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  1. Hirudin

    LEDs wired in parallel, issues with different Vf?

    Yup, we were both right regarding the math. Both come out to a total of 1.54 A and 22.4 V. I wonder if one way is better than the other. Does your way require less resisters/LM317s? I think so... Yeah, that needs 4 instead of 7. Are there other advantages too?
  2. Hirudin

    LEDs wired in parallel, issues with different Vf?

    I think your spaces are disappearing because of the design of HTML. Multiple spaces are always converted to a single space in HTML. To make your chart look right you can wrap it in "code" tags, like this... Lets say these LEDs have a Vf of 3.5 and require 500 mA (+)--0--0--0--- |...
  3. Hirudin

    LEDs wired in parallel, issues with different Vf?

    I don't know which it would be called. What I was going for is 7 sets ("legs") of 4 parallel wired LEDs each. By my understanding to calculate the power requirements of LEDs wired in parallel you add the the currents together because all the LEDs get the same Voltage. For series LEDs they all...
  4. Hirudin

    LEDs wired in parallel, issues with different Vf?

    Thanks Mash! I'd skimmed through that already, but I'm so green with electronics that a lot of it was over my head. Maybe that chip (the LM317) will work for both regulating/evening each leg like I want AND keep the other legs protected should an LED fail as you want? I'll have to look harder at...
  5. Hirudin

    LEDs wired in parallel, issues with different Vf?

    Thanks greg_in_canada! I don't know much of anything about resisters, but I'll try not to be a typical newbie and go research them myself... These LEDs are going into a planned projector, so even/balanced brightness is important. So, what you're suggesting is to use the highest ohm resisters...
  6. Hirudin

    How to blow away an aspheric mag!

    I have to say, that first shot is one of the most incredible things I've ever seen! Nice job! Good luck with the R2, don't forget to show us pics!
  7. Hirudin

    Where to find clear plastic dome to protect Cree's?

    Surplus Shed has a couple. One's $4: http://www.surplusshed.com/pages/item/m2090.html The other's $17.50: http://www.surplusshed.com/pages/item/m2776.html They take PayPal and have a flat $5 shipping charge.
  8. Hirudin

    LEDs wired in parallel, issues with different Vf?

    I'm planning to build a large RGB array using Luxeon Rebels and the CCHIPO driver. Currently I'm planning to have 28 sets of LEDs. By the looks of it, the blue LEDs should be run at 385 mA, which will make their typical Vf 3.2. The CCHIPO driver has an output limit of 39 V and 45 W. So, if...
  9. Hirudin

    New Smallest 3W Raw Part 2

    Hmmm.. I think I'll wait 'til the second generation. PS cool knot!
  10. Hirudin

    New Smallest 3W Raw Part 2

    Wow! Cool light! exactly what I want, and more! Tiny, bright, mineral lens, rechargable battery, other stuff! Almost $100 for the whole set though... phew! I would like one, but I'm going to have to justify it to myself first. I've got a couple easy questions... Are there any more pictures of...

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