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YAN9VUSBC

Step 7Finished:

Test with a multimeter before plugging in your USB powered device.

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13 comments

Jul 10, 2011. 8:52 AMmm3814 says:

it would work for an iphone right

Jul 18, 2011. 11:06 AMDalton63841 says:

It probably could, but I would not recommend it. That 7805 regulator is rated for 1 amp, and is going to get dangerously hot, even with a heatsink, burning off 4v of power to regulate 9v down to 5v. Not to mention that a linear regulator is TERRIBLY inefficient in this particular instance. A better option would be a switching regulator such as this one:
http://focus.ti.com/lit/ds/symlink/ptr08100w.pdf

The switching regulator is still extremely small, and would easily fit if you left the casing only slightly longer. Also, switching regulators don't burn off the excess voltage, but instead use pulse. By turning the flow of current on and off VERY quickly, it simulates lower voltages. A linear reg gives you about 55% efficiency, whereas the switching reg gives you close to 90%, which means that battery will last longer also. Not to mention the added safety because that switching reg is rated up to 10 amps.

Feb 29, 2012. 2:14 AMDamian James says:

USB is only supposed to be able to supply 500mA. I can understand going up to an amp, but 10A?

Feb 29, 2012. 9:34 AMDalton63841 says:

The USB port on a computer only supplies 500nA. The cords can usually handle much more than that. Also, its, up to 10A, but it won't ever be that high. The circuit only pulls what it needs.

Oct 30, 2011. 11:58 AM

Matrix-technician says:

Actually i have made several of these for myself. The regulators I use are Radio shack 7805: +5vdc 1 amp. Even though these are rated up to 150 degrees celcius, mine stay cold to the touch after hours of use. They also incoporate internal overload protection as well as short circuit current limit. So these thing will fry themselves before they can damage your device.

Feb 8, 2008. 9:22 PMtave says:

if u have a psp slim..u can charge from the usb port

May 21, 2008. 11:24 AMcourlander says:

only in usb mode

Aug 22, 2010. 5:06 AMwout smeets says:

no you need a special cable

Oct 10, 2010. 5:36 AMbeehard44 says:

no you don't

Oct 10, 2010. 6:38 AMwout smeets says:

if u wana charge it with te normale cable u need connection with the pc

u need this http://www.game.co.uk/Accessories/PSP/Cables-and-Adapters/GAMEware-PSP-USB-Link-Charger-Cable/~r326193/

May 1, 2011. 12:22 AMGENERALCHAOS says:

pspGO
problem solved

Jun 15, 2011. 6:20 PMuhsnamih says:

i got a portable charger and my psp 3k works just fine, when i hook up my usb cable with it

Mar 23, 2009. 2:38 PMBen The Builder says:

I love the idea to use the 9V battery as the casing, does the 5V regulator heat up really bad like all of the others like this, cause one I tryed to make didn't have the LED or the Resistor and it would actually get so hot it would Unsolder itself Thanks

May 13, 2009. 8:40 PM

TyMan210 says:

Wow, that must have really sucked!

Nov 20, 2008. 3:53 AMchingchong says:

The link for the circuit diagram isnt working, can help?

Jul 25, 2008. 10:05 PMA good name says:

Now we need a rechargable 9volt battery (solar powered :P) so that we never run out. I voted.

Jun 16, 2008. 2:41 AM

hosam_eldin says:

Wonderful project, keep up the great work I think i will need to build it, but i will add a connector for 8 AA rechargeable batteries.

Jun 11, 2007. 11:11 PMnanonano58 says:

thanks dude nice one it also work whit psp & zune :P

Jul 7, 2007. 12:50 AMJames (pseudo-geek) says:

wait....PSP can charge from usb?????

Jul 12, 2007. 6:37 PMhondagofast says:

Yes it can, if you have the right cable. Most car chargers have this cable plugged into an adapter which plugs into the cigarette lighter.

Jul 13, 2007. 12:36 AMJames (pseudo-geek) says:

oh ok cool. does the adapter go into the "USB" port on the PSP or does it adaqpt a ubs to fit the normal charger plug on it?

Aug 14, 2007. 3:21 PMtysonscott2002 says:

if you take a cable that plugs into your charging port on the psp, and strip all 4 wires, you will take the black, green, and white wires, and attach them to pin 4 on the usb, then the red to pin one, the data cables need to be grounded, i made one myself, and it charges off the pc

Jul 13, 2007. 10:05 AMhondagofast says:

It looks like this:

Nov 7, 2011. 3:20 AMjgosselin says:

making one would be easy. ground is pin 1 on the usb 4 is +5v on most cables its red for power black for ground.. and just make sure you wire you psp end plug to be middle positive outside ground.. job done.

Nov 7, 2011. 3:21 AMjgosselin says:

bahh figures i try to remember something get it wrong.. pin 1 is +5volt power.. pin 4 is ground.. sorry for the mix up

Jul 13, 2007. 1:50 PMJames (pseudo-geek) says:

yeah thats what I thought - ont an actual "USV" charger, it just converts USB to the normal chrager plug. but still cool. I should get/build one.

Jul 29, 2007. 8:08 PMJames (pseudo-geek) says:

please excuse my typos :/