| ▲ | MrBuddyCasino 2 hours ago |
| Fascinating. I suppose they can be smaller than quartz crystals? |
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| ▲ | ahartmetz 35 minutes ago | parent | next [-] |
| If you find that fascinating already... did you know that all cellphones use mechanical filters in the GHz range? They combine very good performance with very low energy consumption. https://en.wikipedia.org/wiki/Surface_acoustic_wave https://de.wikipedia.org/wiki/Akustische-Oberfl%C3%A4chenwel... (pictures) |
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| ▲ | MrBuddyCasino 27 minutes ago | parent [-] | | Honestly, the "HF physics is black magic" trope has made me numb to the phantastical contraptions. I appreciate when they look cool, like esoteric orgon wave radiators. | | |
| ▲ | ahartmetz 10 minutes ago | parent [-] | | AFAIK, the black magic factor is much higher for HF electronics than for HF mechanics. It's at least partially because you can build more complex systems with HF electronics. The other difference is that high frequency EM oscillations easily radiate energy in the form of photons, while high energy mechanical oscillations radiate nothing for practical purposes (at least in vacuum), gravity waves if you're being pedantic. |
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| ▲ | drum55 2 hours ago | parent | prev [-] |
| Very little uses crystal oscillators, they’re gigantic compared with electronics today and have very wonky performance over temperature and shock. |
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