yashsingh1/xdaforums huggingface dataset:
[Eee Pad Transformer Accessories] wilx:
Devcake,

thanks for all your help here, I have now made a 12 V power supply, but I also wanted to make an extension lead for the original power supply as the 12V supply I have built is a lot bigger for travelling with. I purchased a USB 3 extension lead off ebay, which had 1 to 1 wiring... except pin 7 , so obviously the lead did not work. Today I went to a computer fair, and purchased another extension cable, which I checked had pin 7 connected. Now when I connect to the tablet sometimes it charges, and sometimes it seems to trip the original power supply, so that even if I remove the extension, and just use the original lead, the power supply will not work for around 20 mins. I have to turn the supply off, and leave for 20 mins. After this it works again. So I thought ok, the other wired pins, or the earth on the shielding of the plug must be causing this tripping, so I have now modded the lead so that only pins 1 , 4 and 7 are wired. This has made no difference, and it either doesn't charge, or trips the supply. Any idea what I am now lacking, or what is causing the tripping. There are quite a lot of people saying they are having the same problem with the tripping .

Any ideas you have about my problem will be gratefully received

Just as a matter of interest too, the power supply I have made to your design is 12 V at 1.2A, Do you think this will charge as fast as the original charger? Am I better off trying to find a 15V ?

Thanks
[Eee Pad Transformer Accessories] DevCake:
Thanks Wilx,

So this extension you are making is for the stock charger correct? And you have a male and female USB 3.0 connector on each end with it wired and straight through? It should charge because almost any off the shelf USB 3.0 extension cable is working for people. I have 2 and the both work fine. The overload of the charger is evident of something not being right. I saw this same condition throughout my testing. I'm not sure what you are doing wrong,I would first test all of your pins for continuity and make sure you have no shorts. But honestly there is no reason to make an extension when an off the shelf one is $6-$8 and you can use the extension with your custom charger as well. Let me know if I'm following your explanation correctly.

I found the stock charger to push about 1.5A which would make the unit charge a little bit faster but not that noticeable. Once I figured out the way to get these generic chargers to work I backed off any further testing hoping to get others involved with charger times with different rated Amp chargers. I wanted to move on and spend time on the USB host function.
[Eee Pad Transformer Accessories] DevCake:
ATTENTION THREAD READERS.

If this thread has helped you put together a DIY charger please help us collect some data. I have moved on to the USB host function but would like to post data about charge times from some of the DIY's out there. This will help us all determine what voltage and amps are optimal.

Please post a link to the charger you purchased with its max Volts and Amps and if you get a chance time a full charge with the table on and off. If you have the dock please do the same.

Thanks!
[Eee Pad Transformer Accessories] wilx:
All the pins were 1 to 1 , with no shorts, but it would put the charger in a cut out mode for 20 minutes sometime. As I said I have now cut the lead in 1/2 and connected only pins 1 4 and 7 and it still does the same .. Any ideas.

Fyi, the charger I built was one from my work place for another device, 12 v rated 1.2 Amps. It seems to work ok
[Eee Pad Transformer Accessories] skchan2:
with the 12v 1.5a adapter i bought, charge time seems to be about 2% every 3 minutes or so...

12v 1.5a adapter

Free USB plug with purchase of the adapter
[Eee Pad Transformer Accessories] diffrnt:
I just picked up the Dynex charger in the first post and it works great. I got it online for about $6 or $8 from newgen. It was open box but guaranteed to work. It looks brand new and came with all of the ends.
[Eee Pad Transformer Accessories] browngeek:
Lifetrons products?

Hi

Don't know if this is the right thread for this (i.e. is this thread about making your own USB cables, etc or about finding other options). Apologies if this is the wrong thread and please feel free to delete my post. If this is the right thread, I'm wondering if any of the Lifetrons products would work?

I note that Lifetrons offers a range of portable charging solutions, but they seem to suggest that they are only cable of charging mobile phones, ipods, etc.

They do have the following portable charging solution:

http://www.3charger.com/diyhp/35067...er(5200mAh_Edition)_(White_Chrome)LT-035.html

I note it comes with an Ipad USB booster:

http://www.3charger.com/diyhp/35067/enus/c-71824/p-AAAV+EABSAAAcQLAAc/USB_Booster_(iPad).html

They also have an all in one charger with USB:

http://www.3charger.com/diyhp/39826...versal_Adaptor_with_2_USB_Charging_Ports.html

Wondering, has anyone tried these out with their Transformer?

