Geekaroni Labs Blog

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Topic by joespicnictables 


How to get +7 volts from computer power supply? Answered

I have used modded computer power supplies many times to power my creations, but in the past I have always relied on just using either the +5V red wires, the orange +3.3V or the +12V yellow wires.  However, most sites that offer advice on diy lab power supplies always say to hook the 12V to the 5V to get the 7V.  My question I guess is do I hook the +12V to the +5V to be the new +7V positive, and then rely on one of the black ground wires to be the negative? Or, is it the +12v  wire hooked up to my 7V devices positive lead and the +5V wire hooked to the devices negative lead?  Any help would be great, kind of stumped.  Multimeter was lent to a friend, and I'm not really in the mood to fry electronics to test it.  Thanks and sorry for the oddly worded question, having trouble following myself at this point.

Question by iminthebathroom   |  last reply


Casimir Effect Outside a Lab

Does anybody know how to go about recreating the Casimir effect outside a lab? Say I have a vacuum chamber and two copper plates. I want to create the Casimir effect within the vacuum chamber, Only problem is that to do so, from my understanding, I'd have to have the copper plates within nanometers of each other, I've heard of methods using oscillating crystals...can anyone help me?

Question by ted_gress   |  last reply


Homemade power supply problems

I am trying to build a variable power supply using a LM317 variable voltage regulator. When connected to no load, i can get a sweep from 1 volt to 15 volts. but when a load (small pager motor, laser diode) is connected, i can only get up to 4 volts, and about 12 milliamps of current. Help!

Question by wii552   |  last reply


Need to decorate middle-school computer lab - cool ideas?

Brand new computer lab & I would like to "geek it out" with some cool stuff (like the CD wreath & little component "bugs").

Question by mrsdi   |  last reply


Experiments with large capacitors, what can be done with those big "car audio" capacitors? (1.2 Farad size.)

If you were a "mad" science teacher, what experiments would you show your classroom of students? We're looking for a WOW! factor here, something memorable. Parameters for this experiment include (1) large capacitor such as a 1.2 Farad capacitor, and cheap or easily found parts to demonstrate experiments. Trying to avoid items that cost much or require lots of time and effort. (Building a Tesla coil would be an example of something that takes too much time or work.) Thanks Instructables community!

Question by DIY-Guy   |  last reply


How to make a lab vacuum chamber

I have just buit this vacuum bell jar system form several sizes and with electrical inputs: http://www.youtube.com/watch?v=O91eCB_GvwY

Topic by bubal   |  last reply


Can I use a antec power supply to make a lab power supply like the atx ones? Answered

I have an antec power supply and wont to make a lab power supply like the ones made with atx

Question by redlizard5   |  last reply


Squid Labs Tour with Christy, Corwin, and Eric

Here's an old video I found starring Corwin, Christy and me talking about some of the stuff we did at Squid Labs. It was filmed in 2004 and early 2005 - we don't mention Instructables, because we hadn't started it yet! Hope you enjoy: When you're done here, check out this one starring Tim.

Topic by ewilhelm   |  last reply


Combining PSU rails for lab power supply? Answered

I recently received 2 old computers from friends for tinkering purposes. I'd like to take their PSUs and create a power supply for projects. However, they only have max outputs of 110W. So, I have a few questions: 1.) Is it possible to combine rails? 2.) Is it safe? 3.) What kind of power increase would I be seeing? Please try to answer all 3 individually.

Question by General Eggs   |  last reply


how do i replace LED's in my electronics lab? Answered

I own a Matronix 500 in one electronic lab. I was experimenting on my own and I accidentally overloaded the LED's and broke them. can someone tell me how to replace them? 

