Database Info

2A Car Charger for Desire

Hi Guys,
Saw this 2A car charger for HTC Desire, thought I'll post it here and ask everyone if this will work well with HTC Desire. I dont want to damage my new Desire by buying something that kills it.
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=300435508442&_trksid=p2759.l1259
Let me know your comments.
Cheers!!

Amps are not pushed to the phone from the power source,
They are pulled by the phone, from the power source.
Therefore the phone will only request what it needs, IE you cant overload it.
Voltage on the other hand will!
So to answer your question,
it will be ok.
Fon22

Fon22 said:
Amps are not pushed to the phone from the power source,
They are pulled by the phone, from the power source.
Therefore the phone will only request what it needs, IE you cant overload it.
Voltage on the other hand will!
So to answer your question,
it will be ok.
Fon22
Click to expand...
Click to collapse
Thanks Fon22. pardon my lack of knowledge , so what diff will a 700ma or 1000ma will have against 2A car charger ?? Any benefits ? or its better to buy a cheapo 2$ 700ma charger ?

WEll, it's best to get the charger that can deliver the most Amps. So if the phone needs it because you're using GPS and music and what have you - then the amps will be available instead of the phone consumes more battery than it gets from the charger.
So get the one with the biggest Amp spec - but still 12 volts

Thanks guys.
And If I am not wrong , It should work with HTC Desire as well (it is being advertised as being Touch HD)..
Cheers!

Smirge said:
So get the one with the biggest Amp spec - but still 12 volts
Click to expand...
Click to collapse
I know you're referring to the source (input) voltage, but just incase it confuses someone, you want the OUTPUT voltage of the charger to be 5V. Output voltage of 12V would almost certainly do damage as the stock charger and USB spec are at 5V +/- nominal tolerances.
Amps though, yes. Preferable to have something which can deliver at least 1A.

That is correct - the INPUT is 12V as per the car battery, but the OUTPUT should be no more than 5V - thank's for clearing that up

1A is enough.
It's another important thing to this.
I tried to explain the issue here:
http://forum.xda-developers.com/showpost.php?p=6863243&postcount=24
I hope my english is ok.
Edit:
Same info here: http://forum.xda-developers.com/showpost.php?p=6443313&postcount=18

Car dock charger

Does anyone have pictures of the internals of the charger for the official Nexus One car dock?
The reason I ask is because I'm thinking of buying the car dock and hiding the charger out of view. The problem is that where I'm wanting to put it, there is not enough room to install a 12v outlet alone, much less the outlet and the charger, so I'm wanting to hard wire it all, but need to know how much room the internals of the charger are going to take up to see if it will fit where I want to put it.

i ran into a similar problem to you. I ended up not bothering to pull apart the 5v regulator as it appeared to be glued together. unless someone was very determined to get it apart you you not find anybody who has. I ended up buying a cigarette lighter socket and sticking it and the regulator in my fusebox out of the way.
if this isn't an option you can you any standard microusb charger cable as long as it is rated for 1 amp. I'm pretty sure all 1 amp chargers have the signal pin shorted to the power pin to indicate to the device they can pull 1 amp as opposed to 500ma. If you get one that can be taken apart that would work for your project.
Best of luck with your install! I've hardwired 4 different gadgets into my car and love how clean and tidy everything is. just one cable dangling in my car is too much. please post pics if you get it tucked away as you want, i'd love to see how it works out!

Sounds like space is at a premium. Another option is to hard wire in a Belkin USB charger which is heaps smaller. Then just run a USB charge cable from it to the car dock. Check out the harness I made up in the center bottom pic to get an appreciation of how small it is. Downside is the Belkin Micro USB only puts out 1A as compared to 2A from the genuine charger. So the car dock may struggle a bit.

logger said:
Sounds like space is at a premium. Another option is to hard wire in a Belkin USB charger which is heaps smaller. Then just run a USB charge cable from it to the car dock. Check out the harness I made up in the center bottom pic to get an appreciation of how small it is. Downside is the Belkin Micro USB only puts out 1A as compared to 2A from the genuine charger. So the car dock may struggle a bit.
Click to expand...
Click to collapse
I like your setup, I may do something like that myself, but not for the project at hand, but rather just to have a 1amp USB charger for whatever.
Now as for the original project itself, what I'm wanting to do is mount the car dock in my 98 Chevy Blazer right below the review mirror. My Blazer happens to have the Temp. and millage computer readout right above the review mirror mounted to the headliner. There's plenty of places to hook into a switched 12v line in the housing for the millage readout, but as I stated before, it's not enough to house the entire car charger and/or and 12v socket.
I'd prefer to use the original charger that comes with the dock so as to not starve it of power. I'm hoping it's just a small circuit board with wires running to the various connectors. I guess I'll just have to buy it and check it out myself. I don't want anyone to ruin theirs just to satisfy my curiosity, not that I would expect anyone to do that to begin with.

