Crystal Radio--DIY Crystal Earphone

Quality crystal earphones have become a bottleneck in making crystal radios. But as of today, NO MORE! You can now make an earphone with equal sound quality, because it uses the same piezoelectric element, AND I have made an option to have a rubber earpiece for (GREATLY) improved comfort.

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 porus and not hygenic. 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.

3D PRINTER FILES: https://www.thingiverse.com/thing:6888288

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

Specifications Of The Originals:
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
I Used:
Wire dia (measured): 0.38 mm (21 AWG or 22 AWG) twisted pair hookup wire 3-4 turns/inch (2.5 cm). 120-140cm meters long

30 AWG cable (multi strand wire) PVC Grey
Ethernet cable flex type twisted pair might work.

Видео Crystal Radio--DIY Crystal Earphone канала tsbrownie