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Frequency Shift Keying - A digital transmission technique in which a "1" is represented by one frequency and a "0" by another. It is the digital equivalent of FM.

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Understanding this circuit for getting sensor data from an arduino to a phone via the headph...

I am trying to understand the circuit below which relates to getting sensor data from an arduino to a phone via the headphone jack. The instructions on this page aren't clear on what the function of …
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