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Buy a battery charger IC.J need schematic to build electronic batery charger for my single 1.2V batery 3500mAh,J don want to charge with solar panels.
Best regards
What's the batteries chemistry? NiMI, NiCAD...
The LM317 Calculator is wrong like most LM317 circuits on the internet. R1 is 240 ohms for the more expensive LM117. It is supposed to be 120 ohms for the LM317.Wire an LM317 providing output voltage of 3V. Attach a series resistor and a 1N4007 diode(.8V drop) for current limit and polarity protection.
500mA transformer can be used without any current limiting resistor for charge time of around 8Hours.
Output voltage and design calculator:LM317 Calculator
Wrong!The LM317 Calculator is wrong like most LM317 circuits on the internet. R1 is 240 ohms for the more expensive LM117. It is supposed to be 120 ohms for the LM317.
A Ni-MH battery is charged with current, not voltage. Set the LM317 with a single resistor as a current regulator at 350mA. Then if the battery was partially charged it will be over-charged if you just time the charge.
A battery charger IC detects when the battery is fully charged then stops the charging to prevent over-charging.
I dont know very much of lectronics and ic,s,please post the right wireing and components how to build this charger for 1.2V batery
regards macobt