yashsingh1/xdaforums huggingface dataset:
[Eee Pad Transformer Accessories] sareide:
Circuit layout

hi all

I've not well understood how to connect the ASUS CHARGING CABLE to an adapter connected to a charger or power supply (12 V).

I'm going to do by myself the adapter. Could you explain the circuit (passive) layout? I have a usb female to cut and I'm going to buy a barrel. So I'll solder the wires, but I need to be sure about the operations.

First of all I'd like to review the procedure: The asus charger outputs 5V and 15 V according to the connecton of pin 7. But with a different charger the adapter carries the output voltage directly to the trasformer. Do you think that I have understood?

But it remains a question: why do asus carries 5v? what is this voltage for, if the tablet uses 15v to charge batteries? I dont understand this aspect.

thanks in advance.

sareide
[Eee Pad Transformer Accessories] brunes:
It is right in the TF-101 docs if you care to read them. USB 5v power charges the tablet if the screen is off. You can never see it charging because as soon as you turn the screen on, it stops. But if you leave it plugged into your PC overnight, screen off, it *will* charge fully. Of course, disabling wifi first will make it charge faster.
[Eee Pad Transformer Accessories] Bob Smith42:
Thanks. So the TF is just like the Galaxy Tab.

I did read the manual and I am sure I LOL'd that bit because I would never use it, which is why I do not remember it.

In Android all *activities* are terminated when the screen saver goes on. The exceptions would be *services* keep running and clearly hardware components turned on use power. But, all these services and components running also slow charging, guestimating the total charge would be a big frustration for me. ;)

My experience with the GT taught to never attempt to charge the tablet 5v. Especially since there is a big "amp" difference (and charging) between a laptop USB 2.0 5v and others, like wall charger or USB 3.0 5v.

Does anyone have a *requirement* to charge their tablet at 5v?

I ask because of our efforts to DIY mod accessories for the tablet.
[Eee Pad Transformer Accessories] mybikegoes200:
To be fair, that is almost precisely the conditions I charged it (in my car) - I was driving so the screen was off - and I had turned off bluetooth and wifi...

Having said that, I still have the same question (and I measured the output on my little DC-plug-to-2-usb adapter and it is, in fact, feeding 13-14 volts @ 1.1A) - Why are we not saying that those DC-Plug-to-Usb chargers are not an alternative charger?
[Eee Pad Transformer Accessories] Bob Smith42:
I guess it is people's preferences. I put away my Asus wall charger plugs in the desk drawer last week sometime. I use the DX-UA wall plug and cable that end with barrel plug, and a barrel to female usb converter, and my proprietary cable to charge my two TF tablets and docks. After I finish my dock mod next week I will put the proprietary cables away in the desk drawer too.

There are a couple weird cable combinations that work perfect with my dock mod, so far I have not explained them. I will publish more info next week.

Another thing. I got an auto adapter (cig lighter type plug) that pushes 12v to a 5.5mm barrel plug (male). I use a female barrel to <tbd> adapter to power my tablet in the car. However, that 12v auto adapter is dangerous, because if you charge a normal 5v item (e.g. phone, gps, etc) with 12v then bad things probably happen. The auto adapter cable has a warning label hanging on it, but even so, it might not be safe with non-geeks. ;)
[Eee Pad Transformer Accessories] Bob Smith42:
I plug my ASUS CHARGING CABLE into a power/adapter cable with a female USB socket. There is 11~15v on that female USB socket.

I do this in a few different ways. The easiest is to use a DX-UA Universal charger kit with female USB tip. The device allows you to select 11v as your charging voltage, whereas many other chargers limit the female USB to 5v. This difference is why I like the DX-UA Universal, because I want a full voltage charge.

The normal ASUS wall socket charges with 15v to the ASUS CHARGING CABLE. I realized I could remove the DX-UA voltage selector by unplugging it from the wall plug and cable components. Now I have a DX-UA wall plug and cable pushing 15v to a 5.5mm barrel plug (male). I use a short adapter cable to convert to female USB and now I get 15v into my ASUS CHARGING CABLE.

