yashsingh1/xdaforums huggingface dataset:
[Eee Pad Transformer Accessories] mmirgkaz:
it allows a usb device to draw more current then only 1 usb port can provide. 1 usb port can supply 500-900 mA (depending on what version) with that adapter you could pull 1000-1800 mA.
[Eee Pad Transformer Accessories] JLneonhug:
So, for the record this is what I've found and most likely the set up I will be using if my charger did give up on me (UK Based):

USB A Female to 5525 Plug Female - 5.5 x 2.5mm (sourced from 1st page) - £1.79

http://www.ebay.co.uk/itm/USB-Femal...ultDomain_0&hash=item3f077d25f9#ht_2208wt_952

UK DC 5V 2A - with a 5.5 x 2.1mm plug - £2.25

http://www.ebay.co.uk/itm/UK-DC-5V-...werSupplies&hash=item2c6011b795#ht_3643wt_952

OR

UK 12V 2A - with a 5.5 x 2.1mm plug - £3.39

http://www.ebay.co.uk/itm/AC-DC-12V...ctronics_PowerAdaptors_SM&hash=item27c11cf911

1 Meter 40Pin USB DATA Charger Cable for Asus EeePad Transformer TF101 - £8.25

http://www.ebay.co.uk/itm/New-40Pin...Accessories&hash=item4ab2fe2569#ht_3911wt_952

OR

6.6FT USB 3.0 Data Charger Cable For ASUS Eee Pad Transformer TF101 - £11.88

http://www.ebay.co.uk/itm/6-6FT-USB...ccessories&hash=item1e6afa0802#ht_1689wt_1066

Totaling £13-17

(im sure this will go down when the cable becomes more popular.).

With my (rusty) calculations, the 7.4v 3300mAh battery in the TF101 (24-25Wh)

Standard Asus charger 15v @ 1.5A = 18Wh (~1.5 hours)

The above set up - 12v @ 2A = 24Wh (~1 hour)

A Standard USB 2.0 set up - ~5v @ 2A = 10 Wh (2-3 hours)

Laptop/PC USB 2.0 set up - ~5v @ 0.5A = 2.5Wh (10+ hours)

(5v jobbies will have i assume not 100% conversion rate hence increase in time).

Edit: On a sidenote for car charging, surely theres a voltage/current limitation and smoothing circuit available to buy to deal with spikes.. Car rates at 12-16v DC, no transformers required.. not sure why people are talking about inverters etc......
[Eee Pad Transformer Accessories] Emandab1:
I Think So

It should work fine.

My TF101 factory original charger says it pulls 0.6 amps from the wall (note that this is the input, not the output). Assuming I didn't blow my math (I cheated and used http://bit.ly/yeDd2V), 0.6 amps at 110 volts is 66 watts.

I'm sure your phone pulls no more than 10 watts (that's 2 amps at 5 volts). Phone + TF101 will draw no more than 76 watts. The smaller inverter you mentioned says it will only support 75 watts but I doubt they'll be a problem over the 1 watt as I suspect you're phone draws less than 2 amps.

I checked the Bestek adapter and it claims to have a fuse. Assuming the fuse actually does what it's supposed to do, the worst that can happen is you'll blow the fuse. The fuse should prevent your devices from getting too much power and your inverter from heating up and starting to smoke (it's much too young to smoke :-).

That being said, JLneonhug points out that a power inverter is not needed as the car is already running at the right voltage. All that is needed is a fuse to make sure there are no power spikes, the right wires to connect everything together, and some soldering.

The original posting has a pointer to a car charger that costs about $11 and requires no soldering. I don't think you'll get cheaper unless you like to solder stuff and have leftover parts from past projects to build the adapter for no cost.

I think that the charger in the OP is probably better than the inverters provided you have two lighter outlets (the second, with an adapter, for your phone).

