An apparatus for controlling the stimulation of neural tissue which includes a neural stimulator, an input device for providing input to the neural stimulator for neural stimulation, at least one electrode electrically connected to and driven by the neural stimulator and suitable to stimulate neural tissue, a device capable of determining a charge per phase by calculating a discrete integral of the wave form of the input for the at least one electrode, a calculating device for comparing the charge per phase to a predetermined maximum and determining a reduced stimulation for the at least one electrode by the amount necessary not to exceed the predetermined maximum for the at least one electrode, and a current pulse generator for stimulating the neural tissue according to the reduced stimulation level.