For one of my scopes, a small, commercial goto, I have made an onboard 12V battery pack out of ten 2300 mAH NiMH AA batteries for when I don't feel like lugging a car battery or looking for AC power.
The only thing is, that it isn't quite fun to remove these 10 batteries and recharge them all the time so what would be nice is to leave them in there and charge them whenever the wall wart is connected.
This will obviously have to be current limited at the batteries minimum (trickle) charge. So What I want to do is put a little connection from the DC in jack to the battery pack with an appropriate resistor to limit the current to a trickle. But what value is appropriate for 12 AAs in series? The wall wart is 12V 1A.
Thanks.
TomL
The only thing is, that it isn't quite fun to remove these 10 batteries and recharge them all the time so what would be nice is to leave them in there and charge them whenever the wall wart is connected.
This will obviously have to be current limited at the batteries minimum (trickle) charge. So What I want to do is put a little connection from the DC in jack to the battery pack with an appropriate resistor to limit the current to a trickle. But what value is appropriate for 12 AAs in series? The wall wart is 12V 1A.
Thanks.
TomL
