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In 1919 Leon Theremin made an interesting instrument called the Theremin, it works a bit like a metal detector, and was the first musical instrument designed to be played without using your hands – here’s how to make one from “Popular Electronics November 1967”Link.

Related:

  • Optical theremin + soapdish – Link.
  • DIY RCA Theremin Replica – Link.
  • What is a Theremin? – Link.