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> without external power. The radio transmitter is the external power. The crystal set is a way to grab a tiny amount of the electrical power being paid for by
by msla 3y ago
> without external power.
The radio transmitter is the external power. The crystal set is a way to grab a tiny amount of the electrical power being paid for by whatever entity is running the transmitter. You can play around with the inverse square law and figure out how little power the set is grabbing, but it's working on the basis of what it does grab.
- interroboink 3y agoReminds me a little of "The Thing"[1] — remarkable WWII-era passive listening device. [1] https://en.wikipedia.org/wiki/The_Thing_(listening_device) https://en.wikipedia.org/wiki/The_Thing_(listening_device)
- somat 3y agoThere is an excellent youtube series where "the thing" is recreated. There is a lot of subtle design involved. https://www.youtube.com/watch?v=NLDpWrwijE8 https://www.youtube.com/watch?v=NLDpWrwijE8
- archo 3y agoA Crystal Radio Receiver, also called a Crystal Set : https://en.wikipedia.org/wiki/Crystal_radio https://en.wikipedia.org/wiki/Crystal_radio