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If you want to build fully legal applications that transmit FM you can use the Si4713. https://learn.adafruit.com/adafruit-si4713-fm-radio-transmitter-with-rds

If you want to build fully legal applications that transmit FM you can use the Si4713. https://learn.adafruit.com/adafruit-si4713-fm-radio-transmitter-with-rds-rdbs-support https://learn.adafruit.com/adafruit-si4713-fm-radio-transmit... John Park did a short video on it https://www.youtube.com/watch?v=PKP6Z-cEbFQ https://www.youtube.com/watch?v=PKP6Z-cEbFQ You can also buy a fully legal MP3 FM transmitter. https://radiofidelity.com/best-fm-transmitter-for-your-car/ https://radiofidelity.com/best-fm-transmitter-for-your-car/ Bitluni made a fun (illegal) AM radio transmitter with an esp32 https://youtu.be/lRXHd3HNzEo https://youtu.be/lRXHd3HNzEo

anthk 4y ago
I would like an USB FM transmitter which shows up as an USB audio card. You set the sound card output at your OS settings and everything it's broadcasted over FM. I know some of them exist for bluetooth audio, but not for FM.
- rahimnathwani 4y ago
  It would be cool to have this in one unit, but it's also easy to put together by combining two readily-available devices: - a USB sound card with 3.5mm jack, and - an FM transmitter module (which can usually be powered with 3v-12v, so should be able to work with 5v USB power
- aussiegeek 4y ago
  This is an interesting challenge, would be a great homebrew project. (If I wasn't already neck deep in interesting challenges I would consider picking this one up)
rahimnathwani 4y ago
The 'Roav by Anker Bluetooth FM transmitter' is amazing. So much better than the generic ones, and well worth the extra money. It provides a good signal, is easy to adjust, and works well for phone calls (not just music).
- knaik94 4y ago
  Does it output music in stereo with separate left right channels? The few I tried treat all audio as a mono source, throwing away the left or right track. Searching amazon reviews for this information has been frustrating because stereo can also refer to the head unit and speakers. The NULAXY had this issue for me.
  - rahimnathwani 4y ago
    "Does it output music in stereo with separate left right channels?" Sorry, I don't know. It's in my parents' car, so I won't be able to check until the next time I visit them.
samstave 4y ago
I want a damn CELLPHONE with FM/AM radio RECEIVER! So you can get radio when there is no cell or data service - like when camping or hiking etc.
- andrewstuart 4y ago
  I believe the iPhone has such a receiver but it’s not enabled.
- Keyframe 4y ago
  Mobile phones have regressed in several areas. This is one definitely.
- aidenn0 4y ago
  Most Android phones with a 3.5mm jack have this
- tetris11 4y ago
  The Nokia N900 has an FM transmitter built in

anthk 4y ago

I would like an USB FM transmitter which shows up as an USB audio card. You set the sound card output at your OS settings and everything it's broadcasted over FM. I know some of them exist for bluetooth audio, but not for FM.

rahimnathwani 4y ago
It would be cool to have this in one unit, but it's also easy to put together by combining two readily-available devices: - a USB sound card with 3.5mm jack, and - an FM transmitter module (which can usually be powered with 3v-12v, so should be able to work with 5v USB power
aussiegeek 4y ago
This is an interesting challenge, would be a great homebrew project. (If I wasn't already neck deep in interesting challenges I would consider picking this one up)

rahimnathwani 4y ago

The 'Roav by Anker Bluetooth FM transmitter' is amazing. So much better than the generic ones, and well worth the extra money. It provides a good signal, is easy to adjust, and works well for phone calls (not just music).

knaik94 4y ago
Does it output music in stereo with separate left right channels? The few I tried treat all audio as a mono source, throwing away the left or right track. Searching amazon reviews for this information has been frustrating because stereo can also refer to the head unit and speakers. The NULAXY had this issue for me.
- rahimnathwani 4y ago
  "Does it output music in stereo with separate left right channels?" Sorry, I don't know. It's in my parents' car, so I won't be able to check until the next time I visit them.

samstave 4y ago

I want a damn CELLPHONE with FM/AM radio RECEIVER! So you can get radio when there is no cell or data service - like when camping or hiking etc.

andrewstuart 4y ago
I believe the iPhone has such a receiver but it’s not enabled.
Keyframe 4y ago
Mobile phones have regressed in several areas. This is one definitely.
aidenn0 4y ago
Most Android phones with a 3.5mm jack have this
tetris11 4y ago
The Nokia N900 has an FM transmitter built in