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    You are here:Home/IC 555/ Mobile cellphone charger

    Mobile cellphone chargerWhile 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 chargerThe main part of the circuit mobile cellphone charger is timer IC NE555, used to charge and

    monitor the voltage level. IC1get control voltage to pin 5 by zener diode ZD1. Threshold pin 6

    and trigger pin 2 is supplied with a voltage set by VR1and VR2respectively. The trigger pin 2 of

    IC1is below 1/3VCCwhen discharge battery is connected to the circuit as a result flip-flop of

    IC1is switched on to take output pin 3 high. The process is reversed when battery is fully charged

    of charged battery is connected. Here transistor T1used to enhance the charging current from

    output pin 3 of IC1. Adjust potentiometer VR1and VR2as 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

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    PARTS LISTResistors (all -watt, 5% Carbon)

    R1= 390

    R2= 680

    R3= 39 /1W

    R4= 27 K

    R5= 47 K

    R6= 3.3 K

    R7= 100 /1W

    VR1, VR2= 20 K

    Capacitors

    http://www.electronicsproject.org/wp-content/uploads/2012/08/mobile-battery-charger.jpg
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    C1= 0.001 F (ceramic disc)

    C2= 0.01 F (ceramic disc)

    C3= 4.7 F/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

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    Have You Say!

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    Please leave your Suggestions , Feedback , queries and comments through the comment section

    below. We will do our best to reply to your comment within 12-24 hours.

    P.S. Emails regarding project helps will be strictly ignored ; so please use this Comment form

    instead.

    Comments

    1. agasthya says:

    January 15, 2013 at 8:49 am

    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

    Reply

    o admin says:

    January 21, 2013 at 11:20 am

    you can use any connector according to your availability!

    Reply

    Diode F says:

    March 5, 2013 at 3:12 pm

    Does this circuit charge a 3.7 lithium ion phone battery??plz i need to know asap

    Thank you

    http://electronicsproject.org/mobile-cellphone-charger/#comment-488http://electronicsproject.org/mobile-cellphone-charger/#comment-488http://electronicsproject.org/mobile-cellphone-charger/?replytocom=488#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=488#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-627http://electronicsproject.org/mobile-cellphone-charger/#comment-627http://electronicsproject.org/mobile-cellphone-charger/?replytocom=627#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=627#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-2140http://electronicsproject.org/mobile-cellphone-charger/#comment-2140http://electronicsproject.org/mobile-cellphone-charger/#comment-2140http://electronicsproject.org/mobile-cellphone-charger/?replytocom=627#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-627http://electronicsproject.org/mobile-cellphone-charger/?replytocom=488#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-488
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    Reply

    Electroinics Project Adminsays:

    March 5, 2013 at 9:30 pm

    Yes it does. Just make sure you limit the charging current by adjusting VR1 and VR2.

    Reply

    2. thiyagu says:

    January 18, 2013 at 10:07 am

    @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 caninstall sony charger pins at the output

    Reply

    3. ajay durgude says:

    January 19, 2013 at 6:46 am

    can we make a wireless phone charger ,if yes then tell me the processor

    Reply

    http://electronicsproject.org/mobile-cellphone-charger/?replytocom=2140#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=2140#respondhttp://electronicsproject.org/http://electronicsproject.org/http://electronicsproject.org/mobile-cellphone-charger/#comment-2176http://electronicsproject.org/mobile-cellphone-charger/#comment-2176http://electronicsproject.org/mobile-cellphone-charger/?replytocom=2176#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=2176#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-550http://electronicsproject.org/mobile-cellphone-charger/#comment-550http://electronicsproject.org/mobile-cellphone-charger/?replytocom=550#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=550#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-572http://electronicsproject.org/mobile-cellphone-charger/#comment-572http://electronicsproject.org/mobile-cellphone-charger/?replytocom=572#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=572#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=572#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-572http://electronicsproject.org/mobile-cellphone-charger/?replytocom=550#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-550http://electronicsproject.org/mobile-cellphone-charger/?replytocom=2176#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-2176http://electronicsproject.org/http://electronicsproject.org/mobile-cellphone-charger/?replytocom=2140#respond
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    4. madhuri says:

    January 21, 2013 at 11:08 am

    to which type of mobile ,this circuit can be used for charging

    Reply

    o admin says:

    January 21, 2013 at 11:18 am

    you can charge any type of mobile battery! And you have to change the value of zener diode according to

    battery voltage.

