Mobile cellphone charger
While travelling charging of mobile battery is great problem because power supply source is not generally accessible. Here is a simple project using very common electronics components for charging mobile battery using AA cells.
Circuit descriptions of mobile cellphone charger
The main part of the circuit mobile cellphone charger is timer IC NE555, used to charge and monitor the voltage level. IC1 get control voltage to pin 5 by zener diode ZD1. Threshold pin 6 and trigger pin 2 is supplied with a voltage set by VR1 and VR2 respectively. The trigger pin 2 of IC1 is below 1/3VCC when discharge battery is connected to the circuit as a result flip-flop of IC1 is switched on to take output pin 3 high. The process is reversed when battery is fully charged of charged battery is connected. Here transistor T1 used to enhance the charging current from output pin 3 of IC1. Adjust potentiometer VR1 and VR2 as per require.
LED status for different charging conditions
Load across the output | Output frequency (at pin 3) | LED1 |
No battery connected | 765 kHz | On |
Charging battery | 4.5 Hz | Blink |
Fully charged battery | 0 | Off |
PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon)
R1 = 390 Ω
R2 = 680 Ω
R3 = 39 Ω/1W
R4 = 27 KΩ
R5 = 47 KΩ
R6 = 3.3 KΩ
R7 = 100 Ω/1W
VR1, VR2 = 20 KΩ
Capacitors
C1 = 0.001 µF (ceramic disc)
C2 = 0.01 µF (ceramic disc)
C3 = 4.7 µF/25V (Electrolytic )
Semiconductors
IC1 = NE555 timer IC
T1 = SL100 or any Medium power general purpose NPN transistor like: 2N4922 , 2N4921,2N4238, FCX1053A
ZD1 = 5.6 V/1W
LED1
Miscellaneous
SW1 = On/off switch
1.5V*8 AA cells
Mobile connector
hii ur projects are good vr tryin mobile cellphone charger in tat mobile connectors is been specified wat kind of mobile connectors to b used can u clear please 🙂 thank you 🙂
you can use any connector according to your availability!
Does this circuit charge a 3.7 lithium ion phone battery??
plz i need to know asap
Thank you 🙂
Yes it does. Just make sure you limit the charging current by adjusting VR1 and VR2.
Ican not understand what the imprtant of thies project?
Ican charge my mobile with battry 9v without thies circuit .Ihave just tried . please Ineed more information.
@agasthya
it is a universal mobile charger so u can connect any mobile connector..for example..if u want to build a charger for nokia then u have to install a nokia pin or if u want to connect a sony ericsson mobile u can install sony charger pins at the output
can we make a wireless phone charger ,if yes then tell me the processor
to which type of mobile ,this circuit can be used for charging
you can charge any type of mobile battery! And you have to change the value of zener diode according to battery voltage.
plese explain me how values of zenar diodes can be varied according to battery voltages
I mean if your battery volt is less then 3.5V then you have to replace zener diode ZD1 with appropriate value i.e. 4.2Volt
if we will put a rechargeable battery instead of AA cells and if we want to charge that rechargeable battery….what should be done??????
hi i am doing my first project can u help me to judge a title
please explain the working of this circuit
hi..just want to ask..the voltage supply in your circuit is only 12v, how long that will last?
can i get the abstract and introduction about the same above…
am trying to make universal one but for laptop , an u help me
I just want to ask u dat the switch that is mentioned in the circuit diagram so want kind of switches can we use for this circuit and r these easily available if yes then wat do we have to say fr the same….???
can u please xplain the working of this circuit
please tell me total cost of this charger..nd if we connect it with a electricity then what type of change needed?
CAN U EXPLAIN THE WORKING OF THE CIRCUT
The circuit is described already in the article.
Can you please tell me what exactly is it that you don’t understand.
i want a full report on this mobile charger. (pdf)
where can i get it?????
I am not sure about that!
You cannot find a pdf report in our site ; And I also doubt that you can find it anywhere online.
But with some simple online research and this article you can for sure create your own PDF report.
Thanx…
It came @ the right time
If we dont get a SL100 transistor than is there an equivalent trnasistor that can be used…??
You can also use 2N4238.
hey hi….,
cn u explain me…
if the battery is discharge which v connect in this circuit…..
then how cn i charge this battery…
do reply a.s.a.p..:-@
I didn’t understood your question exactly but have you tried resetting VR1 and VR2?
Can we use a battery of 9V instead of 12V without changing any other values? And can we keep C1=0.1uF??? Will it work?????????
Please reply as soon as possible.
Thank you.
You can use 9V instead of 12 volt without any modifications.
And regarding the capacitor’s value I would suggest to use the value suggested in the part list i.e. 0.001 uF ceramic type.
I tried to make this project but led is not blinking when battery is connected.I used 9 V battery.Battery is 3.7 lithium ion battery. I took VR1=VR2=20k and Zener diode of 5.6V.Plz help asap
The factors that determines the working of the circuit are:
> Setting VR1 and VR2 by rotating it to limit output current.
