Activity Stream

Hello, Its been at least 3 years since I looked into using laser diodes to construct my home built projectors. Power output around 8-10W or more combined. Can anyone please tell me what is the best solution for RED, GREEN and BLUE diodes today. I hope there have been advancements in the...

Hello everyone - I'm still tinkering when I can. Just purchases some new scanners just to check them out and see how they perform. They require separate + and - signal inputs. My output is currently a +/- sinewave. Does someone have a circuit that concerts a sinwave to + and - signals? The...

It's the post-SELEM "crap, I should have brought this for the buy-sell-trade area" special... Selling: PT-40k galvos. "40k" might be a dramatic overstatement, but they do work (tested this morning). Mirrors need cleaning, power supply not included. Asking $50 OBO shipped within the US.

At the 2025 SELEM meeting earlier this month, a number of people were talking about the ILDA Digital Network standard. There were some good ideas and suggestions. The easiest way to bring those to the people working on IDN is to attend the monthly IDN Zoom meeting. Hosted by Matthias Frank...

I've been scrounging through my old stock piles of electronics "stuff" to see what might be reusable and repurposed. I disassembled this 180MB Seagate HD of mine, an oldie for sure, targeting the platter stepper. Here are some pics and wiring data. From my testing, this neat little motor ohms...

I need help determining if I need a laser show variance (I am in the US). I am just a hobbyist who wants to display laser graphics on the front of my house on Halloween. I like for my house to be a destination on Halloween, and I set up decorations, arcade games (free play), a laser show, and give...

Hey guys, I have been dabbling a bit into more of the esoteric wavelengths; 561nm, 570ish, 593nm. As it comes to dicrhos I'll be honest here, I haven't really checked any of mine to test with the 570nm module. I would like to add it to an RGB module. It would be great to just have the yellow...

Has anyone seen projectors by a company called LaserLighthouse? Didn't know of them, seem to be OK. Slide

I'm looking for a very specific file. Steve

Rodney (rodman1369) was unable to attend SELEM this year but suggested we start a Show Off thread of what when on. If you have pictures or just comments about SELEM 2025 please post them here. Here are a few of my experiences: When I sat down at my VR station one day mid way though SELEM I...

Walmart shrimp may have been exposed to radioactive material, FDA says Cesium 137... "Shrimp is the fruit of the sea. You can barbecue it, boil it, broil it, bake it, sauté it... there's uh, shrimp kebabs, shrimp creole, shrimp gumbo. Pan fried, deep fried, stir fried. There's pineapple...

Hi everyone, I’d like to briefly introduce myself. My background is in optical coatings – for many years I worked at an optics institute where I specialized in thin-film deposition for laser and optical components. After the institute was closed, I had the opportunity to acquire part of the...

It's been a while since I have posted any build projects. I thought I'd share some of the upgrade work that I have been doing in regards to my fogscreen. Of course, my fogscreen has been my most ambitious build and the one I'm the most proud of. Over the last few Halloweens, I have noticed how...