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I'm a complete newb when it comes to the over-sized calculator. I'm also having trouble doing something rather simple - anyone here able to help out at all?

I'm working on a high current project here. Its essentially a constant current supply which will be fully adjustable from 160 mA - 54 Amps, at voltages from .5V up to 5.5V. It can be configured for driving purely resistive loads, delivering up to 250W through a .1 Ohm resistor, or can be...

Hey guys. I need to make a PSU. I'll be driving a small impedance load (<100 mOhm) from a power source constrained at ~19VDC (Laptop PSU) to a fully adjustable current source. The ability to switch to constant voltage mode would be very good as well. Anyone here know of a any good SMPS...

Ok. So. I've got an internship lined up for the summer. I'll be doing embedded systems programming/prototyping for Vishay R&D. But here's the deal: I've got to be applying for part time work again in the Fall. The research project at LANE was put on hold, so now I'm back to revising my resume...

My sister sent me this the other day. Having thought I knew lots about Nikolas Tesla, I went ahead and read it. Its very amusing and informative, I hope you guys enjoy it! From the folks at the oatmeal, Why Nikola Tesla was the greatest geek who ever lived - The Oatmeal

Alright guys, I know some of you couldn't care less about what a spectrometer can do for you, but I found this kickstarter project which aims to sell $35 DIY spectrometer kits. Its webcam based and also supported by a community and the software developers themselves. While I think the setup...

If you take a glass of extra virgin olive oil and "pump" the solution with a 405nm laser, you will see some red fluorescence in the form of a red beam through the container. Pumping with a 532nm beam yields an orange beam. From what I understand, this is similar to how ordinary organic dyes...

So I got the chance to take some horrible cell phone pictures of a couple of the systems at work. We have a OPO (pulsed) laser which has been out of commission for quite a while now, so we were disassembling it. We had to remove all the loose optics and power/water lines that are a part of it...

So, this one is a 2006 Ophir head paired to an Ophir LPM. 3W max I believe. It got around 4 years of service and hasn't been touched for 2 years or so, and you can see why. The paint has been cleanly ablated off by our YAG, and the sensor portion has many-a craters drilled in. They tell me it...

No, I'm not racist. I was wondering how they say they that living things emit IR bits of the spectrum, and how to determine which wavelengths and how much of it. If you could stand a person in the focal point of a large aluminum parabolic reflector, should you be able to direct all the emitted...

Here's an amazing deal on ebay. 3 available. $295 OBO 473nm Blue DPSS Laser System - LaserGlow Technologies LRS-0473-KFM-00150-10 | eBay Yeah. Its that good.

Why? Bags of leaves

Shipping within the US or CA only. All items will be individually packed and shipped with the service chosen by the buyer. USPS and UPS services are available. For Sale: 542.7nm HeNe tube with 12VDC PSU included. Ballast is built into the enclosed tube. The tube has an aperture shutter and...

Time to get some good discussion going again. So how about it? In only 4-5 sentences, state the definition of science as you understand it. No wiki- google- or webster quoting. Use your own definition in about 5 sentences or less. Here's mine: Science; 1. A research institution similar to...

I'm considering adding some food coloring to the water supply to be circulated through my tube. Any reason why this would be unhealthy for the tube? ..or me?

or possibly YVO4... anyways, its on ebay for $99, but shipping is the only real expense. Its untested because of it power requirements. This probably up there with the laserscope when it comes to the possible number of things on this device that can kill you or seriously maim you if not your...

I've been thinking about this for a while, and now its just bothering me. Why is it that a beam is brighter when the beam propagates towards you, than when you stand behind the source? I ask because, I though that brightness would be a function of the number of particles in the air that...

Its about that time when a man must pass on un-completed projects to make room, and to get higher prioritized projects rolling. A 445nm module, complete with Flexdrive V5 set to ~813mA IIRC, connections made with silicone wire, and collimated with an aiXis AR coated lens, all assembled within a...

I finally got my Cree XML T6 emitter based flashlight from DX. I can make a 2 inch spot of light on the back of my hand from 2 feet away and feel heat on the surface of my skin. And I thought focused beams of light were that much better at transferring energy... turns out that incoherent white...

Used Omnichrome 74s. More than 10 available. Price jumps back up after today, but its still a nice price! Omnichrome Series 74 HeCd Helium Cadmium Laser | eBay Ooh... also found a Coherent Sapphire SS 488 at 60mw. $399...