How To Turn a Playing Card Into a Solar-Powered Battery Charger
This cheap and easy project only takes 10-15 minutes to do, however you will need a couple of PV silicon cells. Other than that, they only parts you really need are a playing card, some solettes, some magnets and super glue. Solettes can be purchased from suppliers in China, such as these.
The complete material list is: copper tape with adhesive backing, super glue, a couple of playing cards, 4 NdFeB magnets between 1/4″ – 1/2″ diameter, 1/32″ – 1/8″ thick, 4-8 solettes (depending on what type of additional indicators or dark-current blocking diodes you add to the basic charger) and a few AA rechargeable batteries.
Optional extras include a schottky diode, an indicator LED and some form of rigid backing such as a scrap piece of 1/8″ thick acrylic. Once you’ve assembled all those parts, you’re good to go!
Click here to download a PDF of the complete instructions or alternatively, watch the below video.