I have their previous model:

http://www.3charger.com/diyhp/35067...rger_(4800mAh_Deluxe_Edition_)_(LT-025S).html

But that doesn't work with the transformer.
[Eee Pad Transformer Accessories] Bob Smith42:
I am sure they were going after the higher amperage of USB 3.0 ports.

Before, when I got a Galaxy Tab 7" and started looking for chargers the higher amps was a problem. As you know USB 2 ports are typically .5A and do not trigger my Galaxy Tab to indicate charging. They only do trickle charge, best when the device is turned off - exactly like the TF101. Here we go again with the TF101. ;)

Also, I have tried dozens of supposed 2 & 2.1A car chargers. Very disappointing results. I will start testing them all again with my TF101 and post the results. I am hoping the Galaxy Tab car charger with female USB plug is a close match:

store.androidcentral.com / samsung-car-charger / 5A47A7730.htm

I am not talking about the cable, just the plug. It is definitely different from all the other plugs I tested, and it might be this USB 3 thing.

I will see in the next few days. I just started reading these threads, so maybe someone else has already posted. If so, sorry.
[Eee Pad Transformer Accessories] Meltn:
DevCake charger plan

I received the specified female barrel to usb cord, plugged in a 2a charger and all is good > very good.

Shows charging on ASUS dock keyboard and lightning bolt on screen battery indicator.

Seems to charge at same rate as factory supplied charger.

Very pleased-

Thanks DevCake!

Bruce
[Eee Pad Transformer Accessories] miguelantonio:
Was you able to test the ploarity before you began charging?
[Eee Pad Transformer Accessories] Meltn:
I used a Ebay Sunfone ACW024A-12 which was plug and play with (+ center) and (- barrel).
[Eee Pad Transformer Accessories] DevCake:
Bob,

The issue with the TF is not amps its volts. No standard USB port will charge the TF because it supplies 5Volts at .5 amps. The TF will never be able to charge from a PC USB port because of the volts, it needs a minimum of 11V. In the OP I lay out how to put together a few off the shelf parts to charge the TF. You have to get a switchable DC adapter that supports at least 11V. I've been able to charge the TF with a 800ma adapter at 12V so amps do not seem to dictate if the TF will charge. IT will be slower the lower the Amps but it will charge. Check other users posts for chargers they got working if you want to order something proven.
[Eee Pad Transformer Accessories] jhanford:
I didn't want to think too much about it, so I ran down to RadioShack and got these two as well.

Steps to implement:

- Open boxes

- Plug in adapter, aligning "TIP" on the cord to "+" on the adapter

- Plug in to Transformer

- Take a rest! :)

Yes, it's probably more expensive than other solutions, but it's done and over with now ;)
[Eee Pad Transformer Accessories] bimmer69:
For those of you looking for a step up converter (5V in, 12V out) I have found a DC-DC step up converter. I'd post a link but can't because I'm new to these forums. Search for this item number and you'll see it: EPS-LM2577B12V

It's Cheaper on ebay:

Just search for "12V Step up Buck Inverter Power Module"

I think with an extra USB 3.0 extension cable and some soldering one should be able to get a cable to charge from a regular 5V USB port. Thoughts?

I want to do this so I don't have to carry around the big bulky Asus adapter and can use just my existing USB chargers in the car, work, at friends' places etc.

And a big THANK YOU to DevCake for his research on this subject

Cheers!

The Noobie
[Eee Pad Transformer Accessories] Bob Smith42:
The standard USB port is 5v and .5A which limits total power (P=IV). If you double the volts to over 10v the amps must decrease by half or more. While you can drive 12v the amps will be low and not charge the tablet very quickly. We would need someone to time a complete trickle recharge. But, USB 3.0 can pump out 5v at 1A. I am not sure if USB 3.0 standard has lines at higher voltage, too. Bottom line is stuff charges *much* quicker via USB 3.0.

