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LED solar light

 
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Mondo
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PostPosted: Fri Mar 24, 2006 12:02 am    Post subject: LED solar light Reply with quote

Check this light out:
http://forums.linear1.org/index.php/topic,660.0.html

"It uses plastic soda bottles, 3 AA niMH batteries and a 6 volts/ 200 ma solar charger. I am using a total of 10 LEDs. One led is for the flashlight mode, and 9 are for the Lantern mode. By simply twisting the top off, the flashlight turns into a reading light. The strap makes it convenient to walk with it and keep hands free. In order to keep things simple, the circuit uses only one limiting resistor for the one led. The other nine are connected straight to the battery, without limiting resistors. Since the 3 batteries provide a voltage varying from 3.3 to 4.2, I desided that the circuit resistance, including the battery's are good enough. I broke the rule of not using limiting resistors simply because I assumed that under normal usage, the leds will never be subjected to peak voltage past 4.2 and a current. greater than 35ma These LEDs appear to work fine well past 35ma of current."
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