20100407_SolarElectronicProject2
A solar-powered night light I made recently. It uses:
(a) The Joule Thief circuit from here:
www.evilmadscientist.com/article.php/joulethief
(b) A Super Capacitor (100 Farads !)
(c) A flexible solar cell (ebay)
(d) A PNP transistor to hold the joule thief off, while light is falling on the solar cell.
I built part of the circuit in "free space", as it was reasonably simple. The joule thief is on strip-board because I had made that a while ago just to see how well it works independently.
20100407_SolarElectronicProject2
A solar-powered night light I made recently. It uses:
(a) The Joule Thief circuit from here:
www.evilmadscientist.com/article.php/joulethief
(b) A Super Capacitor (100 Farads !)
(c) A flexible solar cell (ebay)
(d) A PNP transistor to hold the joule thief off, while light is falling on the solar cell.
I built part of the circuit in "free space", as it was reasonably simple. The joule thief is on strip-board because I had made that a while ago just to see how well it works independently.