Instructables user justwags made a solar powered pocket radio inspired by the 80’s Sanyo RP-AMT2 that can play for about 4 hours on 1 hour of charge or about 38 hours when fully charged:
The key component is the Epeas Solar Energy Harvester, which acts as the controller and handles the battery charging, maximum power point tracking, and has two regulated voltage outputs, making the setup of the radio a breeze while also being able to sip every photon and put it into the battery. The radio module is a digital micro FM receiver from 70-108MHz and uses 25mA at 1.8-3.6V. The cord for the headphones acts as the antenna for the radio.
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