Question by coleyy   |  last reply


PCB fab lab questions? (and nixie tubes?) Answered

Now that I have a new oscilloscope (rigol DS1054Z), and have learned a LOT about programming and electronics while down at NASA langley for a research program (semi-intern), I feel like I should start working on a real project (other than my quadcopter), and was thinking about making a nixie tube clock. I would like to make it from scratch of my own design as I feel one learned the most about electronics by not using other's designs. However, I do not have the resources or time to bother trying to etch my own PCB. I attempted that before and was not able to get usable results. What kind of costs am I looking at if I locate a relatively local company for the job? I hate calling people and companies, but I suppose that is still the most practical way to figure out what I need to do and place an order, I don't know. Economies of scale is a great thing, makes things in bulk production cheap! However, would the costs of ordering one or 2 PCBs be non-economical and/or non-practical? Should I consider many smaller projects and stuff to be created on a breakout board? I hate messy, sloppy protoboard, it is just nasty, though easy for non-high-density boards. however, I would love to hear the opinions of others for these things. When dealing with nixie tubes, are sockets for the 1N-14 avalible? A lot of the new old stocks seem to have very thin and long legs, almost as if they are meant for through hole soldering directly onto a PCB like capacitors and resistors. I would prefer a socketed tube to make replacing them quicker and easier. 

Question by -max-   |  last reply


Can you use a pc power supply for a lab power supply but still use your pc? Answered

I want to make one of the lab power supplies from a pc power supply but still want to be able to use the pc. Is the possible or will i have to scrap the pc?

Question by redlizard5   |  last reply


Is it possible to wire computer PSU's in series to achieve a higher voltage? If so, how can it be done?

I want to make bench top PSU's out of old computer power supplies and I want a 24v output as well as the typical outputs, but I don't want to put a transformer on it that could only handle so much current (I might want to run some bigger motors off it)

Question by The Ideanator   |  last reply


what would this HeNe laser be used for? Answered

A friend gave me a Melles Griot 05-LLR-811-249 he had lying around his house. It's a 1mW 632.8nm red Helium Neon laser. Full specs can be seen at: http://users.df.uba.ar/padulo/archives/0.5%20-%201mW%20self%20contained%20He-Ne%20(red).pdf What would it be used for? What cool things could do with it?

Question by Morgantao   |  last reply



how to avoid lump formation due to carbonates in lab slab cultured marble samples.?

When we make lab samples, small lumps are formed which is difficult to break in the mixtures. This on pressing gives spots of carbonate specks which looks very odd and damages the beauty of the samples.

Question by ashok -1955   |  last reply


Computer PSU wire question? Answered

Hi all, I want to turn an old computer PSU into a lab bench PSU.  After cutting all the connectors at the end of the cables, I've noticed that some of the common (black) wires were made of copper, while some of them were made of nickel \ aluminum (Silverish). The same is true for the +5V (red) cables. It's not the first PSU I noticed that had the different materials, and I was wondering: 1) Why are there two different kinds of wire? 2) Is it OK to ignore the wire material and just splice all the blacks together, and all the reds together? Thanks!

Question by Morgantao   |  last reply


Intro to MITERS

Here's a nice introductory video for MITERS, the MIT club that Eric, Tim Anderson, and the Squid Labs team used as their clubhouse/home base for building awesome things while at MIT.  Looks like people are still learning new things, and making good use of the tools and shop space.

Topic by canida   |  last reply


Here're some primers for basic techniques in the machine workshop.

I've posted this link elsewhere on 'ibbles, I make no apology for that, just spreadin' the knowledge :-)Covers the basics of workshop practice courtesy of MIT robotics lab. It's quite dry, but I bet these guys really let go at the weekend.Robot delivery roomEnjoy!

Topic by bosherston 


PSU converted to Lab supply shuts down when anything bigger then a fan is connected? Answered

have converted PSU over and it runs small fans just fine but i try to connect anything larger and it shuts off. how do i figurer out what is causing this to happen? more: it is a 200w computer PSU trying to power a moblie ham radio max draw 6 amps

Question by srainsdon   |  last reply


How can I dress up as a space scientist?

