portable 9V to 5V battery

Step 1 Checklist, parts and tools.

parts:

- 9V battery (duh)
- 9V battery clip (duh again)
- 5V regulator ( L7805 ) sparkfun $0.85
- a piece of proto board
- 2x 1uF ceramic disk capacitor (this isnt really that exact, use about this value if you do not have it)
- an aluminium heat dispenser (not sure if its really needed, i added it just in case)
- some heatshrink if you mess something up like me (if you do it right, unlike me, you wont need it)

optional:
- a green status led (+150ish ohm resistor)
- a switch

tools:

- soldering iron
- dremel
- needle nosed pliers
- third hand (not really needed, but makes it all alot easyer)
- multi-meter (or osciloscope if ur rich...)
- hot glue gun (or just some glue sticks and a candle, if you broke your gun like i did)

there's also a schematic here.

Comments

[nodoubtman]

i think that doesnt work for a ipod touch 4 G?

thank you!
marC:)

[godofal]

i'm not 100% sure, but my guess would be no
apple (among others) like to make it harder for chinese factories to make universal chargers for theyr expensive hardware, so they build in some kind of protection (data exchange over USB) to check that its either a PC, or a branded charger

you could still try it, i've heard stories bout devices with that kind of protection being charged anyway, or halfway

[tdobbins1]

Why do you need the 2 capacitors?

[godofal]

for smoothing out the power
battery juice won't fluctuate much, but it's good practice to add the capacitors anyway

[seben]

would you be able to charge your psp 3001 with this.

[godofal]

there's no switch, you could add one if you wanted though
just take one wire from the battery to the regulator (plus or ground, doesnt matter really) and place a switch in between

and yes, this should be able to charge your PSP
altough im not sure how much it would charge from a single 9V battery

[seben]

weres the switch?

[Robot Lover]

I don't think you need a heat sink for the regulator unless you are you using some higher-current voltage to go into it. So it's optional.

[Adum24]

Will this work with an ipod touch?

[godofal]

i think so, just make sure u get the polarity right on the charging connector (USB?)

[Eric_bard]

No schematics?

[godofal]

i was just thinking to make them, theyl be up in a sec ;)

[godofal]

schematics are up.