Abstract: A control for regulating the AC voltage provide to a vibratory feeder, which includes electronic circuitry for generating a "desired" voltage signal, feedback circuitry for generating an "actual" voltage signal, a logic circuit for comparing the "desired" and "actual" voltage signals and generating a difference signal, and a controller which uses the difference signal to generate a control signal for regulating the AC voltage provided to the feeder. An initialization circuit enables the control a predetermined time after AC power is applied and an automatic relay couples a DC power source to the control for selective adjustment of the control output. A fault circuit automatically shuts down the control if the feedback signal is lost when the "desired" voltage signal is at or turned down to a predetermined level. A maximum AC output indicator identifies the optimum setting for a maximum output adjustment, regardless of load, and a ramp function determines the build-up and decay of the AC output voltage.