YAN9VUSBC

(Yet Another 9 Volt USB Charger)

Step 1 Parts and testing.

PARTS:

5v regulator (Lm7805)
Female USB port
Resistor
LED
Braided wire (20g)
Used 9v battery (Walgreen's brand)
5 minute liquid epoxy
Non-conductive epoxy putty

The circuit design is from http://ipod.hackaday.com/entry/1234000270029372/ All I did was add an LED so I could see if the battery was good. He's got nice diagrams of the USB and regulator to help you wire this together.

Comments

[Pranjal Joshi]

i think it wil damage cell phone coz cell phone need 4 volts and it supliies 9v??
can resistors decrease the voltage?
please rply someone

[cekpi7]

5v regulator (Lm7805) drop voltage to 5v

[Pranjal Joshi]

i made a project same to it..
but aftr charging my cellphone shows "bad contact of charger".. so wat can i do to repair dat??

[cekpi7]

change the usb cabel or check the output voltage

[Pranjal Joshi]

i chkd usb cable..
der is no fault..
n i nt yet got a multimeter to test output voltage.. :(
did u mean for 1st few mins. the voltage is more than 5v bt den it decreases below the minimum charging capacity of battery hence it shows bad charger contact????
if yes then wats the solution on it..

[sanyo8088]

can it charge a psp

[mm3814]

it would work for an iphone right

[Dalton63841]

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.

[Matrix-technician]

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.

[TigrisLi]

Can it charge a Iphone 4??

[neodymium]

This one will not charge the iphone4, but this one will: http://www.instructables.com/id/Make-a-USB-iPhone-iPod-Charger-On-The-Cheep/ basically the same thing but in an altoids tin and outputs 2V across the data pins. this one will also work with any other usb charged device like the one in this instructable here.

[taylorglenn]

it won't charge iPhone 4. The iphone 4 requires 2.2vdc across the D+ pin of the USB connector and 2.8vdc across the D- pin. Otherwise, it will not charge.

[TigrisLi]

Ok, thanks!

[mrcolortvjr]

this is untested but i believe (from a bit of research) that if you use 2 2200 mA resistors it will charge the iPhone

[cekpi7]

ok can i use instead 9v battery , 4*1,2 V rechargeable batterys ? if i use will i need 5v regulator

[BeefyHaze]

I admire the fact that you made something useful regarding usb's...

I just went through 50 pages of instructable usb ideas that all revolved around sticking a usb drive inside of some half-### enclosure.... Thank you for making a real usb instructable that serves a purpose.

[throbscottle]

This is cool and I like it - can you do one for us where you dismantle the battery's insides and use 1 or 2 of the cells, instead of having an external battery? You could use a joule thief type circuit to boost the voltage. Guess you'd need some way to change the cells though. Duh. Just thinking aloud....

[amacias-1]

Good tutorial, i did and it is work ok. thanks

[tave]

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

[courlander]

only in usb mode

[wout smeets]

no you need a special cable

[beehard44]

no you don't

[wout smeets]

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/

[GENERALCHAOS]

pspGO
problem solved

[uhsnamih]

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

[T-virus]

Could you post the circuit here? Your link was broken.

[freakyqwerty]

Is it me or does the title not tell what the instructible is...

[fogman103]

I think it satnds for Yet Another 9v USB Charger.

[freakyqwerty]

I know-it says in the first step I just mean when your searching the site…

[Matrix-technician]

What type of resistor do i need? Also, i would apreciate it if you could list the specs of the resistor so i know which one to get.

[DoctorOfAwesome]

Were do i get a regulator?

[charlie.nourse]

Radioshack

[codongolev]

ebay is a great resource.

[kelseymh]

You buy them.

[codongolev]

I like it. very clean.

I recently made a similar version to charge my psp, except it's got a plug instead of a port. it also is completely housed inside of an altoids smalls tin, and the battery clip and plug fold out for connection. it's pretty convenient if you're about to go somewhere but your psp's dead.

[Taran606]

And how did u bend back the cover and how did you cut the hole to fit the female USB into

[Taran606]

What resistor is that how many ohms

[MACKattacksnipe]

Most Organized USB Charger ive ever seen! nice work

[Ganoderma]

 I made one with an adjustable voltage regulator (using resistors so it's permanently at 5V now). 
In stead of cutting the battery case open, I chose to put the whole thing in polyester resin which is currently hardening. (Paper+scotch tape serve as a mold. Hopefully I'm able to get them off without too much trouble). 
The resin lets light trough so the LED is just in the middle somewhere and I hope it will light the whole thing up if a battery is connected. 

I tested it before going on with the resin to make sure it works. Now hope that I didn't accidently short anything out while putting it in the mold. I guess my multimeter will have to tell me after it hardened. 

I will post some pictures when I'm done. 

[Rahul B]

 Does it matter if you flip the regulator around? Also if I am reading the circuit diagram on the instructable said to have a similar circuit farther down then would you go from battery + to regulator to Battery - and LED and on the Battery - to the resistor then LED Thanks sorry this is a little wordy