# Battery charger general guides

I am making my first battery charger for ni-mh and ni-cd batteries that i use.

I have 9 battery slots :

1x : 9v ni-mh or ni-cd battery

4x : AA 1.2v batteries for ni-mh or ni-cd batteries

4x : AAA 1.2v batteries for ni-mh or ni-cd batteries

as from this link : Reduce voltage to many lower output with resistors and from other circuits and search around the net i understand how it needs to be done to one battery.

But how needs to be done to many as for my needs i need some help.

I havent connect them yet parallel or one by one or serial or whatever it needs. I just have a stable input from a ac to dc transformer that gives me 12volt - 2 amperes

what i want is learn how to do this, if i cant charge them all at once at least to be able to charge as much as i can with a simple way of resistors and diodes. I even have 78L05 that outputs 5v - 100/150 mah stable or mt1117 stable 3.3 volt output and 1 amp or adjustable. Ofcourse the only thing needed is a led to each battery when plugged in to indicate that is connected and charging. (ofcourse if i want the led to go off when fully charged i need some q1 transistor etc etc that i personally dont want to complicate things to much).

I need help to understand which is the best way to charge as many as possible with low mah of about 150 - 300 mah or even splitted by its types and use an appropiate mah for each type.

------------------------------------- UPDATE -------------------------------------

I am updating this post and maby someone could help i have this circuit for my 4xAAA 1.2V batteries and i need to charge them at a stable current of 150 mah - 160 mah I use the 78L05 regulator that provides 100mA stable and 5V output. More infos about 78L05 here : http://213.114.137.49/info/regulator.htm

Can anyone tell me if this circuit is working correct cause i dont have the appropiate test equipment for the moment and the online circuit creations are not so helpfull at my knowledge. Any kind of help or correction would be nice