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> You can use a germanium diode or even Shottky now instead of a “crystal”.

Or a razor blade or a piece of roofing lead and a needle.



Now I’m interested…


Diodes occur naturally, all you need to do is find them!

Good places to look for them are conductors and crystals.

https://en.wikipedia.org/wiki/Crystal_detector

https://rimstar.org/science_electronics_projects/razor_blade...

Good luck! And don't sneeze once you've found a good spot.


> Diodes occur naturally, all you need to do is find them!

Even true for LEDs!

https://en.wikipedia.org/wiki/Silicon_carbide#Natural_occurr...

https://en.wikipedia.org/wiki/Light-emitting_diode#History




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