Charge Lead acid, non rechargables, rechargable battery's.
With this technique you can revive your dead battery's.
Super simple but very effective :-)
Please build, test and let me know what you think !
And last but not least.. SHARE !
(addition. Transistor can be 2N3055)
3 diodes (one over source not neccecary for operation) 1 resistor 100 ohm to 330 ohm. 1 pot meter 1 K ohm. 1 2N3055 transistor. 1 toroid, Wire, connected like a bifilar coil wound on the toroid. A powersource, your battery's to be charged/and/or to be desulphated.