    Reply

    5. madhuri says:

    January 21, 2013 at 11:24 amplese explain me how values of zenar diodes can be varied according to battery voltages

    Reply

    o admin says:

    http://electronicsproject.org/mobile-cellphone-charger/#comment-624http://electronicsproject.org/mobile-cellphone-charger/#comment-624http://electronicsproject.org/mobile-cellphone-charger/?replytocom=624#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=624#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-626http://electronicsproject.org/mobile-cellphone-charger/#comment-626http://electronicsproject.org/mobile-cellphone-charger/?replytocom=626#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=626#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-628http://electronicsproject.org/mobile-cellphone-charger/#comment-628http://electronicsproject.org/mobile-cellphone-charger/?replytocom=628#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=628#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=628#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-628http://electronicsproject.org/mobile-cellphone-charger/?replytocom=626#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-626http://electronicsproject.org/mobile-cellphone-charger/?replytocom=624#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-624
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    January 21, 2013 at 11:30 am

    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

    Reply

    6. usha says:

    January 22, 2013 at 4:41 pm

    hi i am doing my first project can u help me to judge a title

    Reply

    7. madhuri says:

    January 23, 2013 at 10:37 am

    please explain the working of this circuit

    Reply

    8. resy says:

    February 7, 2013 at 11:39 am

    hi..just want to ask..the voltage supply in your circuit is only 12v, how long that will last?

    http://electronicsproject.org/mobile-cellphone-charger/#comment-629http://electronicsproject.org/mobile-cellphone-charger/#comment-629http://electronicsproject.org/mobile-cellphone-charger/?replytocom=629#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=629#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-660http://electronicsproject.org/mobile-cellphone-charger/#comment-660http://electronicsproject.org/mobile-cellphone-charger/?replytocom=660#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=660#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-688http://electronicsproject.org/mobile-cellphone-charger/#comment-688http://electronicsproject.org/mobile-cellphone-charger/?replytocom=688#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=688#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-964http://electronicsproject.org/mobile-cellphone-charger/#comment-964http://electronicsproject.org/mobile-cellphone-charger/#comment-964http://electronicsproject.org/mobile-cellphone-charger/?replytocom=688#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-688http://electronicsproject.org/mobile-cellphone-charger/?replytocom=660#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-660http://electronicsproject.org/mobile-cellphone-charger/?replytocom=629#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-629
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    Reply

    9. Aakash says:

    February 10, 2013 at 2:58 pm

    can i get the abstract and introduction about the same above

    Reply

    10. dastan triphon says:

    February 18, 2013 at 2:31 pm

    am trying to make universal one but for laptop , an u help me

    Reply

    11. Anjna says:

    February 18, 2013 at 7:41 pm

    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.???

    Reply

    http://electronicsproject.org/mobile-cellphone-charger/?replytocom=964#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=964#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1011http://electronicsproject.org/mobile-cellphone-charger/#comment-1011http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1011#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1011#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1274http://electronicsproject.org/mobile-cellphone-charger/#comment-1274http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1274#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1274#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1286http://electronicsproject.org/mobile-cellphone-charger/#comment-1286http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1286#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1286#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1286#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1286http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1274#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1274http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1011#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1011http://electronicsproject.org/mobile-cellphone-charger/?replytocom=964#respond
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    12. nandhini says:

    February 19, 2013 at 10:36 pm

    can u please xplain the working of this circuit

    Reply

    13. Anonymous says:

    February 21, 2013 at 3:01 pm

    please tell me total cost of this charger..nd if we connect it with a electricity then what type of change

    needed?