I am doing a careers project for school. I am researching being a space scientist. As a part of my presentation, I have to dress up as my career. My only idea is wearing a shirt from the science fair with a rocket on it and a lab coat, but I am not sure whether or not space scientists wear lab coats. Any ideas would be very much appreciated!

Question by cupcake811   |  last reply


9v battery simulation?

I want to use a lab power supply to run simple ohm's law experiments instead of using a 9v alkaline battery. One of the experiments uses a resister in series with an LED to show the effects of how a resister limits current. I can set my lab power supply to 9V but I don't know what current to set it to in order to be the equivalent of the 9V battery. Can anybody enlighten me please? I'm just getting into learning electronics.

Question by woodyd   |  last reply


on a 185w max computer atx, what would be the best resitor to use? (for lab power) Answered

I have a 185w max output computer atx, i have wired it up and followed directions. but im not sure of what resitor to use. also when i plug it up it comes on, but then when i put a load on it (like red to black) it shuts down and i have to reset. still works, just need to know what im not doing right

Question by jshpps   |  last reply


Help Making Tattoo Lab Power Supply Jumper / Converter + pic

This is what I'm talking about. can you see it?  it's the first thing that comes up on google image search when you type in "lab supply jumper." It's so you can plug in a tattoo machine and foot pedal into a lab power supply.  theoretically I get how it's working.  The foot pedal is what interrupts the circut.  when you press the pedal down, it makes contact and completes the circuit.  So, the machine needs to be routed through the pedal before getting power from the power supply (versus plugging the machine directly into the PS itself.  Cause then you'd have to turn the PS on and off to get the machine to work or turn off). So, I'm assuming that's why there is a cord going from the "machine" 1/4 terminal to the "foot pedal" 1/4 term, right?  Then the pos and neg banana plugs go into the power supply. specifically, my question is this:  do I have to solder to make this?  or can I just twist wires together?  and can I buy everything I need from radio shack, right?  I'm pretty confident I can do it either way, just need a diagram or something on how to wire everything. I'm also asking my brother who was an electrician before getting injured on the job- he's on disability now but may be able to help, too. =) It's gotta be easy to make, right?!?!  so help me do eeettt!!!  =0) thanks for any and all help!  Sarah ps- I attached a pic of the power supply I have so you can see it as well. and for the record, my tattoo machine is RCA not clipcoard, but goes to a 1/4 male mono all the same.  As well as my pedal. k, thanks. ;0)

Topic by crumpitt   |  last reply


Robots working together to serve up cold drinks

Behold, the future of robotics! No, not Skynet, but a couple of robots diligently working to bring someone a cold beverage from the fridge. The big robot doing the work here is "Alan" and was made by Bosch Research and Technology Center. Nice stuff if you won a fancy lab, but Bosch also developed its own PR2 Remote Lab so anyone from around the world could develop for robots and test the results. Bosch Researchers Work to Bring Robotics Into Tomorrow’s Home

Topic by fungus amungus 


fi5e - How to Enter the Ghetto Matrix (DIY Bullet Time) - Universal Laser Cutter Finalist!

To see who won the VersaLaser, read the announcement here.fi5e was a finalist in the 2008 Instructables and Universal Laser Cutter Contest for:How to Enter the Ghetto Matrix (DIY Bullet Time)Should this project win the grand prize VersaLaser laser cutter package from Universal Laser worth over $15,000? Help us judge the contest by rating this forum post! Audience votes will count for 20% of the total. Check out all the finalists, and vote for your favorites!This is a forum post created by the Instructables staff on behalf of the finalist. This laser cutter would be put to good and plenty use by all artists and collaborators involved with both the Grafftit Research Lab and Free Art & Technology Lab. We could really use this to help get our new open source lab off the ground. Help bring a Laser Cutter to Brooklyn! Thanks to everyone for checking out the project, and double thanks to those that cast a vote for the Ghetto Matrix.

