NiCd Battery charger

Thread Starter

SahAn

Joined Jan 23, 2016
6
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.
 
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Thread Starter

SahAn

Joined Jan 23, 2016
6
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
 

bertus

Joined Apr 5, 2008
20,564
Hello,

Without any values given, it is impossible to say.

Bertus

PS I reduced your pictures to their essentials.
 

Thread Starter

SahAn

Joined Jan 23, 2016
6
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
 

bertus

Joined Apr 5, 2008
20,564
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
 

Thread Starter

SahAn

Joined Jan 23, 2016
6
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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