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Interesting circuit. I think I have all the parts lying around, will try to build it some time. Thanks for sharing :) (its a pity 9V batteries are so expensive here :()

I actually have that game on my phone too, it was pretty fun :)

Thanks for posting this, it will come in very useful to THE NOT-YET MEMBERS :)

Glad (and relieved) that it went well :)

I thought I had heard that question very recently. lol :P

No. Welders helmets do not work as laser safety glasses.

I'm glad this should finally turn out well with Reginak :angel: What a long wait! :yh: Btw, has this sort of thing been done by vets before? (leaving the forums when in debt) or similar?

Just build one. You'll have no regrets :angel:

I assumed he meant the brightness of certain wavelengths to the eye. I think that's what he's talking about so I think you're right.

Getting injured by a 300mW laser is theoretically not as bad as getting burnt by a 1W. I shouldn't have used the term safer, it is rather ambiguous in this case as eye damage would be instant. :thinking:

Just add a large heatsink and it should be fine. Adding a fan is also a good idea, which should turn out great. In my build (http://laserpointerforums.com/f50/my-first-build-red-lab-laser-250mw-dvd-burner-80410.html) I added a heatsink and fan (read the update at the bottom of the page) and it...

Green is far brighter to the eye, and theoretically "safer" when it comes to eye damage or injuries. EDIT: for eye injuries, both cause instant eye damage so one isn't really safer than the other.

I attached a fan to the heatsink of the laser housing, it was actually getting rather warm after a few hours' use. It is attached straight to the 12V power input jack, and is always on irrelevant if the laser power switch is on or off. The fan now keeps it very cool, so cool that the heatsink is...

What sort of form factor are you looking for? A labby or portable build?. I have a few ideas and could design one.

Thanks for the TEC advice. I am thinking of this one sold at dealextreme (yes, they sell TECs!): TEC12706AJ Thermoelectric Cooler Cooling Plate - White - Free Shipping - DealExtreme. It is 40x40mm so rather small, and runs at 12V 6A. No word on the amount of junctions, although it states "-...

Wow ARG, Thanks for this project! I am planning on a LPM build, I have the microcontrollers, LCD and all the miscellaneous parts lying around. All I need is the TEC and I'll give it a shot :)

The 200mW Laser should work fine for stargazing and similar activities. Looking at the beam in the sky is perfectly fine with this output power, and it should be very visible in the sky. Safety glasses would not be necessary as the viewers are not looking at a dot or reflection of the dot on a...

Ouch Blord, Hope you get better soon :angel: Having a broken foot must suck in not being to easily move around.

Wow those are very nice lasers. The 'big' one has one of the biggest heatsinks I've seen on a handheld, and it looks pretty cool!

I would be very interested to see the results of these. The price is an absolute steal per unit, although if you actually consider companies buying thousands of these at a time, it seems plausible.