> Many of the cellphone batteries contains three terminals , one for common or ground , one for charging and discharging and one for sensing , So making sure the output is connected to correct terminals.
Where is the connection for
the 7th pin of the ic ????
Its not marked in the fig….
You can leave it open.
sir…
i am getting sufficient voltage but current zero
may i know the significance of 47k nd vr1 ,vr2
input of voltage source replaced by solar panel with 9v it can be work or not
What happen to the circuit if the battery is fully charged? Does it stop charging the battery? If so, how does it happen?
If i use connector at the output for a available handset. It can charge the cell? Without connecting positive,negative terminal to the battery instead i can use connectors. Yes or no.
Please replay….
how to decide what values of resistance and capacitance shoul be choosen…pls rply soon?
Hi
I want to remove the battery and ON button of the mobile and will connect the mobile with the USB power, and the mobile has to be ON when the USB is powered-on and it must be OFF when the USB is powered-off.
Please let me know how to do this.
Thanks
Murugan
what is VR1 nd VR2
if we use 9v bettery does the cellphone battery charges?
hey please can u explain use of vr1 and vr2
how much it could cost for manufacturing???
i implemented the ckt on breadboard….the problem that i am facing is that when the mobile/load is not connected it gives constant output voltage….but when the load is connected the output changes constantly like 5v for one second n den 3v for one second….what it does is that it prevents the mobile from charging continuously…..can you plz tell me wat the problem is n how i can fix it….
vary potentiometer
Hi nice work you have done, i want to use this circuit with Solar cell to charge mobile of Tab-late battery.
Is their any modification required? and how much current is need by the circuit?
3,6,2 will connected?
the circuit is not working pls help me the vr1 andvr2 does not change output which is always 6v
i used 12v supply,iam getting output current as around 60uA ,for P1=P2=20K,plz say the values of P1,P2 for 100mA-200mA output current,i tested in TINA
can you please send me a picture of layout of this circuit on a pcb….
and a final pic of this project that how it looks…
what is the working of zenar diode in this circuit??
Can I use the same circuit to charge cellphone using my bikes battery 12V ???? or is thr will be any issue of higher current rating of the bikes battery…Pls reply asap.
hi sollution circkit graund piar and
Gud a.m, hapi new year sir, about this cellphone charger circuit, i’ve construct it but wat hapen is dat i use 9v battery and when i test it , it display charging and after some secs it cut off and display battery not fully charger and after a secs it conect again and later disconect dats how d circuit does often and often, is it dat the 9v batery does’nt hv the capacity to boost it or wat? or is it compulsery i must use 12v batery?
we have to improve this project like the speed of charge caring have to increase more i thought to efficient it more
Hi Friends ,
I just want to know about that any one is here to know about IEC : 60950 / IS : 13252 .If any than i want to discuss on this . Please contact .
What if I am taking power input from USB, that outputs at 5V. Can I remove the zener diode from the circuit then?
Plzz let me know how should I charge the 12v battery
This charger is wire less or what?explain plz
How should I connect usb connector at the point where cellphobe battry is to be connected
So from what I understand this circuit will charge lithium polymer based batteries and will not overcharge them once they reach their nominal voltage? Also, how would I change VR1 and VR2 if I wanted to output 8.4V at 350-370mA?
Thanks.
is it working properly??????…….and if i want a to charge a iphone…. will it??????…is the potentiometer compulsory…..?????plzz reply
hii instead of using ne555 timer we can use anyanother 555timer and i want working about this circuit plzzzz@@@@@
hey.
it isn’t working..:(
i made it. the LED is glowing but it isn’t providing voltage at output..:(
some one please email me it’s PCB or Connection on Bread Board.
my Email is Qasimbilal19@gmail.com.
I shall be very thank full to him/her.
This is my first project.I think it will turned into success.thank a lot for that information.
What is the total cost for this projet?pls reply soon
less than 150
Can you upload video of this circuit connections on bread board..Its urgent and Its request..
Hi, I’m trying to use this circuit with a school project and I was wondering if you could explain the use of the capacitors in the circuit? Thank you 🙂
What is the output current of this charger?
WHAT CHANGES MUST I MAKE IF I WANT TO — USE 6 V BATTERY INSTEAD OF 12 V BATTERY ?
WHAT CHANGES MUST I MAKE IF I WANT TO — USE 6 V BATTERY INSTEAD OF 12 V..?
my led is not blinking while chrging.What can be a problem?
Does it work 100% sure ?
Instead of 12 v battery my phine is charging at 5 v only with the use of this ckt . it is not give output & at 12 &9 v .the error is over charge ..is occur.. So i can continue with 5v ..so it is correct or not ?
Sir is it safe for mobiles My superior says that it may harm ur mobiles after some days is it good and safe for mobiles