And now, yes, it's true - clever folks around the world have developed plans for turning your Arduino, Basic Stamp, PIC, Raspberry Pi or even more basic micro-controllers into an AM or FM transmitter.
Here is a sample of a few of the projects floating around the web:
- First, an IC Robotics Wiki entitled "Turning the Raspberry Pi Into an FM Transmitter" Authors Oliver Mattos and Oskar Weigl tell us their plan "...uses the hardware on the raspberry pi that is actually meant to generate spread-spectrum clock signals on the GPIO pins to output FM Radio energy. This means that all you need to do to turn the Raspberry-Pi into a (ridiculously powerful) FM Transmitter is to plug in a wire as the antenna (as little as 20cm will do) into GPIO pin 4 and run the code posted... It transmits on 100.0 MHz." and includes a video demonstration.
- Julien Camisani has authored a nice PDF telling us about his PIC microcontroller FM transmitter project called Transmitter MP3 via FM 88-108 MHz. Julian has included a full set of PC board patterns, schematic,parts placement and source code for the PIC
- Next, the indefatigable Scott Harden tells us how to build a Simple micro controller am radio transmitter. Scott's website offers a plethora of perspicacious projects and is not to be missed!
- Now appearing on the Internet Archive, an anonymous author shares his project titled FM Transmitter (NS73M based)," Creative Widget Works provides a schematic and a fun hack of a four seat AA battery holder to put this project on the air. In version two of this effort, the talented Mike Yancy takes the project to the next level with an LCD display and more control in his article An FM Stereo Broadcaster - Part 15, Low Power, FM Stereo Transmitter on a Budget
- Not forgetting the AM band, In his blog "Eclectic Technical Experiences, Sivan Toledo's Technical Ups and Downs," the self-described computer scientist at Tel-Aviv University with a fairly wide range of technical interests tells us about his Microcontroller AM Transmitter (and a Lesson in EMI). Lots more good stuff on Sivan's site, go there.