For this years science fair project, I plan on testing standard batteries, and seeing if they will take a charge (I know this is possible). I plan on constructing at least 3 circuits for use in testing. I will build a circuit to discharge the batteries(1.5v cells), a constant current charger with an lm317 regulator, and a "pulse" charger.
My question is this: to build a pulse charger, could I use something as simple a 555 and a transistor/FET to discharge say a 4700uf cap at 1.5v into the battery? Or is something more complex needed to keep the cells from exploding?
My question is this: to build a pulse charger, could I use something as simple a 555 and a transistor/FET to discharge say a 4700uf cap at 1.5v into the battery? Or is something more complex needed to keep the cells from exploding?