Re: Competition #1 - Best Laser under $100
685nm pen in a refurbished WL E2 ... You have no idea the challenges here. Since we're limited to 3 shots, I tried getting of of the module (most irritating part), the host, and the best beamshot I could get of a 20mW 685nm laser with a little smoke. I tried...
This was hard because I couldn't just use the case pen, these diodes are case neutral with only TWO pins. Got a little advice from Jay here to just find a way to get contact with a wire for the negative. So I took a long~ish length of black wire, stripped most of it, then sandwiched it between a module cover and the module itself, and screwed it on there. Then in the crevice left over, I wrapped it a couple times. This wrap, and the extra, got jammed TIGHTLY between the module and the pen shell/host. This thing isn't going anywhere. This also double for the issue of the module being a hair too narrow, and sliding through the host. All in all, after all the irritation, it's a decent pen in a wonderful host! Also, 685nm isn't used too often.
Part:
Host: DOA WL E2 host ($40 shipped)
Diode: 685nm diode (3 for $10 on ebay)
Driver: ghost drive V2 ($7)
Module: 5.6mm copper from GB, ($4)
Lens: 635-650 3 element ($6)
TOTAL: $67