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Toot

Written by josh g. on 2025-01-28 at 03:23

My very own mini FM transmitter lives! Thanks @loriemerson for publishing your excellent how-to zine. https://othernetworks.net/2024/08/20/build-your-own-mini-fm-transmitter/ #networks #radio #diy #electronics

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Descendants

Written by Rue Mohr on 2025-01-28 at 05:38

@joshg @loriemerson just thinking out loud, I wonder if one can do FM by having a timer toggle a gpio pin and using the osc trim as a DAC...

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Written by josh g. on 2025-01-28 at 19:42

@RueNahcMohr @loriemerson I'm not sure if I follow how the osc trim would work, but usually the root problem is, your output freq will be limited by how fast the gpio can change. this'll be no higher than the CPU clock speed (and probably slower).

you'd also want to filter the output so it isn't noisy on higher freqs, probably? maybe?

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Written by Rue Mohr on 2025-01-29 at 01:50

@joshg @loriemerson

[I'm not an RF person]

The idea is that dynamically trimming the cpu oscillator is your FM I think you can get +-25% in some cases.

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Written by josh g. on 2025-01-29 at 03:40

@RueNahcMohr

• read read*

Yeah, I guess that's possible?

@loriemerson

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Written by Lori Emerson on 2025-01-28 at 12:57

@joshg ahhhh it's gorgeous! so glad you made it! @rose_alibi

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Written by a libi rose on 2025-01-28 at 13:50

@loriemerson @joshg ooh excellent! nicely done!

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