I think the short cable you can attach to your laptop charger plug with female USB port is the best solution for me.
[Eee Pad Transformer Accessories] rdbeck:
Charger issue

Nice summary of the power needs but who has handled the charger interface for the tablet itself?
[Eee Pad Transformer Accessories] DevCake:
Agreed. Plus the time, effort and cost would not be worth it. Cheaper and quicker to put together what I have laid out in the OP.
[Eee Pad Transformer Accessories] DevCake:
Not sure what you are asking. You did read the OP completely right?
[Eee Pad Transformer Accessories] biiggmike23:
WOW, lots of information. so basically I will never have enough ba__S to do a DIY on anything, I am a newbie! but I would like to have a spare charger and a car charger

So can someone please just add links to items they know work. I do not care about price to much. Ease of usage is more important to me.

Car charger:

Extra charger:

Thanks!
[Eee Pad Transformer Accessories] aramazia kin:
I have a bit of a strange problem. I've got the charger from the uk link in the op and bought a DC to USB adapter, plugged it all in and the tablet went from 20% to 100% in a couple of hours. The problem is that the tablet didn't register it was charging, no electric bolt on the battery icon and it said 'not charging' in the status bit of the settings. The charger was set to 12 volts and it's supposed to push 1.5 amps (no way of checking his though), could the amps be too low to register as charging but still charge it up as fast as the stock charger? I've updated to 3.1 if that helps.
[Eee Pad Transformer Accessories] DevCake:
Hmmm....

You can check the max Amps by finding where the fuse is on the charger. Usually on the generic chargers one screw will open it up to expose the fuse. Not sure what type of fuse will be in the unit, cheaper one usually utilize simple glass fuses. If you find one in there it should be marked for amps @ a specific voltage.

After the tf charges does the battery seem to last as long as when you charge with the factory charger?

Also, have you installed any other battery widgets? I have a couple that have more charging information. Look for one called "whats left" in the market and try your charger again. I have noticed that sometimes on the lock screen even with my factory charger it does not show that it is charging by my desktop widgets do.

Oh and there is a nice battery widget made by an XDA member that shows tablet battery levels. I'll update my signature with that thread.

Let me know what you find.
[Eee Pad Transformer Accessories] DevCake:
I hadn't thought of this till Bob made a comment on my DIY USB host thread about having a native barrel style connector for the TF. I'm going to start looking into modding the dock to have a standard barrel connector. I have a dock now but because of my android integration business I need it in tact to demo and test for my customers so I'm looking for a volunteer to donate one in the name of science =] I would buy another one but just can't swing it at the moment.

Anyone up for it?

Upon dismantling if I see no way of fitting the connector I'll re assemble and return. If I can do it I'll offer the mod as a service.

Of course the volunteer gets theirs for free =]
[Eee Pad Transformer Accessories] aramazia kin:
Can't find a fuse or open it up because it has strange screws (not flat or cross head or torx screws)

Had a look at the battery usage chart and yesterday I browsed the internet for 2 hours and that used about 20% of the battery. That seems about right, doesn't it? Also it took about 2 hours for the adapter to charge the tablet from 15% to 100%.

Tried 'what's left' and that dock and tablet widget but neither registered the tablet as charging.
[Eee Pad Transformer Accessories] dcmtnbkr:
Thanks for pointing out how to set the correct polarity!
[Eee Pad Transformer Accessories] :
Confirming that the RadioShack part number 273-358 with the female USB tip part number 273-227 works.

The + sign and the word TIP should line up.

Good luck all!
[Eee Pad Transformer Accessories] gluggle:
Cat Chewed Through Charging Cable

I have been reading through the posts and it indicates that the Dynex DX-UA Universal charger will serve as a substitution for the Asus charging cable. My cat chewed through the USB cable. I was wondering if the Dynex charger has a tipthat will fit into the Transformer or if the Dynex charger is just to use to lengthen the cord of the manufacturer's charger. Thanks!
[Eee Pad Transformer Accessories] dcmtnbkr:
as does 273-316 with the same 273-227 usb tip
[Eee Pad Transformer Accessories] DevCake:
You still need the factory sync cable to use any of the solutions in this thread. Find someone handy with a solder iron and they can fix your cable. If you send it to me I'll fix it for $20 + return shipping.
[Eee Pad Transformer Accessories] DevCake:
At this point you really need a multimeter to know what is going on with that charger, one with an amp draw feature. To test amps you are going to need a USB 3.0 extension cable you can sacrifice. Now you are getting into some testing you might not be comfortable with. If you can return that charger you might want to and go with the Radio Shack parts that people are having good luck with.
[Eee Pad Transformer Accessories] :
darn, should have seen that one.. could have saved myself a few bucks! :-)
[Eee Pad Transformer Accessories] slickromeo:
What is a "Female DC barrel to USB Female Cable"

in the OP you mentioned a "Female DC barrel to USB Female Cable" and you mentioned that they are available for cheap?

