Mikrophonie is a microphone preamp with a piezo contact mic built into the panel.
It is an easy way to bring environmental noise and feedback into a modular system, inspired by the early days of electroacoustic music in Paris and Cologne, and by the contact microphone and phonograph cartridge experiments of John Cage, Gordon Mumma, Robert Ashley and Nicholas Collins. Here is a wonderful film from 1966 of Stockhausen & Co performing Mikrophonie 1.
This is an open hardware project – all the project files (Eagle CAD projects, Gerbers PCB files, Schematics, BOM) are available on this page, covered by a Creative Commons Attribution Share-a-like license, which allows for commercial use.
This is a relatively advanced DIY project, and I’m not able to provide support. I am not selling PCBs, kits or finished modules, but hopefully all the information you’d need is here.
The panel is PCB with no soldermask. The raw PCB fibreglass has quite a nice rough texture – rubbing it with a finger or a plectrum creates quite a wide range of sounds. The back of the panel is plated and grounded for shielding; the peizo microphone can either be soldered directly to the copper or stuck on with epoxy glue.
Mikrophonie 2-2 bom PDF v2 (update 12-7-2014 to correct Mouser number for 20mm Piezo Disk – old BOM had a 27mm disk)
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