"Tesla’s Spirit Radio uses a simple crystal radio circuit connected to a computer sound-in jack to generate spooky sounds from all kinds of electromagnetic sources."
In other words, and early Theremin.
http://aetherforce.com/build-the-spirit-radio-that-creeped-out-tesla-himself/
Not quite. A theremin has two oscillators tuned to the same frequency and you detune one to create a beat frequency. I think the two spaced spiral antennas cause a beat from a common radio source depending on the angle of orientation of the source to the antennas.
ReplyDeleteAn "auto-Theremin" then. ;)
ReplyDelete