Buy the voltage regulator here: http://www.banggood.com/10Pcs-L7805CV-TO220-L7805-TO-220-7805-LM7805-MC7805-Original-IC-p-1070097.html?p=SK081032330962015126
In this video I show you how to build a 5V USB solar powered charger. Let me know if you have any questions!
Item list
5V regulator LM7805: $0.50
9 Volt, 3.3 Watt solar panel: $15.00
AAA battery enclosure: $1.00
Wire: salvaged
Total: $16:00
Post time: Jun-17-2017