Hi , a friend had the idea that the I2S can also be used for other purposes . This time nothing digital , but " retro " Analog .
I2S should be fast enough to achieve a few hundred kilohertz with Pulse Density Modulation (<-not "PWM").
The ~100-1000KHz sine PDM, AM-modulated it should give a Longwave/Mediumwave-Transmitter (with audio D/A resoulution of a few bits), as output-object for the audiolibrary and with minimum external components.
Ideally, the only external component should only be a short wire as antenna, but maybe it is a good idea to add a low-pass filter to "smooth" the PDM?
I have no experience with something like this, but i think it is fun to try it.
A range of a few meters would be perfect.
My question is, if someone is willing to help with the electronics or can give tips regarding the antenna and the low-pass filter.
Edit: https://en.wikipedia.org/wiki/Pulse-density_modulation
I2S should be fast enough to achieve a few hundred kilohertz with Pulse Density Modulation (<-not "PWM").
The ~100-1000KHz sine PDM, AM-modulated it should give a Longwave/Mediumwave-Transmitter (with audio D/A resoulution of a few bits), as output-object for the audiolibrary and with minimum external components.
Ideally, the only external component should only be a short wire as antenna, but maybe it is a good idea to add a low-pass filter to "smooth" the PDM?
I have no experience with something like this, but i think it is fun to try it.
A range of a few meters would be perfect.
My question is, if someone is willing to help with the electronics or can give tips regarding the antenna and the low-pass filter.
Edit: https://en.wikipedia.org/wiki/Pulse-density_modulation
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