Hi every one
i have to make a battery charger circuit and i need to know how to calculat maH. As the fast charge rate is 550 maH and the charger i have is 740 maH. so i need to find out what resistor i need
thankd alot
Joker94
Watch your units!
maH is milliAmp times Hours and is a rating of battery capacity, ie 100mA for 5 hours = 500mAh.
The changer can source a current, just Amps, no hours in the unit.
A constant current source like the LM317 wired correctly (see the LM317 data sheet) works well for most battery changing.
But no one asked, What type of Battery are you changing? NiCad, NiMH, LiPol ? It makes a difference.