Hi
i made 6 and 8 cells (NiMh 1.2v each) charger, i used power drill battery charger and added voltage regulators into it - 9V 1.5A regulator for 6 cells pack, and 12V 0.1A regulator for 8 cells pack.
Everything works fine:
in beginning of charging regulators works like constant current, at the end they behave like constant voltage source. Current drops very low - something like trickle charging - no battery overheating, or overcharge.
Problem is that the only indication that charging is finished - voltage regulators cools down - means low current is flowing throw them.
Is there any other way to detect end of charging in my case?
Some sort of current threshold (circuit cutoff at low current)?
Or led indication if very low current is flowing? (<10mA or smth)?
I tried googling, but i cant find anything like this, probably i'm not searching right.
Please help,
Thanks
Eimis
i made 6 and 8 cells (NiMh 1.2v each) charger, i used power drill battery charger and added voltage regulators into it - 9V 1.5A regulator for 6 cells pack, and 12V 0.1A regulator for 8 cells pack.
Everything works fine:
in beginning of charging regulators works like constant current, at the end they behave like constant voltage source. Current drops very low - something like trickle charging - no battery overheating, or overcharge.
Problem is that the only indication that charging is finished - voltage regulators cools down - means low current is flowing throw them.
Is there any other way to detect end of charging in my case?
Some sort of current threshold (circuit cutoff at low current)?
Or led indication if very low current is flowing? (<10mA or smth)?
I tried googling, but i cant find anything like this, probably i'm not searching right.
Please help,
Thanks
Eimis