I searched on Ebay for exactly that, but it yielded zero responses.

I'm sorry for being a newbie, but perhaps you could give me a new search term which would yield more results? please and thanks.
[Eee Pad Transformer Accessories] mrg2003:
TF101 power cable in UK

I emailed Asus and they sent this useful reply

Thank you for contacting ASUS customer support. I am sorry to hear that you are facing difficulties with your ASUS Eee Pad Transformer.

The part number for the power adaptor is as follows:

04G26E000101

As we do not retail any components or accessories, please contact your local retailer or see the list of our official retailers by following the link below:

http://uk.asus.com/Static_WebPage/Where_To_Buy/

Kind regards,

Vadim

ASUS Customer Support

UK Support Hotline: 08701208340

http://uk.asus.com

ASUSTek (UK) Ltd.
[Eee Pad Transformer Accessories] DevCake:
Looks like my link under the pic in the OP was bad, updating.

http://cgi.ebay.com/USB-Female-5525...?pt=AU_Laptop_Accessories&hash=item4aa8b7fc55
[Eee Pad Transformer Accessories] Bob Smith42:
The spanner bit #4 is used to take apart the DX-UA Universal charger. ;)

http://www.amazon.com/33-pc-Security-Bit-Set/dp/B0009U6AB4/ref=acc_glance_hi_ai_ps_t2_t_1

33 pc. Security Bit Set (screwdriver bits)

$4 USD
[Eee Pad Transformer Accessories] tom29928:
DIY Transformer charger

I just cut a usb extension (M to F) in half and wired the female to a 12V barrel plug (cigarette lighter size). I found 4 wires in the cable, used the red and black as + and -, and cut off the other two.

1. I stripped the red and black wires on the discarded male half of the cable, and used it to measure stock 120V power block output: 15 VDC, red is +.

2. I then used it to measure the output of my DIY kluge from step 1. When plugged into an old 12VDC power supply, it puts out about 14.5 VDC.

3. I then plugged the Transformer into the kluge, using the factory usb to Transformer cable. It seems to behave about the same as the factory power block.

4. I then plugged the keyboard dock into the kluge (Transformer attached) and it also seems to behave like the factory power block.

The wires in my usb extension cable were very thin. Hard to believe that they are adequate for long term charging. I plan to look for a better extension for my next try, but the prototype is great.

I did a quick test with a goal0 sherpa (I'm doing this project to take the Transformer wilderness camping for 2 weeks, using solar power). The sherpa has a "12 VDC" output. I did not measure the actual voltage, but it was a little less persuasive. It would charge the Transformer up to about 93%, but would not initiate charging is the Transformer was already over 90%. My kluge in a car socket does. I suspect that the sherpa really is 12 volts.
[Eee Pad Transformer Accessories] DevCake:
Why do you need to take it apart? The DX-UA has adjustable voltage.
[Eee Pad Transformer Accessories] DevCake:
Nice, I've been thinking about a portable, solar battery setup as well.

I'm not sure why the Sherpa is not charging to %100 but suspect that there might be a voltage drop or limit on the Amps that is causing it. Did you check the voltage after it reached its max charge on the TF? Do you have a multimeter that measures Amps? I can walk you through testing amps.
[Eee Pad Transformer Accessories] Handshake87:
So are there any actual car chargers or inverters we can get which are not coming from china? I am leaving for a trip in 1 week and do not have enough time to wait for something from China
[Eee Pad Transformer Accessories] yoedba:
Dynex Charger

Anyone here using the Best buy Dynex charger? I am getting static noise from the HDMI\Earphone area while charging with it!
[Eee Pad Transformer Accessories] DevCake:
You can get a DC adapter anywhere, it's the usb female adapter cable that is hard to find in the US.

With a quick search I found this at B & M stores.

Radio shack

http://www.radioshack.com/product/index.jsp?productId=3875414

$39.

