concerning semi-dead lead batterys

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I found this http://hmin.tripod.com/als/andysm/docs/Lin_Jao2.pdf that discusses the circuit from the Home Power magazine.

I'm too am looking for a battery desulphator circuit to build - just wondered if anyone has built this design and how successful it was or perhaps can comment on the circuit design.

Thanks

I built one of those from junkbox parts.I'm not sure that the coils are correct but it does seem to help,it takes some time though.
 
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