) found an auto charging solution better than simple AC inverter for original ASUS AC Adapter.