Nokia Charger built-it-yourself

[martinzaloudek]

Hi all,
I would like to made my nokia charger.

I would like to ask you for this.

What maximum voltage can be use to charging nokia phones??(original nokia charger has 3.7V)

Must I limit charging current? Or phone is restricting this current automatically..

Thank for all replys.

(Excuse for my English)

[GadgetCatcher]

Hi,

This may sound strange, but why would you want to build your own charger?:confused:
Just buy one.

As for the current.............

I'm not 100% sure but....
the maximum rate you can input 'current' to a phone is determined by the type of mobile you have.
Like a 7650 will allow fast charging, but a 3210 won't.
:rolleyes:
So basically, YES, the phone does restrict the current to some extent, and it will not charge if you try and input too much. (Or you could damadge the phone)
That's why a new nokia charger will not normally charge an older phone, yet an old charger will charge the new phone but normally slower.


Hope that answers your question.

:)

[martinzaloudek]

I interest about USB charger.
I think, if connecting phone directly do USB (+5V) can be dabgerous. I think, if can be destroyes phone or battery by this way.

[DaveGSM82]

I used to charge my 8210 from a 5v power pack, with net monitor active you could see the phone was drawing more current but it worked fine, and obviously charged quicker too. Dont worry about harming your phone with 5v, the original nokia charger (unloaded, I.e no phone connected) puts out about 12v so the phone will not be harmed by the higher voltage.

Hope this helps.

Dave.

[pico]

i read someone was using a 9V battery (600mA i think aint they) pluged straight into the charger bit as a rapid charger in emergency.
he got the charger bit from radio shak (was american tho..), but i think i saw them at www.maplin.co.uk

if you do have a phone such as 3210, may be a good idea to check the solder at battery contacts after a week or so using a 5V+ direct charger, an increase in heat (caused by extra current) may make them prone to crack..
very common on 3210 even with normal chargers :)

battery temp can be checked in netmonitor btw, also with charging mode (normal/fast etc)
br

[GadgetCatcher]

Originally posted by martinzaloudek
I interest about USB charger.
I think, if connecting phone directly do USB (+5V) can be dabgerous. I think, if can be destroyes phone or battery by this way.

You can actually buy USB chargers, so rigging one up should be fairly easy.
If that's what your saying?

:)

[exuptoy]

I ordered 1 today from my local pc shop, only costs £6 and I saw a glimpse of his list and he was only paying £4 for it off the net.

[martinzaloudek]

I have 3410.
Does this phone allow fast charging??

[GadgetCatcher]

Originally posted by martinzaloudek
I have 3410.
Does this phone allow fast charging??

Officially it is not meant to, but it does work to an extent, and will also work with USB charger.

If you use the Nokia Express rapid charger ACP9 you will find that it works, but the phone can get too hot if left unattended. So just keep an eye on it.
(my niece uses my rapid charger on her 3410 and that works ok!)

Hope that helps.
:)

[martinzaloudek]

What is average current during charging? (in mA)

[g3gg0]

Service manual says:

The absolute maximum input voltage is 30V, due to the transient surpressor that is protecting the input.


16.9V Max open voltage for ACP-7
850 mA Max charge current with ACP-9
8.4V typical DC input
12V max DC input

never tried but i guess the CCONT/CHAPS will be statisfied
with any voltage that is (guessed) 1,2V higher than battery
the voltage is... so simply connecting 5V will be okay imho

for better understanding:
30V ABSOLUTE PHYSCAL MAXIMUM
16.9V maximum operation voltage
12V maximum operation voltage while charging
8.4V normal charging voltage


but i dont want to be responsible for any damage cause to you
phone or laptop :D




EDIT: tried it and it works for me (3330)
switching plus and minus wont do harm (like expected)

[martinzaloudek]

I expected some this answer.

Bud I think, if voltage is very high, that somewhere in phone must be voltage drop (so that larger thermal loss too).

Phone not destroy immediately.
Bud i think that it can damage after longer time using charger with higher voltage. Or not?

[g3gg0]

dont think so since its specified for this charging voltage (12V)
when charger not pumps into battery, 16.9V will be okay too

i imho u can even connect it to MAXIMUM 12V (car has about 13.xV)
without killing something

of course some voltage is dropped... but i guess its done with a
step down conversion that doesnt cause thermal stress of
the electronic parts

[Yolly Zubrick]

ACP-8U label says output is 5.3v and current is 500mA. I'm not a technical guys but can we really connect voltages as high as 12v-16v to the phone charging pins?

[g3gg0]

these are the definitions taken from a nokia 3310 datasheet