So I think I recommend using two car outlets and the TF101 charger in the OP or one of the power inverters you mentioned and wall chargers. My math says the 75 watt inverter will work but my experience says overkill is best in this area.

It is possible to use one car outlet with a power splitter but the car splitters are, IMO, a risky business unless you really know details about them.. Many come without fuses which could lead to the smoking wires. Others shut-off when you draw too much power (see review on Amazon). I had similar problems with my old Droid. I ended up needing a big power inverter and wall adapter to get it to charge in the car.
[Eee Pad Transformer Accessories] JLneonhug:
Welll.. a fuse needed yes, but also a smoothing and limiter for the voltage/current is also required as you do get sudden spikes in the electrical system that a fuse cant catch in time. e.g. im happy to stick a 5v2A phone charger in the cigarette socket, because if the fuse goes on the socket it only blows out that converter (in theory). I wouldn't advise to stick a USB cable onto a fuse, then directly to the car :D

What you need is one of these...

[/joke :D]
[Eee Pad Transformer Accessories] Emandab1:
Well JLneonhug, you have out-jargonned me. I don't understand half of what you said. I'll take that as a sign that you know more about this stuff than I do.

So, at least for this thread, I advise readers who find a contradiction between me and JLneonhug to just assume he's correct. I know I will be.

PS: I think I saw something like that capacitor in a James Bond movie :-D
[Eee Pad Transformer Accessories] JLneonhug:
Lol sorry - Here is layman and short terminology of what i mean: http://www.learningaboutelectronics.com/Articles/What-is-a-voltage-regulator

This is an example of a 12v1A chip:

http://www.reuk.co.uk/LM2940-12V-1A-Low-Dropout-Regulator.htm

Sidenote (sorry its slightly off topic, mods feel free to edit/delete): One would also need a capacitor which (normally) looks like a round cylinder, this helps stores and releases the energy in a smooth/consistant manor (a buffer).

The picture above is a mahoosive version of a capacitor smoothing component, primarily for car-audio systems (Subwoofers which kick out 1000+ Watts which requires lots of sudden surge of energy. Obviously this is OTT for a tablet charger hence; joke :D )

Edit:

So for completeness you want to make/buy/find something very similar to this: http://www.ebay.co.uk/itm/5V-9V-12V...Supplies_ET&hash=item27c3455ff5#ht_591wt_1185

As you can see, the round cylinder/s, and the voltage regulator chip in the middle. Bare in mind this is only 1A, what you ideally want is 1.5A or 2A for faster charge. its a very simple build if you want to try it yourself. Words to look for are: "Regulator, Limiter, Stabilizer, Stabiliser, 12v, DC, 1.5A, 2A, 7812", (7812 seems to be the model number of the 12v regulator chip required).

HTH, any further questions feel free to ask, I'll try and help if i know :)

Edit 2:

I can confirm my calculations earlier that it with 5V .5A it can charge 10% per hour, The charge icon does not pop up but verified using Battery Monitor Widget.
[Eee Pad Transformer Accessories] akajarz:
Since I'm planning to use the TF101 in embedded application for automation portable device, it will be powered from high capacity Li-on battery 14,8V.

The problem is that the initial voltage of this external battery can be up to 16,8V when fully charged.

Does anyone know if TF will survive this voltage Is there any specification re the max voltage it can withstand?

There is alway an option that I would design/buy voltage limiter, but want to avoid this because of power losses.

--

A.
[Eee Pad Transformer Accessories] gazaaa33:
Kinect power supply

Hi all apologies if some of these questions have already been answered.

Same old story here. None of the tricks have worked to get my wall wart working properly...although it still works good as a 5v cell phone charger.

Anyway, i've ordered one of those 5.5mm DC Female Barrel to USB Female cables to use with an old 12v 1.5A I have for an external HDD.

A few questions though as my electrical knowledge is very low. Do I need to worry about overcharging? As the HDD adaptor is designed to be used with an on/off device (ie non charging), would it have an internal cut off when charging is full, or is this controlled by the tablet itself?

