Good afternoon,
Two years ago, I built a trickle charger like the one below:
http://www.head-fi.org/t/185377/trickle-chargers/45#post_7100643
I'm using it with a 24v wall wart, to charge two 8,4v NiMH PP3 batteries. I've set the output voltage to 21, choosing the right resistor in the LM317 circuit, and limiting the charging current.
Now, I'll want to use the same power supply to charge three 8,4v NiMH PP3 batteries. So, I can't assemble the batteries in series, otherwise I would need 31,5v. I thought I could build it in parallel, but I have read that it is not advisable.
If I build three circuits like the one above, and connect them all to the same wall wart in parallel, will it work, and would it be safe? Or does it have the same problem of charging NiMH batteries in parallel?
Thanks in advance.
Two years ago, I built a trickle charger like the one below:
http://www.head-fi.org/t/185377/trickle-chargers/45#post_7100643
I'm using it with a 24v wall wart, to charge two 8,4v NiMH PP3 batteries. I've set the output voltage to 21, choosing the right resistor in the LM317 circuit, and limiting the charging current.
Now, I'll want to use the same power supply to charge three 8,4v NiMH PP3 batteries. So, I can't assemble the batteries in series, otherwise I would need 31,5v. I thought I could build it in parallel, but I have read that it is not advisable.
If I build three circuits like the one above, and connect them all to the same wall wart in parallel, will it work, and would it be safe? Or does it have the same problem of charging NiMH batteries in parallel?
Thanks in advance.
