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good to hear someone already has one and it's usable:) bought this one and another cheapo one, shipping doesnt combine, but both came to under $3. not bad to 2 crappy lights :beer:

Warske must have found the 3.13 constant empirically. If you had a laser of known power measured with another LPM, then you'd just have to adjust the temp value to suit your needs. I dont know if his method scaled linearly, but i suspect it's only true for values in a close range to what he...

got the package yesterday:) heatsinks look great! thanx Matt :gj:

here is what i'll be reading: http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=slod006b :)

does the gain (20/200) relate to output current? i also have L7800 series regulators in TO-220 form, from the datasheet it says 1.5A. the LM386 datasheet doesnt mention output current, and the L7800 one doesnt mention gain...

HIMNL9, you only said to heatsink the MOSFET, but what about the OP-AMP itself? i will try this with an LM386, not sure if it's a good or bad choice of chip for this application, but i already have a bunch laying around:)

learning about drivers myself and this was good info:)

please add periods to the end of your sentences. it will help everyone understand what you are actually trying to say:) sounds to me like your question is "if you make a laser from parts you found for $86, will anyone here buy it from you?" list the parts with links, otherwise people who know...

Re: FS: 5 heat sinks for $25 :takeit:

Re: FS: Few things. Very Cheap! hey, for #7, do you mean the outside doesnt have grooves at all for the o-rings?

does the tube have space for 2x CR plus a driver of some sort?

hmm, you must be right about air cooling. so in addition we'd have to calculate power of the heat lost due to conduction with the surrounding air. this might be doable, we know the temp of the air, it's the same as the starting temp of the target. i'll crack open a physics textbook and see...

hmm, damn, i was really hoping i'd be right about all that:) thanx for another data point!

It should be possible to calculate all of this theoretically, but it would be difficult. The main jewel of this tutorial is the 3.13 magic number, I'd call it the Warske constant or Kw:) With this value he's letting us bypass all the complicated stuff and get straight to the point - relating a...

that auction is done now, but the seller has a green for 6.58...

ah, so PWM if not bad per se, it's that the widely available PWM drivers dont have the most stable output. and #3, of course, now that you said it, makes perfect sense:)

can you tell if it's PWM or Buck/Boost? I am trying to figure out why there arent more people using flashlight drivers for lasers. so far i've read a few posts here and there, looks like this question is starting to get asked... i dont know if this has been covered in the past, and the...

any #3's yet? :)

Re: New Stock of Overspec 5mW Green mine has an extremely bright dot, the beam is visible under office lights and at dusk. when mine DOES dim, it's like the one in your video. 80% of the time I can simply hold it on for 10-30 seconds and it gains full brightness, after that it turns on to...

Re: New Stock of Overspec 5mW Green i got mine yesterday! slight dimming problem, BRIGHT->diiiiim->brigHTENS. once on for 10s it seems to "warm up" and starts at BRIGHT right away. less dimming with fresh AAA's. this is probably not as useful as a light meter reading, but i did measure the...