[Q] Car charger - specification

Hello. Our college from forum gave us a link to the car holder. Very cheap price and free postage. I found in his auctions on ebay holder + car charger. But im bit worry about voltage: 5V is ok but 2 A?? Maybe this is dangerous for the our DS? Wall charger give 5V and 1A. What do you think? If you don't mind please check this auction for me. CAR Holder + Charger Thank You very much. Cheers.

djkac said:
Hello. Our college from forum gave us a link to the car holder. Very cheap price and free postage. I found in his auctions on ebay holder + car charger. But im bit worry about voltage: 5V is ok but 2 A?? Maybe this is dangerous for the our DS? Wall charger give 5V and 1A. What do you think? If you don't mind please check this auction for me. CAR Holder + Charger Thank You very much. Cheers.
Click to expand...
Click to collapse
As long as the unit outputs 5V that's all you need worry about. The phone will control how much current is drawn. Even if 2A is available, the phone wont ever draw more than 1A. Current can't be forced upon something. Only voltage can.
Ironically you may have the opposite problem. The main thing you want to watch out for, instead of damage to the phone, is has the manufacturer appreciated HTC smartphones? I've bought several of these car charger things from eBay, and they've ALL made the same mistake. My phone will only charge in USB mode (limited to 500mA) when plugged into them.
Why? Because the two centre 'data' pins are not shorted out in the car charger. If a HTC smartphone does not see a short between the data pins, it'll assume it's plugged into a PC or laptop and limit it's own charging rate to prevent damage to a motherboard. A motherboard that isn't there! Very few manufacturers appreciate this. If your phone sees the two data pins are shorted, it'll charge at the full rate up to 1A.
Unfortunately there is no way of telling until you buy it. The good news is, if your phone will only charge in USB mode, there is a way round it if you don't want to send the charger back for a refund. Get a spare data cable. Strip back the insulation in the middle. Carefully cut back the screen. You'll see 4 cables; Red, Black, Green, White. It's the Green and White cables we are interested in. These are the data cables. Cut these, and on the side that plugs into the phone, short these wires together. Tape the cable back up with insulation tape AND NEVER USE THIS CABLE AGAIN ON A PC OR LAPTOP! It is now only fit for charging from a car charger. But your phone will now see the short between the data pins and not limit its charge.
An official HTC Car charger will not have this problem.

Oooo than you very much. Fantastic answer! I think we should pin this topic for the rest to easy find. Thank you very much again. Cheers!
Sent from my HTC Desire S using Tapatalk

wnp_79 said:
Why? Because the two centre 'data' pins are not shorted out in the car charger. If a HTC smartphone does not see a short between the data pins, it'll assume it's plugged into a PC or laptop and limit it's own charging rate to prevent damage to a motherboard. A motherboard that isn't there! Very few manufacturers appreciate this. If your phone sees the two data pins are shorted, it'll charge at the full rate up to 1A.
Click to expand...
Click to collapse
Thank you for the good explanation.
Does anyone know of unofficial chargers for HTC phones that have the data pins shortened? I would appreciate links to reasonably priced offers.
I have a spare charger from ALCATEL and wonder if I can use that for my HTC Desire S.
PRI: 100-240V~50/60Hz 150mA
SEC: 5.0V 400mA
I know that 400mA is very little but I hope it will suffice until I find a more permanent solution.

i'm using a chager at 5v/1a for over 3 months, it's ok
but 2a maybe too high~

If You only want to charge Your phone it doesnt matter if You have 500mA or 1A.
But if You want to charge and have Google Maps running You need 1A. Because otherwise the phone will discharge too fast.
Smudo

