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Crystal radios are probably the earliest case of devices powered by radio waves. https://en.wikipedia.org/wiki/Crystal_radio https://en.wikipedia.org/wiki/Crys
by Zenst 7y ago
Crystal radios are probably the earliest case of devices powered by radio waves.
https://en.wikipedia.org/wiki/Crystal_radio https://en.wikipedia.org/wiki/Crystal_radio
- 52-6F-62 7y agoAh that brings back fond memories. I built one of those as a kid (from a kit). You had to wind your own coil and everything. It was thrilling to get it working.
- iNate2000 7y agoThat's my biggest complaint about digital broadcast. On the other hand - AM broadcast is still totally analog, so a crystal radio should still work! I should order a kit right now!
- tyingq 7y agoA "foxhole razor blade" crystal radio kit is an interesting offshoot.
- felipemnoa 7y agoThanks for this. I had no idea this was possible. Nice little project to try.
- laumars 7y agooh likewise. I remember being completely amazed by the thing. To extend the other comment about FM being digital (in the UK): so much tech we take for granted now is built upon layers upon layers of underlying technology. Devices have never been better but at the same time it's a real loss that we can't build stuff from scratch any longer. I learned so much as a kid from building - often bad - things.