Recent content by andythemechanic

I can proof that a cat has nine tails: - no cat has eight tails - one cat has one tail more than no cat --> it follows that one cat has eight plus one = nine tails ;D ;D ;D

Re: Danger from IR leakage from lasers vs IR heate You're right it's a bit simplified. It takes not into account spatial coherence of the different sources but only is a geometrical model, assuming a point-like light bulb. It catches only the fact that from the laser more Energy hits the eye...

Re: Danger from IR leakage from lasers vs IR heate

Re: Danger from IR leakage from lasers vs IR heate Hi, I tried to visualize a bit whats the difference between a ligh bulb and a laser. No photons involved, just geometry ;) . Its the fact that a laser emits all its radiation in one direction that makes it so dangerous.

Yes, the keyword here is "cheap" . If the price will drop below 100$ for a blue diode this would be nice even if it's only 10mW.

Yeah, I don't expect them to be in the 100mW's. Maybe more around 20mW or so. Would still be very nice to have "real" blue diodes, not only blurays. Another thing is that this projectors containt a tiny microfabricated scanner mirror assembly. Thats also a "want have" for me. Add: I looked a...

New projectors will work with laserdiodes and soon be in every mobile etc. Heres a link to a preliminary spec sheet: http://www.microvision.com/pdfs/pek_specs.pdf This projector uses 442nm Diodes! This will be the times when they get as cheap as the blurays :P

Thanks, it gives nice beamshots also :D Here is one attached

Thanks! The rods are really cheap, arround 10 Euro for half a meter with diameter 25mm. Some time ago a bought a box of alu rods of all sizes for some ten euros ebay, watch out for something like this. You can get enough material for a hundred heatsinks really cheap.

I measured it to be 110mW at 120mA Current. Actually I am not sure the diode will survive this very long ::) These diode is not the PHR or 6x diode which can be bought here in the forum, I got it from somebody at the alt.lasers newsgroup. I still have not measured its current-power curve.

Wow nice! I like these ones a lot. Wish you happy fluorescense hunting! Try to get some uranium glass marbles these are really nice. You can see one in the first photo here: http://www.laserpointerforums.com/forums/YaBB.pl?num=1231091031 Andreas

Right, but you have to waste a lot of energy (12V-V_diode)*I_diode This would be the easiest way to drive the diodes, and should work well when the power supply is well regulated. The voltage of the supply should be as close to the diode voltage as possible, to use mall resistors and keep...

Problem is that with 5V or 3.3V you can use no linear regulator anymore because the standard ones have around 2V dropout. But a computer switchmode supply should be regulated very well, so the extra voltage regulation is not needed. When you want extra security maybe you can use an additional...

hapyman, du you need modulation? if not you can leave out the mosfet in this circuit and also its driving (all what is left of the 10uF capacitor ) and the 1n4007's Then this circuit reduces just to a set of current limiting resistors for each diode, the easiest way to drive them, but no active...

This gonna be a really big box then. For 400 diodes that would be at least 40 power supplies. I know from high power diodes that the preffered connection is all in series. Here is an example: http://www.roithner-laser.at/htoe/AS081Q.html The AQ081Q15000 has 150 Bars in series and is operated at...