NiCd Battery charger

Discussion in 'The Projects Forum' started by SahAn, Jan 23, 2016.

  1. SahAn

    Thread Starter New Member

    Jan 23, 2016
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    Hello guys,
    I am a beginner in electronics.
    I have a new 12V,1.5 mah NiCd battery, and 12V 2A adapter.I want to make a battery charger for the same. How to make one?
    I am going to use it on my line follower bot.

    SahAn_img-20160111-wa0005-essential.jpg

    SahAn_img-20160111-wa0007-essential.jpg

    Moderators note: taken the essential parts from the pictures, we do not need the tablecloth.
     
    Last edited by a moderator: Jan 23, 2016
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
    Last edited: Jan 23, 2016
  3. crutschow

    Expert

    Mar 14, 2008
    13,028
    3,237
    Yes, you need more than 12V to charge a 12V NiCd battery.
     
  4. SahAn

    Thread Starter New Member

    Jan 23, 2016
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    Thanks for reply!!!
    Using 12V, will allow me to charge battery upto 12V right? Won't it help With respect to overcharging? Or will it create any problems
     
  5. Lestraveled

    Well-Known Member

    May 19, 2014
    1,957
    1,215
    Possibly
    Measure the power supply voltage with no load on it and again with a load of about 1/2 amp.
     
  6. SahAn

    Thread Starter New Member

    Jan 23, 2016
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    charger schematic.jpg
    what you think about this circuit??
     
  7. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Without any values given, it is impossible to say.

    Bertus

    PS I reduced your pictures to their essentials.
     
  8. SahAn

    Thread Starter New Member

    Jan 23, 2016
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  9. SahAn

    Thread Starter New Member

    Jan 23, 2016
    6
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    R1 - 1.2 kilo ohms 1/4W
    R2 - see R2 and D2 table below
    R3 - 2 kilo ohms 1/4W
    Q1 - TIP41C or any NPN transistor min 1A current and 3W power
    Q2 - 2N2222, CS9013, or similar NPN transistor
    LED1 - Red or any LED with forward voltage around 2V (see LED)
    LED2 - yellow or any LED color except Red
    D1 - 1N4001 or similar diode
    D2 - see R2 and D2 table below
    DC supply - 12V to 15V DC supply or battery

    Read more at http://www.simple-electronics.com/2011/10/simple-ni-cd-charger-automatic.html#seBZzFtOBHcCE1C6.99
     
  10. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    Led 1 is important for the charging current.
    Led 2 will show the end of charge, it will reduce the charge current.
    The voltage table does not show a value for an 12 volts battery zener value.

    Bertus
     
  11. SahAn

    Thread Starter New Member

    Jan 23, 2016
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    The imp thing is to save battery from damage. That zener value is max voltage battery can handle. For 12V, 12.56 to 13V
     
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