Hi guys,this a fast charger for charging rechargeable batteries like Ni-Mh or Ni-Cd,etc.This charger is also useful to charge 9v recharge able batteries upto 2500mah.The charger charges the batteries upto full in just 45 minutes to 1.5 hours.check video
Step 1: MATERIALS:-
1. Transformer 0-9v 500ma(recommended)or 9-0-9 500ma(use the center wire and one 9v side like bridge)
2.Diodes 1N4007 -4pcs
3.Cell holder -max 2pcs
5.Any 3 Amp diode for flywheel protection from batteries -1pc
6.Capacitor 2200uf 16v(prefered) or 25v -1pc
7.wooden or cardboad piece for platform or box of our project.
8.LED any color except yellow and white -1pc
Step 2: Circuit & Concept:-
The design discussed here is very simple but powerful.Its having a 9v 500ma transformer and a bridge rectifier circuitry using diode 1N4007. Capacitor 2200uf 16v are used to filter the output of bridge rectifier and enchance its current and quality ,a green led is there to indicate that the circuit is switched on.After the 2200uf capacitor the current enhances from 500ma to 800ma approx. A 3 amp diode is used as flywheel diode after the capacitor ouput to protect the circuit from damages and voltage strike back.
Step 3: Design & Making
The transformer,the PCB,and the cell holders are all mounted on a wooden ply board piece,the circuit made on a general purpose pcb and cuted in such a way so that its compact.the charger is easy to carry and can even charge 9 volts batteries(rechargeable).check video for more info.
Step 4: Ready Project & Charging Test
The project is now ready to serve you the best ,if you want to charge rechargeable 9 volts batteris then add a battery clip to it according to the polarity.After charging two rechargeable cells(Ni-Mh ,1.2 volts 800mah) for just 45 minutes the both of their voltages were 1.3v which is higher than their rated voltage which is 1.2v,for charging and testing video click here. Congratulations! Your project is ready.
Step 5: Youtube Video
Click Here for YOUTUBE Tutorial .also please like share and subscibe,see my other videos and instructable.