A biofeedback electronic stimulation device includes a processor for generating a first control signal and a plurality of second control signals responsive to at least one input signal. Transformer circuitry generates a stimulation signal including packets of at least one pulse responsive to the first control signal. Pulse circuitry configures the at least one pulse in the packet to a selected one of a plurality of configurations responsive to the plurality of second control signals. Output electrodes apply the at least one pulse in the packet to a user and detector circuitry detects zero crossings of the at least one pulse in the packet. The processor further causes generation of an indicator responsive to the detected zero crossings.