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You're right; it's a simplification to make the equation easier to write. I (battery) = V2/R The equation could also be: Ri = (V1/V2 - 1)*R thank you! Interesting about the LiFePo! suggests that a 1W+ 445 could run from a single A123 sized cell host!

yes, that is a buck converter (mentioned above)

the color of the beam (and thus the apparent brightness) is mostly affected by the diode itself and not the current (1A vs 1.5A). Another factor that can affect the color is letting the diode get hot. But all you need for that is poor heatsinking. CD, if you set both to the same current, the...

glad you solved that one! :) thanks for posting the resolution.

Hi, you should measure the internal resistance of the battery you are using: http://laserpointerforums.com/f67/how-healthy-your-batteries-how-measure-internal-resistance-57576.html It needs to be 'excellent'. But if I were you I'd only set it for at most 1.1A because you don't gain much more...

Glad you noticed. The reason I said 5 not 4 1 ohm 1W resistors is because their power rating could be exceeded with a fresh good li-ion battery with just 4. It likely wouldn't cause a problem, but it would be a flaw in the recommendation.

you're over-volting the output of the flexdrive. at 1A those 6 diodes are 0.77V each and your 1 ohm load is 1V so that's 5.62V. Take 2 diodes out to get to 4V.

No, you can't bypass the potentiometer when the driver is at the max range. The best thing you can do is just take it off (at least the + diode leg) and re-set with a dummy load, place a dab of hotglue to keep it if you're afraid of bumping it again.

One of the things you can do to improve efficiency in high current builds like this with the microboost is to solder two one-ohm resistors in parallel with the large range resistor, turn the potentiometer all the way down, and re-set the current to 1A with a dummy load. This will relieve the...

Exactly right, this and also 18650 s with bad internal resistance may have trouble supplying very high current 445nm diodes. This is the main reason I thought now would be a good time to post this. Thank you for the condition chart!

You know a BGA has reflowed when you see it evenly drop down 200 microns and heat for an additional 10 seconds :) jib77, I appreciate it that so far you have been taking your own path to development and aren't trying to copy my designs. Years ago when I released the first switching laser driver...

Blord, with that resistor you are pulling about 2.4 amps from the battery during test which can be stressful for it. However it looks like it worked ok for you.

It's worth a try. I can't see anything physically wrong so far..

can you post a pic of the top also? The first thing I notice is that it's covered in flux, but other than that it looks ok.

gillza, please do not request or do this, it is confidential info. However there are lots of instructions here for the OP if he wants to DIY a driver. Since he's into DIY, he should not try to copy a driver, but understand one and the 'DDL' lm317 based one is a good start.

I've seen here and there posts about people having trouble with their batteries, some from DX (I've had issues, too) and other places, so now's a good time to post a simple test you can do to find the health of your rechargeable battery. For an example I'll use a common 18650 li-ion cell. When...

Hi David Todeschini, there is some misinformation in your post that needs correction, and I will get to that, but first, after reading your post and strange claims I had to google who the heck you were. :) Luckily enough, it looks like others have taken care of the search already and I...

If you are in the states, I now have the RIYA Lites available for $150, if you're interested, send me a PM.

I saw some misinformation in this thread that needed some correction, so just a quick note: In this case, you are incorrect. The microboost will regulate the current as long as the battery voltage is equal to or less than the diode voltage. This means that yes it's OK to use with a red diode...

then you're on a slightly different range. have a look at the manual for range details.