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Hi! This forum has been extremely helpful to me in the past, and I am hoping I can get a little more benefit from all of your collective experiences. I have recently become interested in electromagnetic fields generated by electromagnets. I have not, however, had any luck at all figuring out...

Ok, this is an idiotic question... But I have to ask it. I have seen people shining lasers into devices which split the main beam into many smaller beams, casting a grid pattern onto a surface. I would really like on, but a half an hour of googling has not been succesfull at finding out what...

Hey guys! I'm back. I need this to be short so here we go: My friend has set up a wind-turbine to power his house off-the-grid style, and he wants to set up an alarm to tell him when the voltage goes to 12.6/12.7 . He would like to to be variable (a simple potentiometer would suffice) and he...

Ok, so I have a reputation in my familly for knowing everything about lasers. I dont know everything about lasers. I know almost nothing. But I do understand most of the jargon, so when someone sais a 30mW 532nm handheld in a pressfit heatsink, I know what it means. So of course I must know...

Hey guys! So, before we begin, a little background! I was recently inspired for reasons we will not go into here to build an infrared vision set. There was a thread open in this very forum earlier (as expected, no one could help, but it was worth a try). What I came up with is pretty simple: I...

Hey guys! I'm back. Its been a few months since the last time you guys showed me how little I know, educated me, put me in my place, and ultimately helped me achieve my optical hopes and dreams. Think you can do it again? As you can guess from the title, I am looking for help with some DIY...

Ok, so I am a big flight sumulator fan, but I have never had a "real" flight simulator, only the simplified kids versions. I just decided I wanted a real one. So I got falcon 4.0 and apropriate joysticks, thrusters, and pedals. It is epicaly awsome. The only real problem is... well... my laptop...

Ok, so someone probably already did this, but I couldnt find the thread for it. Sorry! That said, heres the question: Could I put 4 diodes through one lense to make a more powerfull laser? If I can, would I wire them in parallel to one driver, with the same power suply, or do I need a drive...

Ok, so I need to step up a 12vdc battery until it can charge a capacitor to somewhere in the 100-200 vdc range. Anything come to mind? Thanks, Liam.

Hey guys! So I am not saying this is possible, but is there anything you can think of that would creat a powerfull enough flash to mark paper as a good distance? Say, 50'? I want to build something out of, say, a capacitor bank, power suply, and whatever else you guys suggest, that could be used...

I live on a lake. There is a rowing team wich practices every night. I was out tonight shining a 1w 445nm handheld in two directions: straight up, and straight down. I was on my roof. The rowing team went by, and one of them shouted "holy ___ dude, look at that laser!" to which his friend...

Ok, so I have no idea what I am talking about. No, seriously, I have no idea. I would like to make a handheld pulse laser. I have a 42mm x 3.5mm neodymium ruby laser rod. I also have a xnenon flash tube from a canon camera. Thats it. I have no knowledge, no skills, no experience (aside from a...

Hey guys! I am working on my first blue build. I have one of these: 18V 5W Cree Circuit Board for Flashlights (16.8mm*5.5mm) - Free Shipping - DealExtreme I would like to know how to test this driver to make sure that my diode isnt going to die in a flash of light. Thanks guys!

I just spent a little over a month PMing with Eudai twice a day about my second build. He wrote pages and pages of advice, help, and explanations. He walked me through the entire process from "where do I begin" to "how does it work" to "where do I get the peices". He ended by giving me a great...

So, I am currently designing a 445nm handheld, and I want to know... What kind of heatsink do I need? How big does it have to be? What should it look like? Should it be finned, ridged, grooved, or smooth? Should it be made with two-part of one part? Single metal, or multiple? Ok, now that you...

Ok, so this may be a totaly newb question... But Im totaly newb at lasering, so Im sure you will all excuse it. My question is simple. I send electrons from my battery into my driver, which regulates and passes the electrons through a timer, and then sends them forward to my driver. And then...

Ok, so I recently build my first laser, relying entirely on this forum and its members for step by step instructions all the way from the very beginning. Soooo cool. Totaly epic, in fact. But I would now like to make a bigger one. (isnt that how it allways works?) So what it the most powerful...

Ok, so I just completed my first build, and no matter how I adjust the laser housing, I never seem to be able to make a spot which is smaller then 3 inches at 10 feet without a red glow around the point. There seems to be a "ideal focal range" where the bright point and the lighter ring are the...

I often see, when exploring this site waiting for my diode to arrive, comments like "4mW 42nm yellow" or, in the advertizement that just apeared, 200mW 499nm" I have a rought idea, but nothing specific. Could someone please clarify what these two numbers are, what the abreviation next to them...

Ok, that didnt work, sory about that, unfortunately I cant delete threads, even if I made them. Could someone please explain how to upload photos and then delete this thread? Again, realy sory.