Also, on post #308 Logain Ablar mentions using a xbox 360 kinect power supply. I couldn't see any followup to his post. Do these work 'out of the box'? They are rated 12v 1.08A and have a female USB end. htt p:// ebay .com/itm/AC-Adapter-charger-Power-Supply-xbox360-Kinect-UK-/190557645432?pt=UK_Video_Games_Cables_and_Adaptors&hash=item2c5e1eea78
[Eee Pad Transformer Accessories] chris33fr2001:
XP8000

Hy,

Sorry to ask this question again but i have bought a XPAL XP8000 and want to charge my asus transformer with it.

I've read this thread but i still don't know how to make my own cable to work with the XP8000.

I can't order the special cable from XPAL because i have less than one week before taking the plane.

Thanks a lot for your help.
[Eee Pad Transformer Accessories] chris33fr2001:
usb femelle A to Usb Femelle A

And what about an adaptator USB female A to USB Female A ?

My battery pack has a Usb Male cable and i want to use the adaptor female/female to connect it to the original Asus USB Cable

So i'll have both male cable connected through the female adaptor

Do you think it'll work ?

Thanks a lot for yout answer.

There's a 3 week delay to buy a special cable from China and i take a long trip by plane, in less than a week.
[Eee Pad Transformer Accessories] Goatshocker:
edit: nevermind. mod can delete this post.
[Eee Pad Transformer Accessories] ibk74:
Hi all!

first of all - sorry for my english.

second: i broke the usb end for the charger cable for my asus. i bought the usb 3.0 extender cable - cut asus cable, them cut usb 3.0 cable - yes - it's a trouble - different color marking.

on asus side:

green

yellow

white

brown

red

on usb 3.0 extender side (defender):

black

pink

blue

white

and 2 pairs of the pair (brown and white)

anybody knows about - which cable i need connect for just charge this tablet?

please - i dont have any idea about it

with best regards
[Eee Pad Transformer Accessories] heychris:
ATX power

All,

I've been watching this thread for a while. It recently occured to me the best power supply I have is my ATX power from my PC. I'm wondering if anyone has tried to hard wire a charge only port from ATX power.

Thanks

Chris
[Eee Pad Transformer Accessories] Speedier:
I received my new TF101 Wednesday March 14th. Thursday night the charger stopped working. Tried all the fixes on this forum, none worked.

Friday I ordered the Dynex DX-UA from Future Shop for $19.99CAD, I received it today.

I set it to 11v but if my TF101 is on when I plug it in, the tablet begins beeping continuously, as if I am unplugging and re-plugging in the adapter over and over. If I power it down while the power is plugged in, it will charge quickly when powered off. However when I turn it back on it beeps maybe 5 or 10 times, then stops beeping and then there is no indicator that it is charging.

I just ordered the "USB A Female to 5525 Plug Female USB 5V Power Adapter" from Ebay. Will that allow it to charge the same as it did when the Asus power adapter actually worked? Or will I still be missing the battery indicator, and will have to plug in, then shut down and turn back on to stop the beeping?

Edit: Update: Seems it always beeps now no matter what, I can't charge it while it is powered on. I have to plug it in then power it down to charge otherwise it just beeps continuously. Hopefully that 5525 USB fixes it, :x.
[Eee Pad Transformer Accessories] rygor:
Send it under RMA to Asus - mine stops working two weeks ago (charger), I've sent it as RMA, got it fixed and today UPS delivered to me brand new charger & cable (the wall plug is still same) :D

//edit: and the new cable is 2x longer than old one!
[Eee Pad Transformer Accessories] Speedier:
Since that post I actually disassembled the Asus Power Adapter and ended up physically breaking it, I doubt Asus will accept an RMA now as they will know it was tampered with. Anyways shutting it down to charge it isn't a big issue since I can do it every night, then the battery lasts the day. But again hopefully the usb adapter from Hong Kong will fix it as then I'll be able to charge it at 15v instead of 11. I'll probably be waiting until the end of April for it though.
[Eee Pad Transformer Accessories] kumper33:
so my charger and cable both died... so I found a 12v 1amp old charger and cut the end off..... I also cut the usb end off my transformer cable..

