Solar garden LED light and single NiCd AA charger
Another Reverse engineered circuit diagram of a mass produced solar LED light. This light also automatically turns on when there is no light falling upon the solar cell but this circuit waits untill it gets bit darker outside than the one above. Although battery charging is through a schottky diode, some charging efficiency is lost in the 330 ohm resistor during daylight time.
Original source: http://members.shaw.ca/novotill/SolarGardenLight/index.htm
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Solar Cell charges a NiCd AA cell when darkness falls
Reverse engineered circuit diagram of a popular mass produced solar light. The light automatically turns on when there is no light falling upon the solar cell, so the parts count is minimal. The charging circiut is not particularly efficient since the battery must charge through a plain diode.
Read more original source:http://members.shaw.ca/novotill/SolarGardenLight/index.htm
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USB Powered AA NiMH – NiCd Battery Charger by LM393
The charger in this project is designed to charge two AA NiMH or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1.5 hours, 1500mAh NiMHs in about 3.5 hours, and 2500mAh NiMHs in about 5.5 hours. The charger incorporates an automatic charge cut-off circuit based on cell temperature, and the cells can be left in the charger indefinitely after cut-off.
Source:http://www.stefanv.com/electronics/usb_charger.html
http://electronics-diy.com/
Thank you.
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