hi i wish to wire 6 (or x number) of the same led, using a psu - 12v line. Most probaly it will be an orange led, thought i should say that as i've read that the actual colour will effect the resistors ..is that so ? So simply whats the best way .... ?
find out the Vforward and Iforward for the LEDs you are going to use
(12 - x * Vf) R = ------------- If
--
John MexIT: http://johnbokma.com/mexit/
personal page: http://johnbokma.com/
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thanks.....one thing though could you elaberate on Vforward and Iforward ((If Vf)?!
Put them all end-to-end (in series) and put a 1k resistor in series too. That should light them up with 3.6mA. If you want them brighter, use a lower value resistor, but too low will cause them to fail. The lowest you probably want to go is 220 ohms.
-- Regards, Bob Monsen
Those values are given in a datasheet. Vf is different for LEDs with different colours. If is often around 20 mA, but look it up.
E.g.
Vf = 1.7 If = 20 mA
( 12 - 6 * 1.7 ) / 0.02 A = 90 Ohm.
So use a 100 Ohm resistor in this case.
--
John MexIT: http://johnbokma.com/mexit/
personal page: http://johnbokma.com/
Experienced programmer available: http://castleamber.com/
Happy Customers: http://castleamber.com/testimonials.html
Hence: look up Vf and If, and *calculate*
--
John MexIT: http://johnbokma.com/mexit/
personal page: http://johnbokma.com/
Experienced programmer available: http://castleamber.com/
Happy Customers: http://castleamber.com/testimonials.html
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