Grandad Bob. For distance reception a large external aerial will greatly enhance the performance of this little receiver. This simple set needs high impedance headphones or the crystal earpiece that is supplied.
eBay
You'll also get a bonus: your DIY AM radio will function as a radio tuner! AM radio stations can be picked up and played using this electrical circuit. Crystal radios don't use batteries or connectors for power; instead, they harness the energy of the radio waves themselves.
eBay
Without an external variable capacitor the on board coil ( Inductor) should pick up Radio 5 Live ON 909KHZ, this may be different in your area so an external capacitor may be required. Any Variable capacitor from an old radio should do.
eBay
ROBERG HARDWARE COMPANY GERMANY CRYSTAL RADIO SET RETRO VINTAGE
eBay
Inside circuitry Hasn’t been inspected. Untested sold for display.
eBay
Flights of Fancy Radio Receiver - Make a crystal radio just like grandpa made.
eBay
Without the variable capacitor the on board coil ( Inductor) should pick up Radio 5 Live ON 909KHZ, this may be different in your aerial so a tuning capacitor may be required. A small 6mm 120pF capacitor will be included but reception may be much improved with a vane type capacitor.
eBay
This DIY radio assembly kit is designed for enthusiasts who enjoy hands-on projects. The kit includes all necessary components to build an radio circuit board. The finished product is a functional radio, great for hobbyists and learners alike.
eBay