In both these cases, I have soldered, cut, re-wired absolutely *nothing*. It is all plug-and-play. :)

And, as noted on this and other threads there are many other ways to do a similar job. Good luck.
[Eee Pad Transformer Accessories] deadman3000:
Huh? Unplugging it from the wall plug you get 15v? I don't get you.
[Eee Pad Transformer Accessories] Bob Smith42:
Hard to describe with words, here is a picture of the DX-UA showing the wall plug piece and the voltage selector *unplugged*. The wall plug piece is 15v to a 5.5mm barrel plug (male). That wad of wire attached to the wall plug is over 6 feet long.
[Eee Pad Transformer Accessories] retali8:
Can you tell me which one you purchased? I went to Wal-Mart the other day and got a car charger specifically for tablets and plugged the Asus into it but it wouldn't charge it, nor would it just keep it powered up from it as the battery still slowly drained with it plugged in so I'm curious which one you had gotten. Can you take a picture of it or provide us with the brand/model? The one I got said it was 5v with 2.1 amps so idk. :(
[Eee Pad Transformer Accessories] Bob Smith42:
Are you aware?... ANY 5v charger (most of them) will *not* (as in never) charge your TF101 system if your tablet screen is turned on (lighted). If you bought it for the purpose of charging while tablet is in use, you wasted your money. Period.

You need between 11-15v charger to charge tablet IN USE, as DevCake said.

Good luck.
[Eee Pad Transformer Accessories] retali8:
I dont care about charging it... I just want it to stay on power from the plug so it isnt running off fhe battery although he did say the USB charger he purchased did charge it so I was curious as to which one he bought. :D
[Eee Pad Transformer Accessories] Bob Smith42:
Well check this out (or something similar):

12 Volt DC Car Power Plug Adapter Charger Lighter

You can add an adapter cable (female barrel to female usb) and *charge* your tablet in the car.
[Eee Pad Transformer Accessories] deadman3000:
Rated at 10 amps. Ask if it's outputting 10 amps or just taking input at that rating. If it outputs 10 amps you will fry your TF.
[Eee Pad Transformer Accessories] yorkey:
Which is good. More than enough for the TF

You dont really know much about Volts and Amps it seems!

For supplying power to something two things are key

* the right voltage (volts)

* at least the required current (amps)

Provided there are not too many volts (12v is fine) and enough amps it will be fine. 1 amp is probably enough, but if you provide upto 10 amps and it only requires 2.5, it will take 2.5. IF you provide upto 100000000000 amps, it will still only take 2.5.

Note You could provide less current (amps) than it could take, but it will take longer to charge. 12volts is OK, 15v would be better, but that will cost more to get from a 12v power source like a car battery.
[Eee Pad Transformer Accessories] Bob Smith42:
I will work great. Similar to your wall plug, you do not care about too much amps.

It does lack a fuse, so it is a little cheap. If I could find a similar one with a fuse I would switch. In cases with misconfiguration or error it could fry something without a fuse.
[Eee Pad Transformer Accessories] Bob Smith42:
LOL, Right, thanks.
[Eee Pad Transformer Accessories] mybikegoes200:
Upon further review:

I purchased the "Just Wireless" model 04062 from Walmart for $10... It does, in fact, feed the USB standard 5v (just tested) at 1.0A.

I also tested the output of the standard AC charger (which of course converts to DC) and it was, again, 5v @ 1.2A.

I'm certainly not saying the original poster is wrong - he quite clearly knows what he's doing and what he's talking about - I'm just trying to have the cleanest solution for my situation.

So - what I'm thinking I'll do is take a standard cigarette adapter, straight wire a USB extension to it on pins 1&4. I've got a bazillion old cigarette adapters laying around and I'm certain I can find one that feeds the standard car voltage @1.2A or thereabouts.

On a side note, even though cars are "12 volt systems" - they typically "run" at closer to 14 (due to the alternator) and anything less than 13-ish is typically indicative of a failing alternator or other problem with the charging system.

Having said that, I have only one additional thing to say. While I love my new Transformer, the fact that the thing can effectively be made an expensive paperweight by losing the one supplied cable is beyond silly. The fact that ASUS is quite clearly holding the darned things hostage is beyond the pale. I've always loved ASUS products (and have built nearly every computer in the last 10 years using an ASUS mobo) but I have to say this whole charger thing is getting past the point of being a joke to being an insult.

</soapbox>
[Eee Pad Transformer Accessories] setite:
I bought and and it's not working. What am I doing wrong?
[Eee Pad Transformer Accessories] coolfishing:
Are u sure that this car usb can charge your transformer while the screen is on? I bought a similar one (5v, 2amp) from amazon after reading your post earlier, but it can not charge mine. There is no charging icon showed up when the screen was turned on.

