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I am planning on 10 NIMH AA batteries in series, maybe in the future 2 sets of those in parallel.
How many mAh? Might be better to just buy a $40 charger (cheaper than your batteries, anyway!)
As for a circuit, just attach it directly to your charger. No circuit needed. You can also use a desktop power supply to control the current. Just make sure you don't go above the rated current or overcharge (you need to time it), and lower the current to trickle towards the end.
can a dc regulator be used as a charger to the batteries?without any circuit in between? as it is a constant voltage source