Hi all,

I need to build very quickly a bunch of solar chargers for 3xNiMH 2500mAh.
The max charging current would be max 200mA from a solar panel with 5.5V
output.

I've seen a lot of possible choices. However I will love a low cost version
using a battery management IC. Something like MAX639 or DS2715 but less
expensive.

There is also an option of using a venerable LM555 or just a simple
parallel stabilizer with two transistors (and/or TL43x) which cut the
voltage at the solar panel output when the NIMH is fully charged...

I do not want to use a microcontroller for this job since charging NIMH
lower than full capacity is not an issue for my application.

Since the system will work in full sun at perhaps +40C, which will be your
favorite option?

thx,
Vasile
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