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For the 18V +/- NIMH battery pack (2 x 9V packs in series @ 200mAh) that I use to run my phono preamp, I need a simple trickle charge circuit. The LM317 IC seems to be the one that is used a lot. Does any one have a proven circuit that would work with a very low charging current of say around 20-30 mA?

Thanks

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  • \$\begingroup\$ Why not use the LM317 circuit that you already found? It's usually very simple to change the current limit. \$\endgroup\$
    – Dwayne Reid
    Commented May 11, 2015 at 23:31

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I am no expert as I recently asked a similar question about a circuit I'm designing for an NiMH battery charger, but from the feedback I got, it would seem that a circuit with a current that low wouldn't need much protection. You can see the responses I got at Solar Cell - Preventing overcharge of an NiMH battery.

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