And get this tip

http://www.radioshack.com/product/index.jsp?productId=3643549

You'll have to call the stores to see if they have that in stock
[Eee Pad Transformer Accessories] DevCake:
I decided against buying the dynex because of the cost. Noise is usually caused by bad grounds. Do you have access to a multimeter?
[Eee Pad Transformer Accessories] yoedba:
I might have a multimeter around, but how can this be due to bad grounds, if the charger only has two pins, and no grounding pin? Do you think this charger can harm the device?
[Eee Pad Transformer Accessories] Bob Smith42:
I got the Dynex DX-UA Universal kit, and I have a question. It comes in two pieces, a wall plug portion with cable, and the slider voltage box with cable and adapter bits. The wall plug portion has a cable with a male barrel plug end and provides 15v at 1.0 amp.

I connected the wall plug and cable portion directly into your example "5.5mm DC Female Barrel to USB Female cable". Then I plugged in my TF USB cable. Basically this skips the slider voltage box, skips 1/2 the cable, and no adapter bits needed. My TF seems to charge great in this configuration.

Does anyone see any issues with this method?

The advantage seems to be I get a quicker charge at 15v and still get a reasonable cable length extension, instead of the original USB wall plug only.

PS: I get best results searching ebay for "USB A Female to 5525 Plug Female USB 5V Power Adapter".
[Eee Pad Transformer Accessories] yoedba:
I haven't tried this method but I was wondering if you could try and put your ear near the headphone/hdmi area while it is charging and let me know if you hear any static noise. Both your way and using all pieces of the charger.

Thanks
[Eee Pad Transformer Accessories] Bob Smith42:
I hear nothing at all. It is slightly noise polluted here, so if there was a sound it would be very low.
[Eee Pad Transformer Accessories] yoedba:
The sound is very low, I have to put my ear on it directly(actual contact) to hear it, but the fact is that with the Dynex charger I hear it, and with the stock charger I don't. don't know what to do...
[Eee Pad Transformer Accessories] deadman3000:
Slightly confused here. Do I need to do any stripping of cables at all? Can I just get the relevant power supply and barrel to USB connector and go? BTW on polarity. What would be the correct polarity on the adapter link to on Ebay UK on the first page? +?
[Eee Pad Transformer Accessories] Bob Smith42:
Get them, plug and go. Easy, no wiring mess. Center post is +.

Of course, you might test your cables to insure nothing is different than posted in this thread. A few of the adapter types can be reversed by mistake, and you do *not* want to make that mistake.

I found the DX-UA Universal is foolproof because the barrel into voltage selector is center post=+. If you use the DX-UA tips, they are only oriented one way (one pin bigger on each tip forces correct orientation).
[Eee Pad Transformer Accessories] mybikegoes200:
Alright I'm confused...

Regarding the car-charging... why not just plug the cable the transformer came with into pretty much *any* usb-out car adapter?

I bought one very similar to THIS (but from WalMart) and plugged my OEM cable into that and charged the tablet just fine - no heat issues, no battery issues. USB is, after all, supposed to be standard at 5v. We *know* the tablet will charge at 5v (instead of 15, as discussed elsewhere in this thread) because we can charge our beloved tablets via USB on our computers (*always* 5v DC). So the only real difference between feeding it 5v DC from your computer and 5vDC from an adapter like the above is potentially the amperage. As I understand it, it is typically better to go with the same amperage or marginally greater. It is generally not considered a good idea to go with a lower amperage though it shouldn't really hurt anything - just take the better part of forever to charge.

I guess I'm curious why all the adapter to this then to that stuff when we can just use a POCC (Plain old car charger)...
[Eee Pad Transformer Accessories] DevCake:
Show me a post of someone who has a 5V charger working. It does not work. If the tablet does not see at least 11V it will not charge or if it does charge it takes 10X longer.

DC
[Eee Pad Transformer Accessories] Bob Smith42:
I totally agree.

If there is any trickle charge at 5v it does not sufficiently work, and there may not be any charge at all as you said. We would have to shut down the tablet and all functions, and charge for many, many hours. Basically, this type of charging (if it works or not) is useless.

I tested my Galaxy Tablet 7" and it *charges* with a 5v trickle charge, but takes hours to get any useful charge. The lightning bolt indicator (Android charging status) would not indicate correctly (broken bolt) which I suspect is a trickle charge indicator. I have no idea if the TF101 is similar, but I do not care because it is not worth the time. :)