Instrument builder and kinetic artist Matt Steinke's latest creation is a MIDI-controlled device that sounds a lot like the 8' and 4' flute stops on a church organ, but uses electromagnetically energized tines (think Rhodes electric piano) to achieve that sound. From the artist's decscription:
"The tine organ is a MIDI controlled portable acoustic organ with the dimensions of 4”x13”x14”. Although it sounds like a pipe organ in a cathedral, its sound producing mechanisms are very different. Instead of pipes and a wind chest, it uses electromagnets and steel tines to produce 20 chromatic notes starting at middle C with full polyphony. Each tine is coupled with an electromagnet that outputs PWM at its fundamental pitch. The pull and release of the tine by the magnet causes a sustaining effect. The soundboard under the bridge is mahogany and the body is made of bubinga. Inside it houses a small Arduino micro-controller that accepts MIDI input that controls 20 polyphonic software oscillators (like 20 function generators) which are stepped up to 30 volt pulses though three ULN 2803 Darlington drivers to the magnets."