This is another good use for the solar panel used on the huge amounts of garden LED lights around, coupled to a portable radio that runs off 2 or 3 AA cells.
Most of us have an old radio lying around, so I based the $5 price on the cost of purchasing/ acquiring a solar powered garden L.E.D light.
I suspect there are plenty of scrap ones lying around, not working because of slightly corroded battery terminals in damp environments - the solar panel will probably be perfect....
With this Instructable I have left my radio on now for 4 weeks, (12 hours a day) while I work and it has never let me down, even at a reasonable high volume level.
You could either leave the solar radio out on a sunny wind sill as I do or leave it in the sun outdoors - every so often to recharge the battery's.
Step 1: Step 1
What you will require:
1. A portable radio, AM/FM or DAB, (2AA or 3AA battery type).
2. One 4 or 4.5v 80 mA solar panel, prised off from a Solar Light.
3. ideally a BAT43 Schottky diode or Silicone IN4001 (more voltage loss)
4. soldering iron, solder and red and black cable 6" lengths.
5. 2 or 3 NiMh rechargeable batteries (NiCd are ok but not as good) minimum capacity 800 mAh per battery.
Optional - heat shrink sleeving, Adhesive foam strip
This is a very quick project, that can be made in about 2 hours, and helps save the planet :)