I built a pair of planar magnetic headphones - basically just because I though the operating principle was interesting. After several catastrophically bad-sounding attempts, I eventually built a version that sounded decent and looks pretty good:
The drivers are meticulously hand-etched from the thinnest flex-pcb material I could find. The driver membrane is sandwiched between an arrangement of magnets embedded in the aluminum grill that makes up most of the structure of the headphones.
See the build-log here for details
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