Thanks for the drawing,
I have been thinking about the h bridge during the afternoon and it seems that there are basically two circuits, and that when you turn one supplying transistor on, you also turn on the corresponding grounding transistor in order to not have the two powering ones short out .
Having thought a bit about the plan, (to convert the servo) it seems clear that i need two outputs in order to control the two halves of the h bridge, I guess that what i need to do, is look at the existing h bridge, trace the tracks back to the microprocessor on the servo board and build my h bridge from there, leaving the original one disconnected,
other than that i dont see a way of acheiving the goal,
and i assume that if i just were to remove the fets on the board, and upgrade them that the diodes etc and board traces would burn out under the new, higher load,
do all four fets need to be the same? i soppose i need two npn and two pnp, as long as all four can handle the nominal amperage needed i can have the pnp ones at a higher rating without problems no ?