GZ series of electro-magnetic vibrating feeders can be widely used in metal-working, coal, electricity, machinery, chemical, building material, light industry, cereals, and many other industries to evenly and continuously feed lump, grain, or powder materials from hopper to receiver at fixed rate. GZ series of electro-magnetic vibrating feeders have following characteristics: 1. SCR half-wave rectifying circuit is used, and feed volume of machine may be infinitely adjusted within rated capacity.