Topic by fi5e   |  last reply


What's the best procedure for making salicylic acid? Answered

Is it possible to make salicylic acid from aspirin using pretty common household gear?  If not, what would be the procedure for deriving it from willow? and what kind of willow to use?  Would it be more cost effective to buy crystalline salicylic acid?  Bonus Question:  What ppm would be good for using it as a facial cleanser and an anti-dandruff shampoo? or rather, what ppm would be bad? If it matters, I've done a year of chemistry and a year of organic chemistry with labs.  I sucked at the classes but rocked the labs like KISS at an assisted-living activity day.  

Question by AngryRedhead   |  last reply


Butane distillation

I have instructions for extracting pure esential oil from plant material using butane. The problem I have with it is that at the end, the butane is vented. I just don't feel right about venting unburned hydrocarbons into the atmosphere. I've been looking at glass lab equipment (distillation tubes, connectors, etc). I have no background in chemistry, but it seems to me it shouldn't be too difficult to put something together using standard glass lab equipment to capture, distill and reuse the butane. Butane boils at 31 degrees farinhite and is heavier than air. At the end of the process, the oil is scraped from the bottom of a drying dish. Does anyone have any suggestions on how to put something like this together? Thanks

Question by GlobalVillageIdiot   |  last reply


How can I find the pinout for my flyback transformer?

I have already looked at the lab hv-ps page and cannot find the pinout for my flyback transformer. Can anyone help me?

Question by immune2u   |  last reply


Instructables in Trendwatching

Instructables was mentioned by Trendwatching in their September 2006 Status Skills article.Here's a quick selection of sites helping the masses acquire a bewildering array of skills:Instructables is a project by Squid Labs, who create a lot of stuff for business and pleasure, and have now documented their how-tos for all to see and use.More news articles about Instructables here.

Topic by ewilhelm   |  last reply


Graffiti artists replicate The Matrix on Instructables.com--and win $15,000 Universal Laser Cutter!

