“The heart of the Hammond B3 Organ is the tone generator. This iconic jazz instrument relied on a series of metal disks each with a varying number of bumps along the edge. Those bumps allowed the metal disks when spun to warp the magnetic field of the electromagnetic pickups inducing current and producing near perfect sinusoidal signals. Those signals were then actively summed to produce the wide range of notes and tones needed for the organ. The Hammond B3 could produce seven and a half octaves using 91 separate disks. This technology ceased to be used for instruments with the advent of digital technology but it remains a forever desired sound and a fantastic demonstration of basic electrical engineering principles. The following will describe the construction of a very basic, single octave tone generator, based on the principles described above. It is a rough design in need of improvements that will be described at the end of the instructions. This Electromechanical Tone Generator was designed as a project for the Electrical and Computer Engineering Department at Utah State University.”