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Hi again Mark,
I answered on the other website. (Use a battery charger IC).
yup, cheap, but, some of them are not reliable, i had seen some but, it contains pair of diode and some LED.. but, i have many scraps here, so i came up with my idea that i will build one from scrap.Or just buy a battery charger, they're pretty cheap.
I emailed this guy several times about charging, no microcontrollers, but he knows his stuff: Electronics - USB Powered AA NiMH and NiCd Battery Charger - Stefan Vorkoetter
wow, this one is good, i can directly replace the usb port with my 7805... though, usb port supplies 500mA, 7805 can supply for about 1.5A... so my charging time will be not that long...
can i replace LM393 with any dual op-amp like lm358? or quad op-amp like lm324?
i think this one's good for 2battery in series, about 2.4volts... well, how can i transfor this circuit, because i'm gonna use this one with 6volts charger ???