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Circle of 5th, aka The Tone Circle

Narrative
This was created to demonstrate a range of techniques. The capacitive sensing has been set to detect fingers on contact with the keys. The keys are made from strips of printed circuit board and arranged in a circle purely for artistic merit so as to distinguish this device from a conventional keyboard. It's original purpose was to demonstrate "Circle of Fifths" before being re-purposed as an electronic flute. It's main purpose is that of a "perception challenger" i.e. you do not necessarily have to follow conventional form factor to make a musical instrument. e.g. students at Electric Umbrella quickly caught onto how to trigger sounds.


Components / Devices Description / Hardware Functional Areas
Circle of 5th's Tone Circle This was originally designed as a perception challenger / music tech demo. However it proved to be surprisingly effective in group work. It was passed from person to person. Individuals could explore making sounds by touching the capacitive electrodes. For this purpose it was re-programmed back to a "MIDI" electronic flute in the key of C.
Cof5_Construction The base unit was made of 7 ply. The electrodes were made from blank PCB cut to size.
Bare Conductive Board

Bare Conductive

  • This is a multifunction board that combines.
  • Sound file playing (MP3 or MIDI)
  • Capacitive Sensors
  • On board processor (Leonardo eqv of an Arduino).
  • Can be powered by LIPO battery or external regulated 5v supply.
Bare Conductive Touchboard

The touch board in situ. From experience I found it prudent to mount the on a solid surface They tend to flex other wise resulting in bits of surface mount pinging of. It get it's 5 v supply from a regulator located by the battery compartment.

It uses bar conductive standard MIDI software example, but tweaked to a flute rather than a piano (suits the speaker size better and the sound carries better in a noisy room).

NB nylon nuts and bolts used as the connecting pads are very close and ordinarily nuts cause a short circuit.

Amp and power 9v battery powered the class- D amp which powers the speaker.
Cof5 Speaker

Speaker mounted in "Infinite Baffle". Seems to work fine. Note acoustic padding to stop unwanted vibration.

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