How to build an emergency USB charger

a good reserve of power for your USB devices!!!!

Category:

Howto & Style

Tags:

• costruire
• caricabatterie
• USB
• how
• to
• build
• charger
• linea
• 77
• fantasma

[zimone89]

it limits the tension to about 5 volts......it's an old project.....but it saved me sometimes....now i use another project better than this...

[Jonesfb95]

ciao zimone89.... potresti farlo con un interrutore e con un led che indica che è accesso se ce la fai poi metti il tutorial??? risp please e grzz

[zimone89]

@Jonesfb95 ci provo....anzi, provo a farne una versione "elite" che funzioni con la maggioranza dei dispositivi senza problemi, con un contenitore......insomma.....c­arino.... :D

[smithba76]

You could also use a 7805 voltage regulator, easily sourceable from Radio Shack for $2, to drop the 9v down to a regulated 5v. To charge iPods you will need a couple of 470k resistors, in some case 100k or even 10k will work. Solder the two resistors to pins 2 and 3 on the USB port. Solder the other ends of the resistors (pin 2 to 5v out on usb port) and (pin 3 to ground on usb port).

[zimone89]

@smithba76 yes, i know the 7805....i don't know because i' ve used this system...in fact there is the small 7805 version in TO-92 package. This type isn't able to be mounted on a radiator, but with the small current we are using it's ok....

[karanracha]

it cant operate with sum devices coz 9V battery is not enough for powering 12V usb powered thingys..get it?

[zimone89]

@karanracha i think all USB devices operate at 5 volts....your device probably not operates because it requiores more current (Amperes)

[SuperGM98]

can i ask something..this work on psp slim 2000 n how can i get the 5.1 zener diode & 100ohm resistor??

[mike24001]

0:00 que crapy music...:D

[emmanuelbally]

@zimone89 Which project?

[joshstube]

Do you understand the principal of this design?

the 100 ohm resistor limits current to the device, but what does the diode do here?

[ecigarroaki]

maravilhosa explicação ,

gostei mesmo.

Thanks.

[1707regina]

Who has all that stuff?!??????? 

[nimish951]

man thanks its gr8