|May 28, 2012
|May 30, 2012
|ipod solar-battery-charger solar-ipod-charger solar-usb-charger usb usb-charger
Solar charger for batteries and USB (iDevice).
2x 4.5V solar cells (100mAh each) charge an amount of batteries (must be >8V). Here I have 2x AA NiMH, and 1 Sony infoLithium 7.2V battery pack.
Female USB connector charges any device that requires a USB to charge. Like all USB charged devices, Apple products require 5V (the 7805 voltage reducer is used). The two "digital" ports on the USB are for newer Apple products; they require 2V each, given by the 33kOhm reducers.
Solar cells have a secondary circuit to directly trickle charge USB.
Yellow LED = solar only power to USB Red LED = batteries charging Green LED = battery only power to USB
Voltage must be above 8V for 7805 Voltage Reducer to output the required 5V.
7895 Voltage Reducer will overheat if both solar and battery power are active.
PLEASE TELL ME IF THERE IS AN ERROR, AS MY PARTS HAVE NOT YET ARRIVED AND THIS IS ONLY A THEORETICAL CIRCUIT.
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