Sony Xperia Z Charging Dock Technical Question

Hi guys.
I have a bit of a tech question in regards to the charging dock for my sony xperia z.
I know how these smartphones can chew a lot of power and can go flat pretty quickly. so i charge the phone from a 240v power supply which has a 5v usb output rated at 2.1 amps. I know it charges faster than using the official charger which is rated at 1.5 amp as i have done my tests at work where i have the equipment to do so on my desk. I understand that it might reduce the life of the battery and probably not recommended as the battery is a lipo (kaboom).
I haven't seen one docking station out there which will charge at 2.1 amps!! So i bought 2 cheap knock-off charging docks off ebay in the hope i could use the charger with the 2.1 amp output. Both docks rated at 1 amp input and output. I was curious as to why they had a 1 amp input. So i opened it up and found a circuit. I redrew that circuit on paper so i could see what was happening. It is a simple circuit with a mosfet and transistor, which no matter what current you put through it, it will only allow up to 1 amp to pass through. Now why would they have that in there? Is it to make it usb compliant? why not just have a straight through connection to allow for higher current charging? Or do the charging pads on the side of the phone only support up to 1.8 amps (like the original sony dock) but they decide 1 amp is safe enough in case they have a faulty unit or whatever...i don't know.
I know it might seem like a stupid question but this raises another. Does the 2 charging pads on the side of the phone link directly in-line with the usb micro port for charging? or does it have its own regulation as well?
Basically what I want to do is modify the dock so it is a straight through connection, bypassing the circuit in the dock so i can plug my 240v mains adaptor to usb which outputs 2.1 amp so I can get that faster charge. My worry is if those charging pads will handle that sort of current or damage its regulator if it has one or even the usb micro regulator if it has its own? I know people say "it will only draw what it needs"......That statement is only true to those devices which have no battery and rely solely on a power adaptor. If the device has a battery, it will take what it is given, unless there is some sort of regulation to prevent over charging. Like I said, I have done my testing.
I was just hoping someone out there might have some more knowledge on this, specially in regards to the charging pads on the side of the phone. I don't particulaly want to ruin my $700 phone

Hi,
have you actually tried to do the modification? I was thinking about the same thing...

Help needed with AC Adapters - Any Electricians here?

Hello everyone,
I was hoping there might be a smart electrician on here that can help me out.
I need to verify if an AC Adapter will work for my device. The device does not have any specs on it.
The only thing I have to go by is what the old adapter says on its label.
Take a look at the two pics - old and new and let me know if the new one will work for my device.
From what I've been reading, I need to match the output of the adapter to the input of the device.
So with the outputs of both adapters being somewhat close, I wasnt sure if it would fry my device or will it work.
The plug does fit into the device. If this new one wont work, I will have to order a new one.
I would greatly appreciate it! Thanks
Old Adapter
Input: AC 100-240V, 120mA 50-60Hz
Output: DC 5.3V, 500mA - ---- +
New Adapter
Input: AC 100-240V, 120mA 50-60Hz
Output: DC 5.0V, 1.0A - ---- +

If it fits you can try it. Never heard of somethinf being fried that fitted. But from looks of it it should charge twice as fast. 500 differnce to old

djhulk2 said:
If it fits you can try it. Never heard of somethinf being fried that fitted. But from looks of it it should charge twice as fast. 500 differnce to old
Click to expand...
Click to collapse
Thanks for the reply. It adapter does fit the device.
I was worried about what you said... the Amps. Because its double what the original was.
There is no charging on this device though. it only powers it to run.
My colleague just got in and said it should work. But he's 90% sure. There is only two of these devices in the world... so I dont want to blow it!
Thanks appreciate it much!

deviouskind said:
Thanks for the reply. It adapter does fit the device.
I was worried about what you said... the Amps. Because its double what the original was.
There is no charging on this device though. it only powers it to run.
My colleague just got in and said it should work. But he's 90% sure. There is only two of these devices in the world... so I dont want to blow it!
Thanks appreciate it much!
Click to expand...
Click to collapse
To keep things safe, I went ahead and ordered a new charger.
I'm still curious to know if it would work or not. Or if it's a 50.50 chance.
Thanks a bunch!

I would be more concerned about the voltage difference than the amperage rating. A lot of electronics would probably be able to tolerate a 0.3V variance without ill effects, but that will not always be the case.
The amperage rating is not a problem, as it's just a measure of the adapter's output current capacity. The actual current it supplies is a matter of the device's demand. If the device only draws 500mA, the adapter will only supply 500mA. The fact that it could supply up to 1A won't be a problem.

As theophile2 stated, there is no need to worry about the higher current rating. The adapter is a constant voltage source and the device being charged draws the current it's been designed for. The polarity looks to the same so as long as it makes contact properly it's good.
For the voltage being 5.3V vs the standard 5V you see mostly now, I don't think there's an issue there to use 5V. I think companies would use 5.3V to account for voltage drop due to the resistance of the cable. There will always be some tolerance built in the design of a minimum 5%-10% voltage swing for normal operation. That being said, if you're not comfortable using it, I'd recommend not to and save yourself the worry especially since you already bought another.
Now that we have USB charging standards of 5V it makes sense to have the wall adapter designed the same and account for this in the circuit design. Smaller IC's nowadays are more frequently being run off 3.3V LDO regulators anyway.
Lastly what sort of device is this?? Is the Nokia charger the original charger?