He returned with a handful of 1/2 Liter plastic bowls, which he mounted on a PVC pipe drum stand. The piezos were mounted on thin aluminum discs, which were in turn glued to the back side of the ...
Although the spouse approval factor of any of these designs is debatable, at $100, the 55 gallon drum design could provide ... and one constructed out of PVC pipe. The video after the break ...
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