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In the early 70's when I would live in the back country for three to four months, I would only have a transistor radio for entertainment. It took 9V batteries and ate them up reasonably quickly. So I rigged up a small solar panel I bought from Radio Shack at the time, used one or more diodes and resistors to regulate and direct the power to play my radio during the day. If I could rig something like that up close to half a century ago, there should be something now to power and store power for a cell phone.
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Marv Evans
'69 911E
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