Re: An Elektor reader's AM TX (inductive)
On further glance I would probably use the Arduino for the RF frequency and a single transistor modulator with a fixed tuned circuit on the output. More traditional and not quite in keeping with this article but a simple circuit (in basic form) which would be cheap in parts and re-tuneable in the fixed steps of Arduino timer output. With the tuned circuit frequency multiplication would be possible with reasonable harmonic performance at low output levels.
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