Help needed in building a white LED cicuitry - Electronic Circuits Projects Diagrams Free

losT · 26th September 2003, 07:06 AM

Hi,
I need some help in building the above circuit. The major problem is I couldn't find a white LED which is at least 40 cd and 60°C in angle. Therefore I need to use array of LEDs. How do I connect the array of LEDs with a switch which can control the light intensity?? I will be good if someone could show me the schematic. Pls help.

tansis · 26th September 2003, 11:45 PM

The best schematic for a LED flashlight that I've seen so far was published by
www.elektor-electronics.co.uk
in the november 2002 edition.Sadly I am not allowed to upload the article due to copyright restrictions. You could try asking them for a copy though.

What I can say though,

Some of best LEDS you can buy are made by a company called Nichia (japan) ref NSPW 500BS [6400mCd!]

Maxim make a couple of ic's for driving leds
http://dbserv.maxim-ic.com/appnotes....ber/1804/ln/en
http://dbserv.maxim-ic.com/appnotes....ber/1750/ln/en

You may also want to take a look at battery chargers for Lithium-ion cells as they are very suitable for this application.

Build your own solar cells
http://www.solideas.com/solrcell/english.html

http://www.e-f-w.com/community/index.php
http://www.e-f-w.com/community/modul...article&sid=10
http://www.sentman.com/led/durabeam.php
http://www.solorb.com/elect/solarcirc/solarfl/

http://dbserv.maxim-ic.com/appnotes....mber/913/ln/en
http://dbserv.maxim-ic.com/appnotes....mber/897/ln/en
:idea:

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26th September 2003, 07:06 AM	(permalink)
losT	Help needed in building a white LED cicuitry Hi, I need some help in building the above circuit. The major problem is I couldn't find a white LED which is at least 40 cd and 60°C in angle. Therefore I need to use array of LEDs. How do I connect the array of LEDs with a switch which can control the light intensity?? I will be good if someone could show me the schematic. Pls help.

26th September 2003, 11:45 PM	(permalink)
tansis	The best schematic for a LED flashlight that I've seen so far was published by www.elektor-electronics.co.uk in the november 2002 edition.Sadly I am not allowed to upload the article due to copyright restrictions. You could try asking them for a copy though. What I can say though, Some of best LEDS you can buy are made by a company called Nichia (japan) ref NSPW 500BS [6400mCd!] Maxim make a couple of ic's for driving leds http://dbserv.maxim-ic.com/appnotes....ber/1804/ln/en http://dbserv.maxim-ic.com/appnotes....ber/1750/ln/en You may also want to take a look at battery chargers for Lithium-ion cells as they are very suitable for this application. Build your own solar cells http://www.solideas.com/solrcell/english.html http://www.e-f-w.com/community/index.php http://www.e-f-w.com/community/modul...article&sid=10 http://www.sentman.com/led/durabeam.php http://www.solorb.com/elect/solarcirc/solarfl/ http://dbserv.maxim-ic.com/appnotes....mber/913/ln/en http://dbserv.maxim-ic.com/appnotes....mber/897/ln/en :idea: