I have 4 85ah leisure batteries that are not old but have been left discharged for a month or two.
I have put together the 555 circuit and monitored the battery posts with a scope.
What springed to mind was making a pulse width battery charger,beside charging the battery,it could desulphate too.
Would the battery desulphate faster if say you were to have a 30-40 v dc supply and pulse modulate that to a 12v battery,say at 5% pulse width at 1khz rate?
If the pw waveform had sharp on and off times would this also work to desulphate,as it should cause ringing on the leading and trailing edges?
Driving multiple large fets would be easy at this freq using dil packaged fet drivers,and also they are fired with 5v logic,i use one of these as a squarewave driver in to the gate of fets on a mediumwave transmitter(520-1.6mhz)!
So using the fet drivers at 1% duty cycle at 1khz is no problem.
You could have several taps on the secondary of the transformer to set the unregulated voltage,to use on say 12 and 24v batteries.
Please let me know what you think


