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I wanted to dust off my engineering skills and build my own LPM. Something simple with a pre-calibrated Ophir head and voltmeter. So really, all I built was a power supply. The supply runs off a single 9v battery. That is fed to a 7805 to provide stable power to the volt meter and to a DC-DC...

Thanks for the idea about the batteries. I hadn't thought of those. I'll check them the next time it craps out.

After lurking and reading for quite some time I finally got around to my first build. I'm using a 9mm diode from DTR and a 2.1a x-drive coupled to a host from Survival Laser with two 3.7v LiPo batteries. Everything here is "off the shelf" as I don't have a machine shop handy. The result is...

I've been lurking on this forum for a while now and thought it time to come out of the shadows. I've always had a fascination with lasers. In high school I tried to build my own argon laser from scratch (even the tube). It glowed purple for a brief few seconds, but that's it. I own a 5mw...