A simple amp built from a kit attached to my rudimentary plank and can banjo by way of a piezo transducer- this picks up the physical vibrations of the strings in a flat piezoelectric crystal that produces equivalent in electric pulses (flexing piezoelectrics releases electricity). This is the audio signal.
apparenty the vibration of the tin body carries all the strings' vibrations through its own key, so they are all just different tones of the same note. (i may have got this wrong..)
Anyway, through the massive sound system it made your ears bleed, though its hard to hear in the video.
Next step: humbucker pickups and a solid body banjo!
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