Hellduino: Sending Hellschreiber from an Arduino
Update: Welcome Hack-a-day readers! If you are looking for the schematics for this “transmitter” (really just a simple oscillator, send some love to radio guru Steve Weber over at his website. You could really use any oscillator you like, even a canned oscillator (although the square waves would generate lots of harmonics). Yesterday’s project coupled [...]

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