hi all, this is my first thread. i'm about to make a ni-mh 6volts 1800 mAh battery charger, can anyone give me some schematics without using any microcontrollers?
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.
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...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
Not entirely true what that circuit is is a constant current source, which is started 'trigged' by the insertion of batteries, and turned off by the temperature of the batteries.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...
I don't see why not for this circuit, just beware that the inputs/outputs of many opamps cannot go within a volt or two of the supply rails.can i replace LM393 with any dual op-amp like lm358? or quad op-amp like lm324?
Use a higher voltage power supplyi 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 ???