I really want to copy your sucess, but failed. Please share more info.
[Eee Pad Transformer Accessories] Bob Smith42:
Can you put a multimeter on the barrel plug and make sure center is positive and report the voltage?

If it is over 11v it should charge the table, if under 11v it might be *working* as a trickle charge that does not show charging in settings. Or, it might be setup wrong polarity (big problems), or fuse blown (if exists).

Good luck! :)
[Eee Pad Transformer Accessories] evening2005:
ASUS response on availability of chargers/cables

I contacted ASUS yesterday about the lack of availability of chargers and cables and they responded, "The chargers/cables for TF101 are expected to be available for sale in the UK by the end of July. However, the exact date is not yet confirmed."
[Eee Pad Transformer Accessories] brachiopod:
I'll tell you one thing, if ASUS does not release a cable in the US and I lose mine, which is likely, I'm buying another product. The Achilles heel of this product is that everything about it depends on not losing that tiny cable, and it is small and removable and too short and you have to remove it and leave it behind to use the tablet. You need the cable for charging, connecting to a computer, and for external USB ports, without it the tablet is useless can can't be charged. You cannot buy a replacement or substitute at any price. It is absolutely ridiculous.
[Eee Pad Transformer Accessories] typci:
Hope this is on topic. Since the title says "and other charging methods", it should be.

Anybody thought about using solar chargers for the transformer? I ride the train for 2-3 days at a time, with no power outlets, but lots of sunshine. I figure fully charge the solar charger's battery before getting on the train, and trickle charge the transformer during the trip.

I can get this USB solar charger for $3-4 a piece.

Battery: 5.5V

Battery capacity: 2600mah

Output voltage: 5V-6V

Output current :300-800ma

Connection: USB Port

Would it be worth the time/effort to link a few of these together to build a charger for the asus transformer?

Or, I can get one of these for a little more money, $50:

Built-in lithium polymer battery Capacity: 12000mAh/14.8V

Output voltage: 4.2V, 8.4V, 12.6V, 16.8V, 19V (optional)

Output current: 4.2V/500 mA; 8.4V/800 mA; 12.6V/1000 mA; 19V/2000mA

This one has all the barrel connectors, and I think a barrel-to-usb adapter. If not I could buy one. Would this be able to provide a full charge to asus transformer?
[Eee Pad Transformer Accessories] bdogg:
Wagan Power Inverter

I am wondering if i just buy a power inverter would be the simplest way..it would work with my tablet, but also for other stuff.

its about $36 at amazon and prime shipping..I don't have confidence in off brand stuff and question the durability of these type of off brand products. I paid 400 for my tablet so i want something that I will feel comfortable with powering it.

It might me a stupid question,i'm not an electrician but having a power inverter would work just as good as having it plug into the wall outlet correct?????

note: I will be using the power outlets..not the usb connection

Wagan 2003-6 400-Watt DC to AC Continuous Power Inverter with Two USB Ports

http://www.amazon.com/Wagan-2003-6-400-Watt-Continuous-Inverter/dp/B002UW7JJ6

Your opinions are appreciated.. thank you :)
[Eee Pad Transformer Accessories] mybikegoes200:
OK...

I hope I'm remembering my circuits classes properly... Amperage, I'm hoping, doesn't matter (if it's marginally above what is required).

I took a cigarette "splitter" (one male, two female) and cut the male tip off. I straight wired a USB extension onto it (pins 1 & 4 negative and positive respectively). I tested the tip - as expected I'm getting ~13v DC, 2.8 - 3.2A (not running - running). Again, though I realize the amperage is higher than needed, it's not as if the cable "forces" 3.2A down the tube - the tablet should only "draw" what it needs. I think.

I then plugged my ASUS cable into the end.

Should I try it? I'm 99% sure it'll work. But I'm 100% certain I'll go mental if I cook the thing.
[Eee Pad Transformer Accessories] Rumbleweed:
Should work fine. Only caution, disconnect prior to starting vehicle. Lots of spikes possible during start
[Eee Pad Transformer Accessories] deadman3000:
Ah! So you can just plug in the wall wart to your TF and off you go? Neat. Me wants! No UK version? Bummer. :(

BTW I have one of those universal power bricks that goes to 15v @ 2.5 amp. Someone said that amps does not matter as long as it's 1 amp or more. Assuming I make sure the polarity is correct can I just use that?
[Eee Pad Transformer Accessories] mybikegoes200:
Found a 1.8A @ 14vDC shorty fuse and put it in the cigarette adapter just in case ;-) Since I have no reason to be in my car at the moment, and I'm lazy - I'll test it out tomorrow :P
[Eee Pad Transformer Accessories] kenatxda:
I found the following power supply at Amazon Germany.