Instructables and Universal Laser are happy to announce that the incredibly creative Instructable, How to Enter the Ghetto Matrix (DIY Bullet Time) has won the Grand Prize in the 2008 Instructables.com and Universal Laser Cutter Contest: a 40-watt VersaLaser laser cutter valued at over $15,000!Grand Prize Winner How to Enter the Ghetto Matrix (DIY Bullet Time) How to Enter the Ghetto Matrix (DIY Bullet Time) provides an extremely detailed Instructables tutorial on how to build a cheap, portable special-effects rig to create "bullet-time" animations--a technique, popularized in The Matrix movies, where the audience's point-of-view moves around the scene at normal speed while the action on screen is slowed down."We want to inspire great ideas and provide skills, tools, and shared know-how," Instructables CEO Eric Wilhelm explained. "This project represents exactly what we're trying to achieve with Instructables."The DIY Bullet Time Instructable was created and documented by the Graffiti Research Lab, an open-source urban art and communication collective supported by the Free Art & Technology Lab, a Brooklyn-based non-profit research lab creating work at the intersection of popular culture and the public domain."This will be the cornerstone of our new lab space," said GRL member fi5e. "A whole crew of creative people are really excited to put this thing to use! Thanks for helping us bring the VersaLaser to Brooklyn."The winner was chosen by votes from Instructables users and our panel of expert judges, who reviewed the 14 finalists drawn from a pool of over 600 entries. Congratulations to fi5e and everyone at the GRL - we know you'll really put the VersaLaser to work, and can't wait to see what great things you make! First Prize(in alphabetical order) Autonomous Foosball Table Blu-Ray Laser Phaser! Build a Greenland Kayak Build a Wind Harp! Build yourself a portable home - a mongolian yurt Extreme Business Cards Giant Fresnel Lens Deathray How I built a carbon bike frame at home (and a bamboo frame too) How to Make a TRON Style Lamp: The MADYLIGHT How to build a sit down driving arcade cabinet Laser cutter, start slicing stuff for under 50 dollars Laser Image Projector The Spiral Data Tato -- A Curiously Complex Origami CD Case Second Prize The authors of these Instructables win a robot t-shirt and a laser-etched plaque. Listed in alphabetical order. 30 minute USB microscope The Ambience Enhancer Autonomous, Wirelessly Controlled Hovercraft Conductive Glue And Conductive Thread: Make an LED Display and Fabric Circuit That Rolls Up. Cool Wave Ring Dollar Store Parabolic Mic Handcut inlay A Home Power Plant - Wind Power Generator Revised How to Make a Color-Changing Lighted Faux Fur Scarf How to make a pair of Angel Wings How to Make an OAWR (Obstacle Avoiding Walking Robot) Make DIY Vanilla Extract "Quicksilver" Retro-Future Scooter from appliances and scrap metal Solid Wood Digital Clock The Stirling Engine, absorb energy from candles, coffee, and more! Squishy Breast Stress Relief Toy TiggerBot II Robot Tube Amp Rebuild (and Mod) U-Disp - The Digg (tm) display (Open Source)Wooden Gear Clock Expert JudgesTo help us judge, we assembled an amazing team of expert designers, engineers, hackers, journalists, scientists, technologists, and other really smart people. They spent hours examining each of the finalists Instructables and helping us make a decision. We'd like to send a huge "Thank You" to each of our incredible judges. We couldn't have done it without you.Violet Blue (author, blogger, podcaster, columnist, and SRL vet)Gareth Branwyn (Contributing Editor, MAKE Magazine)Zoz Brooks (Host, of the upcoming TV Show Prototype This)Joe Brown (Editor, Wired Magazine)Colin Bulthaup (CTO of Potenco, co-founder Squid Labs) David Calkins (Co-founder of RoboGames) Julia Cosgrove (Deputy Editor, ReadyMade Magazine)Chris Csikszentmihalyi (Professor at the MIT Media Lab, Computing Culture Group)Simone Davalos (Co-founder of RoboGames) Lenore Edman (Evil Mad Scientist Laboratories)Dan Goldwater (Founder of monkeylectric, co-founder Squid Labs)Saul Griffith (President of Makani Power, co-founder Squid Labs, MacArthur Fellow)Duncan Haberly (Instructables)Matthew Hancher (NASA Researcher in the Intelligent Systems Division)Brian Lam (Editor, Gizmodo)Ed Lewis (Instructables)Jeffrey McGrew (Designer, Because We Can)Chuck Messer (Tackle Design, The Open Prosthetics Project, host of Discovery's Smash Lab)Megan Miller (Editor, PopSci)Jim Newton (Founder of TechShop)Quinn Norton (Journalist)Windell Oskay (Evil Mad Scientist Laboratories)David Pescovitz (BoingBoing, Institute for the Future, MAKE Magazine)Cloude Porteus (Instructables)Randy Sarafan (Instructables, Eyebeam Resident)Peter Semmelhack (Founder of Buglabs)Tyghe Trimble (News Editor, Discover Magazine)Noah Weinstein (Instructables)Eric Wilhelm (CEO of Instructables, co-founder Squid Labs)Dan Woods (Associate Publisher, MAKE Magazine) For the full information on how the winners were chosen, click here.

Topic by ewilhelm   |  last reply


Saul Griffith awarded a MacArthur grant!

