Lots of people seem to be looking for lead acid battery chargers for batteries bigger than can be charged fairly fast with the regular 317 chargers, so I thought I would try one for 5 to 20 amp hour batteries. My thought was to try to keep it simple but still try to keep it safe and fast.
Compromise I guess.
Maybe you all could look this one over.
Some notes:
I added the caps to the 317 to get it stable.
The transistor in the voltage feedback loop is for some ambient temperature charge compensation.
I think the initial Vbe variations are taken out by adjustment, but I'm not sure how accurate it will be at the two current levels.
On a side note... Anyone have ideas for a better battery model?
I don't have any plans to build it so any help would be appreciated before I post it as a solution.
Compromise I guess.
Maybe you all could look this one over.
Some notes:
I added the caps to the 317 to get it stable.
The transistor in the voltage feedback loop is for some ambient temperature charge compensation.
I think the initial Vbe variations are taken out by adjustment, but I'm not sure how accurate it will be at the two current levels.
On a side note... Anyone have ideas for a better battery model?
I don't have any plans to build it so any help would be appreciated before I post it as a solution.