I wired red and orange to the + side of the charger... and wired the braided bare line to the - of the charger and it seems to be working. Just have to heat wrap and now I have a 8 foot charging cable... just no usb cable to the computer till I order another one
[Eee Pad Transformer Accessories] rygor:
Heh, I've been 'tempering' mine too before sending to RMA and they still accepted it - they know that the chargers (L01 & L02) are sh$£4! so maybe they don't trouble so much to replace it

Good luck!
[Eee Pad Transformer Accessories] insaneoctane:
Can anyone tell me how fast a 2 amp 5v USB would charge the tf?
[Eee Pad Transformer Accessories] Goatshocker:
Close to not at all. If youre lucky it would go from 0-100%, if its turned off all the time, in a couple of days. Thats right, days.

The TF requires at least 10v to charge somewhat properly. 5v, no matter amp, isnt enough.

edit: actually, didnt I just tell you this in your own thread?...
[Eee Pad Transformer Accessories] howartthou:
First, thank you DevCake for the original post in this thread.

Second, if you are in Australia you should read this for a simple solution.

As many have pointed out, including DevCake, all you need is a 12v AC adaptor with a female USB cable.

You will find most, if not all the ones you have at home are 5v so they will not work. Plus you need one with a female USB.

These are available in electronics stores (I got mine from JayCar), see attached. You might not see them on web sites but actually go into a store and you will see plenty of AC Adaptors. Remember, 12VDC and 1A with female USB.

I bought a PowerTech Plus 3-12VDC 1A Max. It comes complete with a female USB so nothing to do except set it to 12v and then plug in.

I must say when I rang ASUS to find out why I could not find a replacement in stores I was told "this is how we do it, we phone them". Well apparantly so in Australia.

I was also told I could fax an order for a new ASUS adaptor for a mere AUS$55.00 plus $11.00 for a cable (if you need that too) and $22 for delivery. So all up a mere grand total of $88.00. :confused:

They also insisted I give them my name and address or I would not be able to order, because "that's the way we do it".:mad:

So I am glad I found this thread and bought a powertech ac adaptor for $25.00. And nothing more to pay.

All I can say is I am dissappointed in ASUS.:( You should be able to walk into any electronics store and simply buy the original for a reasonable price...
[Eee Pad Transformer Accessories] hoang51:
I'm just wondering, DevCake, or anybody who recognizes what is the make/model of the magnifying lamp in the picture of showing the messy work bench. It looks cool. =]
[Eee Pad Transformer Accessories] buzzboy:
For anyone who needs a charger in the uk, this one is a cracker:

http://www.amazon.co.uk/40Pin-Charg...2?s=electronics&ie=UTF8&qid=1335242675&sr=1-2

And under £11.

Regards.
[Eee Pad Transformer Accessories] fasttechelec:
I don't know much about the technicalities of taking electronics a part, so I opted for these products to charge my tf101

http://http://www.amazon.com/Charger-Cable-Transformer-Slider-SecondShells/dp/B007RDNS66/ref=sr_1_1?s=electronics&ie=UTF8&qid=1335379393&sr=1-1

http://www.amazon.com/Charge-Cable-...5?s=electronics&ie=UTF8&qid=1335379727&sr=1-5
[Eee Pad Transformer Accessories] ngherappa:
Sorry for my English

I have to buy a charger for my transformer, but I did not understand in the first post if I have to buy a universal charger and mod it or if I can buy any charger that is within specifications.

thanks
[Eee Pad Transformer Accessories] bipolarmadman:
There is no such thing as having a power supply that supplies to much current (amperage) as the resistive load will only draw a set amount.

