Comment by zipy124 | Hacker News Reader

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Comment by zipy124 | Hacker News Reader

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Yup, on the order of below 100 Hz usually https://en.wikipedia.org/wiki/Extremely_low_frequency .

Below a certain point do you suppose my headphone jack can double as a transmitter?

Technically, yes. Also a lot of people in the amateur radio community use the microphone in as a receiver for VLF transmissions.

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