A solar boombox: because you want to listen to music in the park without purchasing expensive batteries that are bad for the environment; because you don't want to run a cord into your yard while you work; or maybe just because you can.
There are a several solar powered boom boxes floating around on the web. The one pictured above, from Instructables, is my favorite.
According to the author, you can construct a solar powered boombox for as little as $75 by utilizing a small, energy efficient amplifier, cheap bookshelf speakers, battery, a small solar panel, and your own audio input. Supposedly, the Sonic Impact digital amplifier will run directly off a single 1.5 watt solar panel. In case you haven't heard of the Sonic Impact, it's an impressively low power, high quality amplifier that can be purchased for less than $30 (the small gray box in the setup below).
I won't go through all the steps here - you'll have to visit Instructables for the full diy, but here is a list of the materials and tools you' need:
- Solar Panel
- Various plugs and jacks
- A Battery
- An enclosure
- Soldering iron
- Wire cutters/strippers