audio transformer + crystal oscillator + battery = AM radio
At scitoys.com
http://scitoys.com/scitoys/scitoys/radio/am_transmitter.html
source of radio parts for this type of project:
http://www.scitoyscatalog.com/category/R.html
Radio Shack has audio transformers…
http://www.radioshack.com/product/index.jsp?productId=2103254
http://ossmann.blogspot.com/2010/03/16-pocket-spectrum-analyzer.html
Music “mashup” creator.
By Mixed In Key
Web Audio synthesizer
By Alex GIbson
radio experiments
from nwdigitalradio
http://nwdigitalradio.com/blog
Convert 1-50 MHz into the VHF range (~100 MHz) for Funcube (and rtl-sdr).
By George Smart, M1GEO
http://george-smart.co.uk/wiki/FunCube_Upconverter
Model FCD-1-55-UC 1 to 55 MHz Up Converter
By High Sierra Microwave
http://www.hsmicrowave.com/FUNcube%20Dongle.html
Sheevaplug
http://hackaday.com/2012/07/09/software-defined-radio-remotely-using-a-linux-wall-wart/
By Embedded Newbie
http://embeddednewbie.blogspot.com/2011/02/review-of-arduino-dac-solutions.html
