The DIY solar boom speaker system
If you are somebody that likes to spend their time down at the beach but at the same time would like to blast out you music really loud, then maybe this is the sort of thing that you could do with.
The DIY solar power speaker system for your tiny Mp3 player, this thing can be made for around $75, the most expensive item is the amp, and the solar panels are around $15. But maybe these could be bought second-hand at half the cost, which really reduces the overall cost.
Source [Planet Green]
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