What's this mean? your transformer has a fixed resistive value. The only things needed to create current are, fundamentally, resistance and voltage. So long as you maintain ~12Vdc your transformer will "pull"the current needed to start the charging process so long as the supply can provide that current.

In other words: Even with a 12Vdc charger capable of providing 100000000000000000000 amps you're transformer (or any resistive load requiring 12VDC) will only pull a set amount of current. Algebraically this formula is I=V/R (also V=IxR and R=V/I) where V is voltage I is current and R is resistance.

---------- Post added at 08:08 PM ---------- Previous post was at 08:01 PM ----------

d

I'm not sure about the OP information regarding required specs but essentially yes so long as you get a charger with similar specs to the manufacturer provided charger you will be fine. Do not change the voltage. Current is not so much a big deal if changed. Less current = longer charge times. There will be a point though, with current, where you will be paying for more potential than the tab will utilize.
[Eee Pad Transformer Accessories] BarryO:
Found a pretty good TF101 charger on ebay

Hi,

Looking for a charger for my TF101 since I got it, and finally got one from ebay. It has the TF101 charging cord attached (as it produces 15 Volts, so you don't want to plug a normal USB cable into it).

I can't post links yet, but search ebay for something like:

US AC Wall Charger Power Adapter For Asus Eee Pad Transformer TF101 TF201

It delivers 15 Volts at 1200 ma.

The charger cost about $13. and came from Hong Kong postage free, and fairly quickly (relative to other HK items I've bought).

Note: the TF101 does NOT function while the charger is charging (it goes on, but I cannot manipulate the screen.) But it charges the TF101 well, and in reasonable time. Of course the TF101 works fine when the charger is unplugged from the TF101.

(By the way, this is the same non-or weird-functioning behaviour I get on my Galaxy S2 when charging with a non-oem charger.)

:D
[Eee Pad Transformer Accessories] hagbardceline23:
Charging while using USB HOST

Did you someone get Charging while using USB Host working ?
[Eee Pad Transformer Accessories] Visseroth:
This is a damned good post!!! Been extremely informative even though I have only read about 5 pages worth of posts.

Bottom line is that the gentleman posted that your tablet will only pull so much current is absolutely correct. Every device has a varying amount of current draw. I'm a amateur radio operator and I see it in everything that I with. Granted my knowledge is quite limited and I dabble in radios but none the less I have a mobile radio sitting on my desk that is rated for between 12 and 16v. The current draw varies from 800mA to 8A max during transmit at full power. 800mA is being drawn when it is in the receive state.

Same goes for the tablet. You'll draw up to 2A during charge. Specially if you have a keyboard dock as the tablet and dock both have a battery and may only draw 200mA after the tablet is fully charged just to run the tablet.

With that said being it seems the tablet will charge on anything between 11 and 15v it seems that you should be able to charge your (our) tablet(s) off of a ordinary cigarette lighter as the voltage in a vehicle is usually between 11 (minimum with engine off ACC on) and 14.2 on average (engine on, batteries charged). The only thing I would be concerned about is possible electrical noise. So if someone was to try to plug their tablet into a cigarette lighter I would recommend putting a choke on the electrical cord to the tablet to help eliminate any possible electrical noise which may include ignition noise (gas engines). I would also recommend a 2A or 3A fuse on both the positive and negative wires to avoid any possible surges from either the positive or negative leads.

You should also be able to purchase a 12V power supply for anywhere between 20 and 50 bucks depending on how much current the power supply is rated for. I do recall that radio shack used to have a 12V 10A power supply for $20 bucks. I do not know if that is still the case. If that is the case you should be able to mod just about any cigarette lighter plug and connect a USB cable to the cigarette lighter plug to get your 12v. This would allow those of us that take our tablets on the go to charge our tablets while in a vehicle which is especially handy when on long trips.

