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OK, so I've been playing with my lasers for a while, and burning stuff got old pretty quickly (and the wife doesn't appreciate the stink and the scorch marks around the room either). So I want to try some interesting experiments with lasers, and one of the things that always fascinated me is...

Hello all, I've been experimenting with a M140 build (SF501B, 1.55W output). It's designed to run with 2x 18350 cells. It gets quite warm almost immediately, so I tested the current flow, and I got this: with a total voltage of 8.12 Volts (4.06 for each cell), there are 1.2 amperes flowing into...

Hi all, I obtained a few days ago a very cheap, Chinese charger. I didn't like the cheap-ish look of it, so I measured the voltage and current supplied, and I found out that it was nowhere near the needed values/procedures for a Lipo cell. It actually overcharged the cells to over 4.56V. I...

Hello, I just received today two pairs of Uvex S1933X goggles. I tried them with a few cheap China pointers. As expected, red isn't blocked at all. Then I tried 532 green... This is a grossly overspec pointer. I don't have a LPM but I wouldn't be surprised if it's around 80-100 mW. The dot...

Hi, I just wanted to show you a photo of an optical group I removed from a CD/DVD reader (or burner). I have no idea where it comes from, because I removed it years ago, and the original reader has long been thrown away. I think it's interesting: it's fairly big, all metal, and has a lot of...

Hello LPF, I just joined your community and I'm here to introduce myself. I'm 37 years old (as you might notice from my username :) ) and I live in Italy. English is not my language, I'll try to write correctly but please forgive my mistakes! :) I've always been really fascinated by the natural...