I am outputting audio from OCR1A (pwm) on a mega1284, passing it through a resistor and then to a 3.5mm jack for headphone connection.
I have been reading around and seen people making home induction loops for impaired hearing, and I wanted to make a portable mp3 player, for my grandad, who already wears an induction capable hearing aid.
So currently everything works on the mp3 side of things - i.e I can output the sound but I want to swap the ack for an induction loop, but not sure about the mathematics, and what is necessary.
I understand the more coils the better, but lets say I wanted to "induce" the audio over a metre, what would I need to think about in terms of circuitry and battery/power source. Could someone give the example calculation please? I assume I can buy an inductor rather than coil the wire myself...