Saul Griffith from Squid Labs, Howtoons, Instructables, and other cool companies has been awarded the MacArthur "genius" grant. He gets $500k because he's so genius-y and it couldn't be going to a better guy. Saul Griffith is an inventor whose innovations span industrial design, technology, and science education. Through a variety of endeavors at MIT and as a principal in Squid Labs, Griffith demonstrates his boundless energy for inventing across diverse disciplines in the global public interest. While still a graduate student at MIT, he designed a unique membrane-based molding system that can produce a variety of common lenses from a single pair of flexible molding surfaces. This prototype has the potential to change the economics of corrective lenses in rural and underserved communities around the world and continues to be a major focus of research and development energy at Squid Labs. At MIT, Griffith co-founded Thinkcycle.org, a web community that has produced socially conscious engineering solutions, such as novel household water-treatment systems. Thinkcycle.org is the forerunner of Instructables.com, a remarkable do-it-yourself website driven by user contributions. He is also a creative force behind HowToons, an animated educational resource designed to engage children in hands-on science and engineering projects. Through the spin-off company Potenco, Griffith initiated the project design for a hand-held human-powered generator, which has the potential significantly to improve access to electronic devices such as laptops and water purifiers throughout the world. Though still quite young, he holds several patents in optics, textiles, and nanotechnology. In these engineering ventures as well as others yet to be imagined, Griffith is a prodigy of invention in service of the world community. Saul Griffith received a B.MET.E. (1997) from the University of New South Wales in Sydney, Australia, an M.E. (2000) from the University of Sydney, and an M.S. (2001) and Ph.D. (2004) from the Massachusetts Institute of Technology. He is a co-founding partner of Squid Labs and serves as a technical advisor at Potenco in Alameda, California. full story

Topic by fungus amungus   |  last reply


Transistor? Answered

I am constructing the flyback driver found on the power labs website and cant get a 2N3055 transistor quite yet. I do, however, have a bag of transistors i pulled out of CRT monitors. I was wondering if one would be a good substitute for the 2N3055 for driving a new flyback, the number is C4916, the base-collector voltage is 1500 V and the Collector current is 7 Amp

Question by budhaztm   |  last reply


Where is borosilicate glass tubing (or similar) available to be purchased?

For me, ordering online is a last resort, so I was wondering if anyone knew of any brick-and-mortar stores that carried something like that. Also, the woman who runs the chemistry dept storeroom at my university is a singularly unpleasant lady who won't even give students new equipment unless the lab professor insists.

Question by zalf 


Mozilla wants its users to help re design Firefox

The article pretty much explains it. "The Mozilla Labs, which acts as the idea wing for the organization behind Firefox, is expanding its call for open-source contributions to those outside its base of community-minded coders and techies. Now, they want to get designers and creative types in on the deal."

Topic by Ferrite   |  last reply


raspberry pi digital dimmer of light bulb

Hai, iam working on dimmer light project with raspberry pi the module which iam using from research design lab issues with the device to test or run it. please any one can suggest me can i change the module to wifi based dimmer module to test or run the light dimmer. thank u

Topic by james2jain 


Turning on an old Psu

Hey there, I got this old PSU, a Delta DPS-350EB-3 from an HP NetServer. I'm trying to make a lab power supply out of it, i just can't get it to power on. There's a blue wire bundled with a ground that when shorted will power the psu for a second then shut it back off.  I tried to put a load on the 5v & 12v with no success. Anyone got an idea? Thanks

Topic by wbzial   |  last reply


I recently received my rotary encoder led ring from sparkfun, but I'm having trouble programming it.

I'm using an Arduino Uno. I found example code but it involves using a rotary encoder for input, which I don't have and don't intend on buying. Does anyone know how to program it to simply turn all the led's?

Question by midknight5000   |  last reply


would this IR sound transmitter work probably ? Answered

HI i was looking for an easy and good circuit to transmit sound over IR i searched using Google and found some circuits the first one http://www.electronicsforu.com/electronicsforu/lab/ad.asp?url=/efylinux/circuit/feb2003/aug99_IRcordless.pdf&title;=Infrared%20Cordless%20Headphone i found it on many sites and they say that it's working but the problem is that i can't find some essential parts in the stores where i live (the transformer ,bd140 or sk100) the second one http://www.electronicsforu.com/electronicsforu/lab/ad.asp?url=/EFYLinux/circuit/January2007/CI-01_Jan07.pdf&title;=IR%20Music%20Transmitter%20and%20Receiver is very easy and i have all the parts except for The UM66 which i think can be replaced with a 555 astable circuit to produce some sound but i want to know if it's possible to replace the UM66 with some sound source (TV , Mp3 player ,PC sound card output) ? if you have a tested circuit please post it here PS my local store http://www.ram.com.eg

