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Nov 26, 2011. 6:16 AMdoityoureself
says:
heres an idea, do this with a l14v or bigger i-ion battery, I am sure its been done, if anyone finds it let me know where to look. Also a small pocket size li-ion would be cool also.
Apr 21, 2008. 2:29 PMdannydutton (author)
says:
It should work but test it with alligator clips before soldering everything together.
Apr 27, 2008. 11:14 AMsockeye101
says:
also, is this charger good to cherge Lithium Polymer batteries?
NO Unless if you plan for an explosion...this is simply the power source for the device...that has its own integrated charger to change the battery
Apr 28, 2008. 4:59 PMdannydutton (author)
says:
I have no idea. As long as the battery charger accepts 5v and .5-1amps, then you can do it.
Mar 4, 2009. 11:20 AMcarlos-felo
says:
Wow! It's great! It just need for my MP4! Sorry, but my English is bad!
Mar 16, 2009. 5:23 PMdannydutton (author)
says:
The charger should work either way (MP4 player or MP3 player). Just make sure that you check the voltage before building.
Oct 12, 2008. 5:30 AMbobtehbuilder
says:
can i just cut half the wire of the car charger, and then take the end that goes in the ipod and solder that to the end of the charger
Oct 15, 2008. 2:00 PMdannydutton (author)
says:
You can if you use the correct lineup of wires. If you took off the male usb part and soldered the wires, you would have to figure out the correct wires and such. But if you just cut the top metal part off the male plug than that would probely work. Just use the correct voltage and you will be okay.
Jun 26, 2007. 12:13 PMGitarGr8
says:
Was I the only one expecting an electric car that could be charged via USB?
Jun 27, 2007. 10:35 AMdannydutton (author)
says:
I myself wasn't sure if anybody would get confused about my wording. But that could be a possiblility. If you use a hand crank and some transformers, I think it would be possible to put power back into the system. People with wind turbines and solor panels who produce more electricity than what they use get paid by the power company for the extra power that goes back into the system.
Jun 27, 2007. 4:23 AMMyself
says:
Gotta love English. I have the same problem with SATA-to-PATA and PATA-to-SATA converters, and so on. This is a handy project, though such things tend to take a lot of physical abuse and so every precaution should be taken. Personally, I'd start with a USB extension cable and use the molded female connector, doing my splicing back at the DC adapter where the strain relief is easier to reinforce.
Jun 27, 2007. 10:30 AMdannydutton (author)
says:
I was thinking about putting the USB connecter at the adapter but there wasn't enough room in the adapter. Usally on a car adpater there is a support (bumpy-thing) that holds the cable to the plug for your phone. I used shrink tubing to hold everything down to the support thing.
Jun 6, 2008. 11:29 AMferny121
says:
i made something similar but only for my iPod shuffle.i cut the shuffle dock wire leaving the dock.and i cut the car charger wire leaving the car charger.there was one red and one black wire from the car charger.so i solder the black to the black and red to the red on the dock. will this work?
Jun 9, 2008. 12:23 PMdannydutton (author)
says:
Wait let me try and clarify this. You cut off the male usb connector off the ipod? This will work you, as long as there is enough volts and amps, but you won't be able to load songs on it.
Jun 16, 2008. 11:13 AMdannydutton (author)
says:
my charger puts out 4.5v (minimum for charging). anything from 4.5 to 6 is usually okay.
i built this...
http://www.hackaday.com/2005/01/20/how-to-make-a-usb-battery/7#comments
can i use 2 100ohm resistors?
http://www.hackaday.com/2005/01/20/how-to-make-a-usb-battery/7#comments
can i use 2 100ohm resistors?
If the device is supplying 5v at 500mA, then it's drawing 12v at about 208mA.
Jun 27, 2007. 1:23 PMdannydutton (author)
says:
I have a question about ny ownn project since it seems you know about electronics. Is it possible to take out all the components out of the car adapter and install just a 5V regulator just like in the altiods USB chargers?
If your removing the components that supply other than 5v then, yes. You'd need to replace the components. Likely, you can use some of the old components. Try to use the manufacturer's suggested circuit for the project. The capacitors will help to remove the inherent noise on the car's supply. See attachment:
Jun 26, 2007. 11:08 AMcpotoso
says:
Probably not. You are assuming 100% efficiency. Most DC-DC voltage step-down converters are "linear" (e.g. using the venerable 7805) simply convert the excess energy into heat. As far as I know, only switching power supplies get it done with close to 100% efficiency (I really like switching power supplies!)
I did say about... Not exactly. That would be a regulated power supply and would use very little current itself.
Jun 26, 2007. 8:58 PMcpotoso
says:
If it is a linear power supply (like a 7805) then the current in and the current out are essentially the same (the voltage drop is really a voltage drop across a transistor in the 7805 and the electrical energy is converted to heat). I have designed and built many linear supplies and this is how they operate. As I said earlier, switching supplies are a different beast (and very very hard to design and built--I have never even tried...) and they can be close to 100% efficiency. Alas for linear supplies the efficiency is close to being V_out / V_in (in this case 5/12 = 42%).
Your argument is valid. I accept that I am probably wrong. Although, my auto's power supply doesn't produce any discernible heat when I'm using it and when I disassembled it there wasn't much in the form of a heat sink.
Jun 26, 2007. 12:42 PMFIXABLE13
says:
this is cool but do u think it would work for a mp3 player
Jun 27, 2007. 10:23 AMdannydutton (author)
says:
It would work for an mp3 player as long as the mp3 player is charger thru a USB port.
Jun 26, 2007. 9:50 AMrocknrollskwurl
says:
great idea, i might have to try and make one of these
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