DIY Crystal Radio Earphone VERSION 2

Summary

This is an updated version of my earlier earphones. About a 20% improvement. Support is not needed. Sound is a bit louder / clearer. The stl files are simpler. These are multiple designs for a crystal earphone. One type is the historical plastic ear insert part. The other uses a popular rubber insert. You need to supply the sound element and wire.

IMPORTANT NOTE: 3D Printed parts are porous and not hygienic. They may also be rough and, depending on your printer, may have sharp edges and protrusions
that need to be taken care of before using. It you have any doubts, DO NOT USE THEM.

Piezo electric element: 20mm dia
Rubber Eartip: Xiaomi Mi 13mm x 8mm / 4.4mm hole
Wire dia (measured): 0.38 mm (21 AWG or 22 AWG) twisted pair hookup wire

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Specifications Earphone:
Impedance: 20K ohm
Resistance: 20M ohm
Capacitance: 15,000 pf
Sensitivity: 57db at 1KHz
Frequency Range: 200 - 8,000Hz
Operation Temperature: -20 to 60 degree Celsius
Wire: 42-inch Molded twisted Wire
Connector: Tinned Leads for DIY Connections

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PRINTER SPECS

Maximum quality
Low toxicity, flexible filament
Support is not needed