Which circuit do you use


Newly Enlightened
Dec 27, 2006
Hi Flashaddicts

I want to use currentregulation for my led lights from now on.

Which kind of circuit do you use for Cree XRE or Seoul P4 ?
Run on 800-1000 mA from 2 or 3 CR123 batteries or 3 D cells in bigger light.

I can solder SMD or standard.

Could you please help me by sending me your circuit diagram.
Whith all the names of the parts.

I think a thread which collects al the regulation ideas would be helpful for many, specially for beginners.

Thanx a lot.


Newly Enlightened
Oct 7, 2005
First as a new guy, realize you'll find you'll get a much better response if you search first- there already are comparisons and lots of which-converter questions.

Next, you're asking a lot by asking people to send you their circuits. Those who design them have a lot into their ideas, so you'll notice even their pictures will have components markings smudged.

Now, check out the sandwhich shoppe, and read the spec sheets for the converters:

Now, you need to pick which of those power supplies you will use. There is a reason so many converters exist, and which one I'll recommend will depend on a few things.
The 3D cell light--are you using alkaline, nimh, nicad, or lithium ion?
The 123 light--which are you using 2 or 3 cells? Are they CR123 primaries, 3.7v rechargables, or 3v rechargables?

For right now, I'll assume you're not using any rechargables, so 3D will be 4.5v / 2 CR123s will be 6v and 3 CR123s will be 9v.

For the 3D one, use the GD500 blank configured for 917 or 1000. The GD is a relatively new converter that will buck and boost but has voltage input requirements between 1.8 and 5.4. This will do very well on your light.

If you're using 2 or 3 CR123s, you can use Downboy 917 or 1000.

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