It already provides the USB connector and delivers 12 Volts via configuration (no 5V limitation when inserting the USB connector). Also no possibility to make a plus/minus mistake with the USB connector.

It is called "goobay 1500 Rotary Switch Adaptor NTS 1500 EuP".

I just loaded my Transformer with this power supply and it took about 1 minute per percent for loading. This is quite the same as the original supply.

Only drawback is a small humming of the power supply, when the Transformer is fully charged.

The link to Amazon Germany is:

amazon.de/Goobay-NTS-1500-MW-Schaltnetzteil/dp/B002E4YQHS/ref=sr_1_1?ie=UTF8&qid=1309243316&sr=8-1

Preview of the packaging:

s7.directupload.net/images/110628/temp/5wzhdryy.jpg

Full picture of the packaging:

s7.directupload.net/file/d/2569/5wzhdryy_jpg.htm

Sorry for the inconvenience, but as a "fresh" user, I am not allowed to post links to external sites. So add the http stuff in front yourself.
[Eee Pad Transformer Accessories] yorkey:
As long as the polarity is correct and its a regulated power supply it should be OK!

If its not regulated then it may only drop to 15v when loaded at 2.5 amps. So only taking 1.5 amps from it may end up with more than 15v which would be bad!
[Eee Pad Transformer Accessories] retali8:
Someone should just modify one of the standard 5v usb car chargers to output 15v so it works with the TF101 and so we don't have to buy two different things. :P You could then patent the design and sell them on eBay.. just a thought. :D Although I'm sure the wrong person would buy one and try charging another device with it and end up frying it.
[Eee Pad Transformer Accessories] tonyz3:
Hi

I am wondering if something like this would be a sensible purchase for travel and normal recharging. A little pricey but has a lot of options.

http://www.amazon.com/Minigorilla-N...LW/ref=sr_1_25?ie=UTF8&qid=1309370865&sr=8-25
[Eee Pad Transformer Accessories] Bob Smith42:
Almost worthless, because "5v USB output". If you already had it, then get a cable adapter from barrel to female USB so you can use 12v. Not worth buying without 12v USB and some *easy* way to connect.
[Eee Pad Transformer Accessories] tonyz3:
thanks Bob,

Would the adapters it comes with work i believe it has female usb-- could that work with the asus factory cable.

Also do you have any other suggestions for a portable battery solution. Thx
[Eee Pad Transformer Accessories] Bob Smith42:
Yes the tips will work with female usb at over 11v. They look foolproof on polarity, but if there is a polarity switch I would superglue it. I missed seeing that first time. If that wall plug is between 12-15v you have another charger, but if 5.5v (too low) or 19v (too high) it is no good for directly charging tablet.

I found the 11v selector switch on DX-UA is *not* enough power to *indicate charging* on my TF101 when connected to my tablet 2.5mm barrel mod. This same connection works fine with the ASUS proprietary cable and socket, so 11 volts must be very close to trip point.

A multimeter shows the DX-UA set 11v is actual output 10.8v (not enough for barrel mod) and maybe my barrel mod loses something. But, anything at 12v should be safe with ideal voltage at 15v (regulated so not to go higher).

It comes down to a few questions: how complicated is the configuration (chance of error), number of components and cost, and how easy to get a replacement if failure. I would never get a charger with tips that could be reversed polarity, because I frequently pull the tips off mine when disconnecting and one mistake fries your tablet. Extra components is a hassle.

Since I am doing a mod of my dock this week I will no longer need power from a female usb adapters or the proprietary cable (except for USB sync to PC). My power mod socket is 2.5mm female barrel on the tablet and dock (tablet finished). I have a female 5.5mm barrel to 2.5mm male converter for my DX-UA wall plug. I also use the converter with a 12v auto plug that also ends with a 5.5mm barrel and converts to 2.5mm male.

5.5mm Female to 2.5mm Male Converter

I know of no commercial battery usb output that drives 12v, because I have not looked recently. I already had a couple battery packs from batterygeek.com and these have 5v usb ports (worthless). But, all their base cable systems use 5.5mm barrel so I'm set with the same 2.5mm adapter, or a barrel to female usb. I do not think they have battery packs with 12-15v usb output. One of the best ideas I have heard is to make one yourself from components, and I bet there is someone selling it on ebay.