Any thoughts or input?

Edit: I tested the output on my Asus AC charger and it seems pin 1 and 4 have a 5v output. I am however wondering if when a couple pins are shorted out it signals the charger to jump to 12 to 15v. If so which pins would that be? Pins 4 and 7?

Still digging......
[Eee Pad Transformer Accessories] yorkey:
Did you read the first post? The information on which pins are shorted is provided just above the diagram of a USB 3 plug.
[Eee Pad Transformer Accessories] b33kewl:
http://www.amazon.com/Asus-Charger-Cable-EeePad-TF101/dp/B007GJR7GS/ref=pd_cp_pc_0

http://www.amazon.com/Dynex-Universal-Camera-Camcorder-Adapter/dp/B003RXH7WG

What about these will these work with my transformer? Are they easy plug and play solutions also?
[Eee Pad Transformer Accessories] ganassa:
The first one is a cable replacement, and that's ok to use with a Car Charger->USB 12V like this http://goo.gl/0We0z (bought, it works fine) or to charge the Transformer via an USB 3.0 port. I think I'll buy it :)

The 2nd has 9V max in output, not enough (see first post: 11~15V)
[Eee Pad Transformer Accessories] ebsebs:
The Dynex Universal adapter will work perfectly to charge your Transformer.

I have two of them, and I use them

without

the voltage adjuster box; the adapter itself outputs around 15V.

If you look at the first post in this thread, you will see that this adapter is one of the original author's recommendations.

I don't know why the packaging says it is designed for "from 3.5V to 9.5V" when the voltage adjuster has an 11V setting.

Regards,

Eric
[Eee Pad Transformer Accessories] xda.glawion.de:
Help: how to built automatic power switch car adapter

Hi @ll,

i read many (about 37) pages of this thread. And no one has the idea to build an safety (car) adapter which supplies 5V to all other devices and 12 to the tf. So would you help me to build one ?

i have 2 ideas:

First on

1. a standard car adapter 5 V to usb (i need the circuit which is inside)

2. a car cigarette plug

3. a female usb3 (plug?)

So could it work if 5V- to pin 4 (on USB Female ???) -> 5V+ on pin 1 and 12V- on Pin7 (which is connected to Pin4 if the original tf cable pluged in) an 12V+ to Pin 1 too ??? Her must ground (5V- and 12 V- isolated)

Second

1. 5V+ to Pin 1 and 5V- To Pin 4

2. a circuit with an transistor - her should come 12V+ to Pin 1 and 12V - to pin 4 if a voltage (5V) between pin 1 and pin 7

Could anyone develop such circuit ???

Whats about this ???
[Eee Pad Transformer Accessories] pyraxiate:
Not sure if anyone saw but we can get the data/sync cables pretty cheap now :

Item: USB Charger Sync Data Cable for ASUS Eee Pad Tablet Transformer TF101 TF201

URL: http://pages.ebay.com/link/?nav=item.view&id=320985765760

Alt URL: http://www.ebay.com/itm/USB-Charger...-Tablet-Transformer-TF101-TF201-/320985765760
[Eee Pad Transformer Accessories] Maarten_0031:
Well, if anybody is interested in which wire completes the circle in the usb spark charge mechanism: it's the yellow one. I came across this thread because my tf 101 only charged when completely shut down, so I ended up figuring out that the charger did not give enough power to the tablet and I wanted to know why. After reading this thread I decided to take apart my usb plug to see if I could see why the cable was not recognized as 3.0. And here you see why: the yellow wire has come loose. Interestingly enough it happened just after flashing CWM and a custom rom (coming from stock) so the first couple of days I ended up trying all sorts of software combo's to see if that wasn't the problem. Anyway, I will try to solder it just for fun to see if I can cat it back to life, but to be sure I ordered a cable from the ebay link in the post above me. Hope it comes fast, because the now goes at a rate of 1% per hour.