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It held steady at 444mA. Perhaps a poor connection from the host to the driver would be enough for my DMM to buzz continuity but not enough for significant current. And since my 12V supply was clamped on to both the V- ring and the contact on the other side, it may have circumvented that...

Yep, I've tried it in and out of the host to no avail. I think I'll have to buy a new one. Out of curiosity: is there any significance to the fact that it only whines when hooked up to the batteries but not the 12v PS?

The batteries drop to 7.88V together which could potentially make it difficult to power a Vf over 6.63, (Vin*.85, from the data sheet) but even when I lower my test load to a Vf more like a red LD I still get no voltage across my 1 Ohm resistor. I wish I had a bench power supply.

I haven't measured the voltage while powering the soon-to-be laser, but I just calculated the Ri of the spiderfire batteries and the AW batteries I've used in my 445. They were 227mOhm and 127mOhm, respectively. I can't find the driver but its from ricktrent and is similar to this one BTW...

Nope, I wouldn't dare after what I've read here. I'm using Spider fire from DX, which may not be top-of-the-line but they power my higher current M140 just fine, so I'm betting they are adequate. Am I right in assuming the high pitch tone is from the MOSFET?

I'm putting together a 405 SO6J with 2 16340 Li Ions supplying the power and a blitzbuck v3.1 regulating the current to 445mA, but there's a problem. I put everything in my host except for the diode, leaving the leads hanging out the front so I could set the current. When I clicked the switch...

I should have done this a while ago. 61462

Hard to say for sure. Well above body temp and enough for me to be worried about the life of the diodes. I was off when I said 700mA, that's the current I would have preferred. This is the driver I used, which had enough voltage for all of the Vfs of the LEDs combined. If one were so...

10600nm doesn't pass through many materials well; that's why you need special optics to handle the beam. It's absorbed by polycarb, glass, your corneas...If you can get rid of the sodium emission and some of the carbon of the carbon emission it should help. but you already know that if you do...

Just keep it away from your eyes and your beer. "With a threshold of around 4 parts-per-trillion in beer, 3-MBT is among the most potent flavor compounds that can be found in beer; as such, it does not take much to ruin your beer. If you drink your beer from a pint glass on a sunny patio you may...

I wanted to give my herbs (real herbs...for eating) an early start this spring without paying a ton for a commercial grow light, so I built one. On a sheet of aluminum (9x12x.125" or 22.5x30x.3cm) I glued 23 three-watt LEDs with thermal epoxy. The LEDs' wavelengths were chosen to...

I didn't have time to try it in our actual fluorimiter but I tried it in a "spectrovis plus" by Vernier which has a 405nm and 500nm excitation source. I saw only a small peak with the 500 but with the 405 I got a nice one (see attatched). That peak is right at 650nm.

That's really cool, I noticed some green when my 405 was diffused through the bottom of the bottle (PET). I think I'll take my lasers and some oil to work tomorrow and hook them up to our new portable UV/Vis. I'll tell you how it goes, though it's the first day of classes so I might be busy.

After two months of waiting, I finally recieved the host I ordered for my 445 build. Here it is. There's just one problem: I can't get the bezel/head off to get the the pill and such. I've tried brut force (two strap wrenches to try to twist it) and it's currently soaking in acetone in case...

I stumbled upon this old laser safety video and thought it was worth sharing. Lasers were in their infancy but they had long-developed safety protocalls, and LSD inspired music. The Link

Though I haven't put much thought into developing a method, I have access to a few spectrometers. An Agilent UV/Vis with a tungsten deuterium source and photodiode array detector good for 300-800nm. A Thermo FT-IR which I don't know the wavelength (or wavenumber) range offhand. Probably the...

I suspect it was something like this http://http://www.bausch.com/en/Our-Products/Eye-Vitamins/Vitamins-for-Eyes/Ocuvite-Lutein They are often prescribed to slow the progression of agre-related macular degeneration (wet especially), cataracts and degenerative retinal diseases. I tend to err...

I have this suspicion that for most laser eyewear, the profit margins are huge. I also have a theory about why retailers can get away with it. I'm a chemist and have tossed dozens of polycarbonate glasses over the years becuase they cost about a dollar each. Having worked at an optometrist's...

Is there a resource for matching a dvd-rw diode to the burner from which it came? I'm building my first burning laser, including the driver. As a chemist, I dont really know what I'm doing so Ill probably fail but at least I'll learn something. And once that happens, a way to match the pre...