* Will not work with all phones or usb battery chargers.*
The protection diode is critical when used with digital meter for protection of usb devices seeing the residual panel voltage in the digital meter's caps.
Schematic-
http://img217.imageshack.us/img217/9255/89421879.jpg
Works with any solar panel 7-30 volts.
DC converter specs
Input Voltage Range = 7V-36V
Output Voltage = 5 V
Output Current ≤ 1.5 Amps (1500mA)
Mouser Part #:580-OKI78SR5/1.5W36C - $3.93
Datasheet for OKI-78SR
http://www.murata-ps.com/data/power/oki-78sr.pdf
3digit meter - fcb_electronics (ebay) - $14.99
Female USB jack - ~$1
Acrylic plastic (Tap Plastics) - ~$2
SPDT switch - ~$1
music is by Positively Dark- http://www.entropymusic.com
kick ass!
njllllljon 9 months ago 3
I need 1 of those
mmyr123 10 months ago 4