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Batery Charging

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3 Threads found on edaboard.com: Batery Charging
A question to on1aag, or anybody who knows How do you size the resistor? I guess it depends on the batery capacity, but what is the formula? Cheers
how haevy duty? 600mAH 1200mAH or higher? What tipe of batery lead acid/NIcad.......?
I built this automatic battery charger circuit But it is not working properly. When the battery voltage reaches any of the threshold value, relay start chattering heavily. I tried to put 0.1uF capacitor between base of transistor and ground but it did no help. Can anyone please sugges