How to get 12V from this NOKIA AC-15E charger ?

[hussien55]

View attachment Nokia small one 5v,800ma.BMP

Hi dears,

This is the circuit schematic simulation of NOKIA AC-15E charger. what i want "please advise me how could i get 12v instead of 5v with the same current".

 

[jiripolivka]

There are lots of DC/DC converters to use. Use a 555 timer at 5 VDC and use a voltage tripler or a coil to get 12 V. The current would be some 50-100 mA max.

 

[BradtheRad]

If you can find out what is the incoming raw supply V, and/or where and how it is regulated, then you might manage to obtain 12 V without adding more circuitry.

Other than that, post #2 gives good suggestions.

 

[mister_rf]

Nokia AC-15E AC-DC adaptor use the Fairchild FAN103 PWM controller.

https://www.fairchildsemi.com/ds/FA/FAN103.pdf

See some inside PCB pictures and the diagram they are using for.


In theory yes that’ s possible to change it for a 12V power supply if first we replace the output capacitor (initially rated at 10V, with a similar 470uF rated at least 16V) and reducing the Rs2 resistor value by connecting a supplementary 9k1 resistor in parallel. (I have never tried this in practice, but give me some time and I’ll do this for you :-D ).

 

[D.A.(Tony)Stewart]

THe schematic initially provided showed a selectable zener array from 2.4 to 30V.. why not simply replace one of these with a 12V zener. or put the 6V in series with the 5.1V to get 11.1V

Just an idea. but the transformer rating may be exceeded with 12V 800mA , so no way., but you could get that from any PC Molex connector for disk drive interface.

 

[mister_rf]

I can see that these days not even a picture is no longer clear evidence to be considered... :roll:

 

[godfreyl]

I can see that these days not even a picture is no longer clear evidence to be considered... :roll:

Your post makes sense, but I wonder where the schematic given in post 1 came from. Perhaps that is from a different charger?

 

[mister_rf]

That’s not important now as long we are discussing about NOKIA AC-15E charger.

 

[hussien55]

HI dears,

I made some tests before posting this one,

First test:
I changed the zener to 12v and the output capacitor into 220uf/100v but it become burned.

Second test:
I changed the transformer by one that working in 12v/1A power supply and it is also become burned.

Hope hear your opinion as soon as possible :roll::roll:.

 

[milind.a.kulkarni]

Did you check the polarity of your capacitor....If it is getting burned I think polarity of your capacitor is reversed....

Good Luck

 

[mister_rf]

Can you post some pictures of the actual charger? That’s the only way we can help with the problems you have there…

 

[hussien55]

https://www.google.com.eg/imgres?hl...w=135&start=0&ndsp=18&ved=1t:429,r:4,s:0,i:76


you could find the picture of what i do

 

[mister_rf]

I have one original NOKIA AC-15E charger. :smile: All the pictures I have already posted are related to this unit.
I was asking about your charger photos, it seems there are major differences between the one I have dismantled and the one you are trying to modify… :roll:

 

[hussien55]

This is the one i have

 

[mister_rf]

Can you take similar photos (PCB components side and solder side), but this time placing the camera at a greater distance? (in order to be focused as accurately).

 

[mister_rf]

And what about PCB components side photo? :smile:

 

[hussien55]

This is the PCB component side

 

[Fragrance]

View attachment 73929

This is the PCB component side

the picture you share are for Nokia non Genuine charger and modification share by mister_rf not applicable for this further you can post all picture in single post

regards
Fragrance

 

[mister_rf]

@hussien55

Sorry, I can't get any info from the last pictures…

 

[khankll]

@mister_rf is having Original charger ...

and @hussien55 is havng "fake" charger . it is not original nokia charger let alone the mentioned one/... first get original charger bro ..