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audioFM

Do you want to listen to MP3 on your radio? But yout radio doesn’t have a AUX IN or any other Input? Then audioFM can help you. audioFM takes audio signals from a headphone plug and converts it into radio UKW FM signals.

The heart of this small FM Modulator is a tuneable voltage controlled oscillator (VCO) from Maxim-IC called MAX2606. This VCO operates from 70MHz to 150MHz and has a up to -8dBm differential output amplifier.

Note: in many countries it’s not allowed to broadcast in the UKW (normal Radio) frequency bands!! So use this at your own risk!

The schematic:

audioFM schematics

Simple & small! The PCB only measures about 28 x 22mm!!

audioFM PCB

The audioFM project is based on schematics found in the Internet and from Elektor Magazine!

This entry was posted on Monday, December 25th, 2006 at 11:47 and is filed under other. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

3 Responses to “audioFM”

  1. Thomas Says:
    June 25th, 2007 at 19:41

    Hello Tobi,

    can I download the PCB of the ausioFM at your homepage?

    bye
    Thomas

  2. theFloe Says:
    June 28th, 2007 at 18:25

    Sorry, but I can’t find the files any more…

  3. Sven Says:
    February 26th, 2009 at 11:07

    Made the same thing and it works great! It has a range of approx 10m. Although the outgoing signal is mono, the sound is very good. Noise zero :D .

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