Variometer FM Crystal Radio
   • Variometer FM Crystal Radio  

Copper tube loop FM Crystal Radio
   • Copper tube loop FM Crystal Radio  

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Or you can buy the electronic components or any other amazon products through these amazon links. There will not be a price difference to you, but will mean a lot to me.

Here is a list of items that you may be interested in

A low cost high quality 3D Printer that I recommend.
Official Creality Upgrade Ender 3 V2 FDM 3D Printer with Meanwell Power Supply Silent Motherboard Carborundum Glass Platform and Build Volume 220 x 220 x 250mm
https://amzn.to/2F4U9rq

To DIY a good quality crystal radio earbud from a piezoelectric buzzer that has equal or even better performance than a genuine crystal radio earbud

6 Pack 324v Piezo Electric Tone Buzzer Alarm dc 324 v for Physics Circuits Continuous Sound
https://amzn.to/2QXPSZC


Genuine Crystal Radio Earbud (warning for reference only, these earbuds often got connectivity issues where the contact with the internal disc is loose and will loose after a few months of use and hard to repair. So, it may be much better to DIY one using the buzzer (see above). However, if you just want to have a few of the genuine crystal radio earbud, it’s no harm to buy one for collection purposes knowing that it may fail in some time due to contact loosening issues).

Crystal Radio Earphone, High Impedance, 3.5mm jack
https://amzn.to/33ezHNp

Philmore Crystal Radio Earphone to Stripped and Tinned Bare Wire, 7Ft Cord, High Impedance 748
https://amzn.to/2QRaEKq

Germanium Diodes for AM Crystal Radio
MCIGICM 20Pcs 1N34A 1N34 Germanium Diode 50mA 65V DO35 (DO204AH) Axial
https://amzn.to/2F3yLCT

Schottky Diodes for AM Crystal Radio
10 pcs of 1N60P 1N60 SCHOTTKY DIODE 45V 30mA
https://amzn.to/2QUMXRl

To make a variable capacitor for FM Crystal Radio
4" X10" X.025 Copper Sheet Metal
https://amzn.to/320DXAD

To make high Q FM radio coil
Cerrowire 0502000A 25Feet 8 Gauge Bare Solid Copper Wire
https://amzn.to/32YQELt

To make AM radio coil
BNTECHGO 22 AWG Magnet Wire Enameled Copper Wire Enameled Magnet Winding Wire 4 oz 0.0256" Diameter 1 Spool Coil
https://amzn.to/2F1R0Jl

To make AM radio coil
BNTECHGO 24 AWG Magnet Wire Enameled Copper Wire Enameled Magnet Winding Wire 4 oz 0.0197" Diameter 1 Spool Coil Red
https://amzn.to/2GlNEkz

To make AM radio coil
BNTECHGO 28 AWG Magnet Wire Enameled Copper Wire Enameled Magnet Winding Wire 4 oz 0.0122" Diameter 1 Spool Coil Red
https://amzn.to/2Z557Eq