The compact, self-contained vibrating feeders with a built-in bulk hopper inlet has an integrated hopper and feeder design that relies on the actuation of two electrical vibrators to ensure a constant, reliable flow of castings, billets and other large parts. The design is also suited to a number of applications in the plastic, processing, powder, pharmaceutical, food, chemical and foundry industries. Engineered for continuous flow control, the feeder eliminates the need for steeply-angled hopper walls associated with gravity hoppers. The units offer a lower overall height and hopper walls angled at less than 30 degrees for reduced material dump height. An adjustable swing out gate further aids in flow control and reduces the potential for hang up as material moves from the hopper to the feeder tray. The feeders can easily be equipped with independent variable frequency controls for adjusting flow rate. Special control features are available where timed feed rates or operation from a scale signal are required.