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:
Simple & small! The PCB only measures about 28 x 22mm!!
The audioFM project is based on schematics found in the Internet and from Elektor Magazine!
June 25th, 2007 at 19:41
Hello Tobi,
can I download the PCB of the ausioFM at your homepage?
bye
Thomas
June 28th, 2007 at 18:25
Sorry, but I can’t find the files any more…
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
.