Search results

Dark, actually it can be done, if you have just the right diameter & thickness metal tubing. The tubing goes either all the way around the diode can; or just exactly sits on the shoulder at the tip. DanQ

forgot to add explanation: both of those 2 methods I just posted about will work if you have a dmm with very low impedance... but most dmms only have very low impedance on the amp scales, which aren't as useful in careful calibration of milliwatt diodes.

Yes, of course that measures current - but not the current that the LD will draw. Your latter point is better, but still won't measure the diode current very accurately. There's this thing called "insertion loss", and a dmm set on milliamp ranges very likely has an impedance that will change...

Thanks Morgan -- yeah, it's hard to say some things without sounding mean; but like you said, following some of the advice could ruin diodes for someone who can't afford a lot of re-try's. I'd rather be the meanie who made someone think about what they say, than the meanie who made someone blow...

No, that doesn't measure the current! That would be measuring the voltage across the diode, which is not linearly related to the current. Actually only one current-measuring method posted in this whole thread will work: measuring the voltage across a 1-ohm resistor that is in series with the...

yeah, too mini I guess... not very efficient. I'd better mount a sanding disc on my table saw, and spin that while I use the drill to spin the work :D DanQ

way cool Jay... looks very professional. now if I only had some $$$ :cryyy: now then, lessee... got some cheap Al tubing that may fit... maybe I can find a washer that fits around that... chuck it into my drill to 'turn' it down with sandpaper... :cryyy: DanQ

this looks like a good opportunity for someone to start in with surface-mount, to buy the whole lot.... any thoughts on price? I don't personally need them - too many already - but having them all separated and marked is really a nice feature ;-) DanQ

:huh: just curious - what are you guys doing with all that mercury? anyone with children should not even have it in the house hopefully you know the hazards... in case you don't: mercury is not a toy! Along with its high toxicity in minute amounts, -it is absorbed through your skin...

I sent you a pm - requesting your Paypal addr to send $$ - now I see that maybe you didn't get it... well, pm me with that info please EDIT 5/27: made contact - info received - payment sent. DanQ

some patience would be useful... or at least more patient language. Putting this together takes more time and energy than you can imagine; and is very expensive to get going. Kenom, like most people, has a life... I believe he's still a student. Both time and funds are short in that occupation...

quick note: rechargeable Li is 3.7 - 4V, might do the trick. Or, just measure the current it draws at 4.5V; then replace the driver board with one that will deliver that current from whatever battery you want. Personally, I favor 18650's - they pack a hefty charge ;-)

At the very least you'll need to know how much current your module requires. IF it has a current-regulating driver attached, then you can use "Ohm's Law" to calculate things: E = I x R or R = E / I or I = E / R where E is Volts, I is Amps, R is ohms (those are the letters I learned it by...

Re: Laser Barrels V2. GB. Second run. Kryton Groov Dave, do you mean that aluminum part that's about 17mm od x 10mm id x 5mm thick? I could use one of those, if Ken doesn't want. (and Ken, if you have access to more I'd buy some). I could trade you, ummm... 1,000 10.5ohm size 0805 sm resistors...

Looks great! interesting host... much nicer than my first (which somebody dubbed a 'pvc pipe bomb') ::) and welcome! :-) DanQ

Re: 405nm AR glass lenses - fit AixiZ  FEELER how's this?

hey, I just remembered that the PIC was only used for the PC interface - all you need for the meter portion is an op-amp and a cheap digital panel meter (plus the circuit board and parts that were already listed). You don't need the PC interface to do measurements, only to do the fancy graphing...

Re: 405nm AR glass lenses - fit AixiZ  FEELER wel, shoot -- I wish I had money, then I'd buy more. What I really want is to have lots of money! Then I could buy all of them, or maybe I'll buy the lens factory, then I'll give them all to Igor for free! ;) ;D ;D ;D DanQ

But it's only 35 pages... geeze, what are you going to do when you get to a 60-pager? ;-) ;D DanQ

iirc, everything except the program for the PIC would be easily reproducible from what's been posted...  :-?