The main points:

Get something providing 12-15v.

Get something with foolproof polarity.

Get something with female usb adapter so you can plug proprietary cable to charge.

Get some adapter set that is minimal.

Good luck. :)
[Eee Pad Transformer Accessories] mybikegoes200:
Included are:

- A standard cigarette adapter that I cut off of a splitter "Y" adapter. I used this because I knew the adapter would not have a current-limiting circuit inside and would thus feed the full 12-14 volts DC (in my case @ 3.0A but I fused @ 1.8)

- A standard USB 2.0 extension cable, male end cut off

- Connected red-to-red, black-to-black, cut and ignored white and green in the usb cable (signal wires)

- Soldered, shrink-wrapped

- Tested to make sure polarity was correct, amperage & voltage correct and stable

- Plugged in my transformer and charged perfectly - even with screen on. No heat, no other issues.

- Standard disclaimer - not my fault if you do this and cook something.

- Total spent: $0 (I had the adapter laying in my tool chest and the Y adapter in my pile of miscellaneous computer junk)
[Eee Pad Transformer Accessories] Bob Smith42:
I especially love the labels because no-one will just plug their phone into it without asking, and you can tell them stop. Awesome job.

Thanks for posting pics.
[Eee Pad Transformer Accessories] wildpig8:
After reading thru the threads, I went into my store room to dig something that i can DIY. May i know will this work?

Old laptop adapter which is labeled output : 12V 3A

(something like the second pic)

Can i just plug it in into the barrel to Female USB, then to the Asus cable?

i have also went shopping to a second hand laptop adapter shop, there are lots of adapter with 12V output, but various Amp, and they are cheap!

Can all these adapter work? If can, what is the max Amp that i need to get?

In addition, i found this adapter, which is used to charge my RC Heli.(1st pic)

Can i use this?

Thanks!
[myTouch 4G Q&A, Help & Troubleshooting] maf2003:
If im on the line already and i get a another call and if i dont answer it will drop both calls. I had this problem with RoyalGinger 1.6 and went to CM7.0.2 with no problems. im now using RG 2.1 and its doing it too. i search and saw others ask the same question with no answer, hoping someone has a fix for it. Thanks for any help.

p.s. i would post in the Dev section but im still a noob :D
[Acer Iconia A500] wurstici:
I'm new here. I've bought iconia a500 in germany and am not able to switch info english (it isn't in language menu). Acer don't want help me. How I can to do this? Install new rom? It's possible to install only locale files? Thanks for help AZ
[Acer Iconia A500] proxonic:
you need to install More Locale 2 from the market and add custom locale with:

Label: English

Language: en

Country: DE

and i do not remember now but switch it off and on again would be good.

i did it and have all in english.
[Acer Iconia A500] muqali:
It's so odd because the tablet I bought in the US has both UI language and keyboard settings for English, Deutsch, Spanish, French Russian, even CJK
[Thunderbolt Q&A, Help & Troubleshooting] tasenav:
I am running bamf 1.6.3 remix.. I also am using Handcent sms.. I have synced and redownloaded handcent.. No matter how many times I try the sync won't catch.. The contact images remain little androids.

I Heard of a solution and tried to figure through it..

It appears the ROM Manager fix permissions script messed up the permissions on the thumbnails in the contacts folder. The files were mistakenly permissioned as 771 which meant the jpg thumbnail files were unreadable.

This is what I did to fix it:

1. Boot into clockworkmod recovery

2. Go into the mount/umount section

3. mount /system

4. mount /data

5. Connect usb data cable to computer from phone (I use linux so I don't need anything special in the way of drivers)

6. adb shell

7. mount /datadata

8. The above step may take a few seconds to mount

9. cd /datadata/com.android.providers.contacts

10. chmod og+rx *

11. cd files

12. chmod 664 *.jpg

13. cd /

14. umount /datadata

15. umount /data

16. exit

17. Reboot your phone

I ran into a problem at step 6...

I tried to access the adb shell from the command prompt on the computer I rooted my phone through..

When i typed adb shell into my prompt It could not recognize the device or the command.

-- Am I doing something wrong?? Is there Another solution? I love all the help everyone in forums give, it keeps a community running. I am just such a noob, one word lines never do me any good. A little explanation is GREATLY appreciated.

THANKS ALL.