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Cool Components - Arduino, Raspberry Pi, Sparkfun, Adafruit, mbed and lots more...
Raspberry Pirate Radio | MAKE
Raspberry Pi Radio Transmitter
Pi as MP3 FM radio transmitter
Turning the Raspberry Pi Into an FM Transmitter - Imperial College Robotics Society Wiki
Create an Internet Radio FM Transmitter | Weed Pi
RadioPi (Cheap Remote Monitoring!) | Andy Pi
DS18B20 temperature sensing | OpenEnergyMonitor