5V regulators

lorcan32

Hi,
I am trying to build a portable Ipod touch charger , i was told i needed a 5v regulator in order to give the ipod its power, i was planning on hooking that up to a 9v battery and that would provide emrgency power.
I need this for a 15 + hour trip in two days and i have no money to buy one as they are stupidly expensive.
I need to scavenge this regulator, i have a big list of old electronics
.Computers( PC's , Laptops) shuldnt these have one as they need to supply the ports with the voltage??
.TV's
.Monitor
.Old telephone
.Old remote control cars
.a coupe old mobiles
Any hardware geeks PLEASE help, i am desperatley trying to get this to work
PS: If a portable charger can be made without the regulator please tell me how.
Thank You in advance

AMDeeb

Hello!
You don't need a special circuit to make a 5V regulator. Its like single chip, has 3 terminals, 1 for a voltage input higher than 5 Volts(on the left), one common(the middle), one for the output(5 Volt ).

The image below is for a 9 Volt regulator, its the same but the chip number is 7805

GOOD LUCK!

J4D

Higher than 7 volts for a stable output, plus some 330uf capacitors on both the input and output side to stabilize the output. I already told him about the 7805.

lorcan32

The printer did not have the screws that would work with my screwdrivers :/
Now i am asking if there is anything else :)

blabsters

Just buy a fake one! I have one of those for my shuffle they are like the iPhone/ iPad adapters aand it should cost you 15 thou max just go to any shop that sells games/ accessories...

lorcan32

I wish dude i live in the UAE , i can find but as i said i have no cash at all. but i have ba crapload of old electronics and a way to make my own i just need to find the dammed 5v regulator :)

mesa177

J4D wroteHigher than 7 volts for a stable output, plus some 330uf capacitors on both the input and output side to stabilize the output. I already told him about the 7805.

Somewhat similar to what I was going to suggest. L7805 is a cheap chip by the way (0.6$ plus TVA at Katranji, but giving that you live in UAE, try any common electronics shop, I thing EKT does have a branch somewhere there). Make sure that the input voltage is higher than 7V, and use a 0.33 uF and 0.1 uF ceramic capacitors, at the input and the output pins respectively, to stabilize the DC output voltage (check it's datasheet here).

I once read something on Instructables about someone who changed a Nokia charger into an iPod charger. You can check it out too.

lorcan32

Yupp I am using an instructable for this project but i need it to be PORTABLE because i am going to an area in thailand were electrcity is VERY limited. Even more than lebanon :p

yasamoka

Yeah but be careful dude...lithium batteries are pretty sensitive to voltage and may shut down for protection when undervolted / overvolted. iPod batteries are expensive to replace.

blabsters

Ahhhhh I have an Idea if you have any phone shops around ask if they have the any android phone usb adapters androids come with a usb charger and an adapter maybe the dude has a used one he can sell for cheap, or you could get yourself a new android phone but seeing as you are short on cash that wouldn't be a good idea...

lorcan32

@yasamoka Thank you i will definatley be carefull :), i will be testing it our on my old 2nd gen.
@blabsters I litrally have NO CASH :P , not even to buy a case LOL i spent it all on the ipod touch 4gen
I have a LOAD of electronics junk one of them is bound To have a couple of regulators :) , what about a computer wouldnt they have some??

blabsters

hmmm sell your 2 gen lol

lorcan32

That thng is the best for prototyping apps and general messing around :P
and i have two days remeber :)

J4D

We cannot tell you like this. it all depends on the circuit design, the input voltage and the output voltage. and no, a computer power supply will have none since it uses what's called a switch mode power supply which is more efficient but requires a larger circuit and more external components to function.
my advice is to start ripping electronics apart and start searching for them 7805s !

mesa177

Try digital clocks and Hi-Fi audio systems, they're your best shot at having their voltage regulated with L7805s.