    Reply

    14. BARATH KUMAR.Asays:

    February 24, 2013 at 12:10 pmCAN U EXPLAIN THE WORKING OF THE CIRCUT

    Reply

    o Adminsays:

    http://electronicsproject.org/mobile-cellphone-charger/#comment-1328http://electronicsproject.org/mobile-cellphone-charger/#comment-1328http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1328#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1328#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1411http://electronicsproject.org/mobile-cellphone-charger/#comment-1411http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1411#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1411#respondhttp://yahoo/http://yahoo/http://yahoo/http://electronicsproject.org/mobile-cellphone-charger/#comment-1503http://electronicsproject.org/mobile-cellphone-charger/#comment-1503http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1503#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1503#respondhttp://electronicsproject.org/http://electronicsproject.org/http://electronicsproject.org/http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1503#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1503http://yahoo/http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1411#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1411http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1328#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1328
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    February 24, 2013 at 12:15 pm

    The circuit is described already in the article.

    Can you please tell me what exactly is it that you dont understand.

    Reply

    15. chaitanya says:

    February 24, 2013 at 8:15 pm

    i want a full report on this mobile charger. (pdf)where can i get it?????

    Reply

    o Adminsays:

    February 24, 2013 at 9:49 pm

    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.

    Reply

    16. Any Hussain says:

    March 2, 2013 at 9:11 am

    http://electronicsproject.org/mobile-cellphone-charger/#comment-1504http://electronicsproject.org/mobile-cellphone-charger/#comment-1504http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1504#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1504#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1519http://electronicsproject.org/mobile-cellphone-charger/#comment-1519http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1519#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1519#respondhttp://electronicsproject.org/http://electronicsproject.org/http://electronicsproject.org/mobile-cellphone-charger/#comment-1525http://electronicsproject.org/mobile-cellphone-charger/#comment-1525http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1525#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1525#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1859http://electronicsproject.org/mobile-cellphone-charger/#comment-1859http://electronicsproject.org/mobile-cellphone-charger/#comment-1859http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1525#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1525http://electronicsproject.org/http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1519#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1519http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1504#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1504
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    ThanxIt came @ the right time

    Reply

    17. Any Hussain says:

    March 2, 2013 at 9:13 am

    If we dont get a SL100 transistor than is there an equivalent trnasistor that can be used??

    Reply

    o Electroinics Project Adminsays:

    March 3, 2013 at 5:58 pm

    You can also use 2N4238.

    Reply

    18. aditya kumar says:

    March 12, 2013 at 10:26 pm

    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..:-@

    http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1859#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1859#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1861http://electronicsproject.org/mobile-cellphone-charger/#comment-1861http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1861#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1861#respondhttp://electronicsproject.org/http://electronicsproject.org/http://electronicsproject.org/mobile-cellphone-charger/#comment-1970http://electronicsproject.org/mobile-cellphone-charger/#comment-1970http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1970#respondhttp://electronicsproject.org/mobile-cellphone-charger/?replytocom=1970#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-2670http://electronicsproject.org/mobile-cellphone-charger/#comment-2670http://electronicsproject.org/mobile-cellphone-charger/#comment-2670http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1970#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1970http://electronicsproject.org/http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1861#respondhttp://electronicsproject.org/mobile-cellphone-charger/#comment-1861http://electronicsproject.org/mobile-cellphone-charger/?replytocom=1859#respond
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    Reply

    o Electroinics Project Adminsays:

    March 13, 2013 at 11:44 am

    I didnt understood your question exactly but have you tried resetting VR1 and VR2?

    Reply

    19. Anisha Rajput says:

    March 17, 2013 at 2:57 pm

    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.

    Reply

    o Electroinics Project Adminsays:

    March 24, 2013 at 9:34 am

    You can use 9V instead of 12 volt without any modifications.

    And regarding the capacitors value I would suggest to use the value suggested in the part list i.e. 0.001 uF

    ceramic type.

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    20. Achu says:

    March 17, 2013 at 8:35 pm

    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

    Reply

    o Electroinics Project Adminsays:

    March 24, 2013 at 9:30 am

    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 anddischarging and one for sensing , So making sure the output is connected to correct terminals.

    Reply

    21. bhumika says:

    March 20, 2013 at 2:56 pm

    Where is the connection for

    the 7th pin of the ic ????

    Its not marked in the fig.

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    o Electroinics Project Adminsays:

    March 24, 2013 at 8:47 am

    You can leave it open.

    Reply

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