This solar clock was developed utilizing a great deal of salvaged parts. We discover it fascinating that [Nereus] integrated a sound of storage capacitors with a power cell (translated) to produce a hybrid energy storage setup.
The device translation makes it a bit rough to comprehend exactly how this works, however the schematic assists rather a bit. The pair of solar cells, which were pulled from some affordable solar cellphone chargers, feed the bank of capacitors encircling the clock face. If put in a space that gets lots of sunlight the cells will top off the capacitors which then feed an ICL7663 regulator. We’d like to hear comments on this part choice, as it’s our experience that linear regulators are rather inefficient. however anyway, the regulated power feeds both the energy cell in addition to the clock motor. When output from the regulator dips the battery picks up the slack. The job likewise includes a voltometer as well as thermometer which can be displayed on the small LCD screen just about the six o’clock tick mark.
Now if you want something totally battery-free you’ll have to inspect out [Jack Buffington’s] handle solar clock.
[Thanks Manekinen]