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How many GGG LEDs can I wire together when connected to the PC's 5V power?

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Neverending Project:


--- Quote from: unclet on January 31, 2008, 09:39:23 pm ---I am assuming you know Randy's resistors are 100 ohms?   I mean I have no idea, but I will take your word for it.   

--- End quote ---
Actually, no. I don't know this. This picture is from the afore mentioned calculator (wizard?), and it calculates the resistor size based on the number of LEDs and their current draw. Considering Randy states that it includes an "appropriate resistor for a 5V connection", I would assume it is correct. But if it isn't, and he cannot substitute for the 100 Ohms, they are very easy to find and readily available most everywhere resistors are sold.

Good luck!

urbecrisch:

unclet, please post your results.  I'm thinking of doing the same thing with my PC.

Fozzy The Bear:


--- Quote from: urbecrisch on January 31, 2008, 11:33:00 pm ---unclet, please post your results.  I'm thinking of doing the same thing with my PC.

--- End quote ---

Don't worry!! Just go ahead and follow the information supplied there by "neverending project" It is correct......

As for the resistors supplied by Randy with the LED's don't worry! They're fine in this application and are exactly matched to the current draw of the LED's that Randy supplies! Just go ahead and use them.

Best Regards,
Julian (Fozzy The Bear)

unclet:

urbecrisch
When the project is done there will be pictures of everything

Fozzy
Excellent .... thanks

Zebidee:

When wiring many LEDs together, you may be better doing it in series, and running it from the PC's 12v rail.  This should result in less stress on the 5v rail and less heat buildup.  Each LED subtracts it's forward voltage from the line, so 12v could easily power 3 x 3.5v LEDs (= 10.5v) running in series behind a single resistor (rather than one per LED).  If you want more than 3 LEDs, then wire another set of them + resistor, in parallel with the first set.  Each set of LEDs in wired in series, but each set in parallel with each other.

If you want just one or two LEDs, then powering from 5v is fine.



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