Transmit and Receive using the Headphone Jack (with Espruino)

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A post on how to do this (with links to code and circuits) is here:

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"FSK without the need for an Arduino jack modem" => thanks Gordon ;p

-> nb: updated post on Epruino forums for Audio Circuit ( .. )

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Snozlo
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Hello where can i get a audio-cable like that?

jfuruskog