Hi, today I'm going to show you a very simple and safe way to build a battery powered phone charger! Disclaimer: I am not responsible for anything you do resulting from this instructable. First things first! Materials: 1: a 4AA battery holder purchased at radio shack. I recommend one with an on/off switch since they're the same price (You can use a 9v battery with a 9v battery clip it's just personal preference and rechargeable AA are cheaper) 2: a Zener diode purchased in a pack of 2 from radio shack 3: last but not least a female USB cord or a male that you change to a female using this instructable http://m.instructables.com/id/Make-a-USB-Female-connector-out-of-a-USB-Male-conn/ Tools: Wire strippers Soldering iron (optional) Steps: these are short and fairly straightforward. Go ahead and put batteries in (rechargeable works best) 1 bend the Zener diode so the silver ends form a "u" and a right angle with the middle thing 2 attach the red wire of the battery pack to the end of the diode with the black stripe ( and yes it's opposite colors I know) 3 attach the black wire from the battery pack to the opposite side 4 strip all four wires of the female USB chord 5 twist or solder the white and green wires together. 6 attach the red wire to the side of the diode with the black stripe closer to the end then the other red wire 7 attach the black wire to the other side also closer to the end than the other black wire P.s. when I say attach you can either solder or twist Tape female USB to battery pack for easier carry and enjoy your charger!!!!!
<p>do you know how the zener diode limits the voltage from 6 (6.5 if batteries are brand new) to five volts?</p>
I recommend 7805 if u can get one though
It outputs even 5volts. I haven't checked amps but it has worked fine. I was goin to use a 7805 but didn't have a store locally that has one and couldn't order one
<p>why the zener diode? from my understanding they block current in one direction until the voltage exceeds a certain &quot;breaking point&quot; at which it permits current flow both ways. I dont see how that applies here. you should use a 7805 voltage regulator instead, it limits the voltage from 7-35 volts to 5 volts, the required voltage of a usb. please respond.</p>
<p>Do you know what the output is in volts and amps?</p>
Ps sry for the clutter. This is my first instructable
Feel free to comment any questions

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