Question by aessam1   |  last reply


aluminum powder is conduct electricity??? Answered

 Dear All...  Please help me to know aluminum powder is conduct electricity ???  Because I have bough ALUMINUM metal POWDER  99.7% Lab Chemical 425 mesh µ35 on EBAY. for making conduct electricity paste But when measured with my digital meter at 20 meg ohm  with 1mm distant I don't see  any resistant .Thank you in advance for your time.                                                                Best regards                 HAPPY NEW YEAR  

Question by lam   |  last reply


Using an electric shock to trigger an arduino. (doorknob variety)

I was thinking a transistor, how does one make ~20000v at 5mA useful. Do I use a capacitor or a coil of some type? Do I NEED an amp? Will it be jittery? I was even looking at those alfoil leaf static detectors and imagining some sort of field detecting reed switch.. ? Think frankenstiens lab: lightning=reaction :)

Question by oliverkellow   |  last reply


200 kl/day waste water from dye industry treatement by electrolysis No of plates electrodes & dc power requirement

I TOOK SAMPLE AT LAB LEVEL FOUND THAT THERE IS VERY GOOD FLOCCULATION OF DYES IN WASTE WATER TREATEMENT BY ELECTROLYSIS AT 24 V DC 3.4 AMP WHAT ARE THE STEPS FOR THE SCALE UP OF THIS TO REACH TREATEMENT OF 200 KL/DAY WASTE WATER PLEASE HELP TO RESOLVE ISSUE IN THE DEVELOPE CONTRY LIKE INDIA ETC

Topic by pcshah   |  last reply


Game test thing

@echo off :menu cls echo Welcome to Martin's Zombie Survival Test! echo Are you ready to begin? echo 1) Yes! echo 2) No! set /p letter= if %letter% == 1 close if %letter% == 2 close cls :startgame echo Question 1. echo A flu has just infeccted your city and it was turning people into zombies, what would you do to stop yourself from being infected? echo 1) Hide in your cupboard echo 2) Get a injection from the doctor echo 3) or start to research your own cure in your private lab set /p letter= if %letter% == 1 goto menu if %letter% == 2 goto menu if %letter% == 3 goto lvl2 :lvl2 cls echo Question 2. echo You are mixing chemicals together when all of a sudden a zombie breaks into your lab, what would you do? echo 1) Throw the chemicals over it. echo 2) Pull out your gun and shoot it echo 3) or stab it with your scalpel set /p letter= if %letter% == 1 goto menu if %letter% == 2 goto menu if %letter% == 3 goto lvl3 :lvl3 cls

Topic by JMTS 


24v power supply out of computer psus?

So i watched a video a while ago, it was about turning a psu into a lab bench psu. The guy said you can run 2 of them together making 24v, having to cut the (earth)ground on one of them and have them running to the same outlet. So i can have the 24v but what about 3.3v and the 5v? im not really sure how those would work, wouldnt they just stay at their normal voltage levels?

Question by knexsuperbuilderfreak   |  last reply


Little help with a part.

OK I dissembled a WWII radar for its gold, silver and parts. I got these Bradley Labs #SE6M82H parts they are 4 inches long and ½ inch in diameter, I may just melt for the silver but before I do I would like to make sure what they are first. I think they are 25,000 to 50,000 volt rectifiers but I can’t get a datasheet or any other information on them. So can anyone help me with information on this part? Joe

Question by Josehf Murchison   |  last reply


Hello all friends , I wanna make a DSSC , i need to make TiO2 as Semiconductor ,from which sources can i make it?.

I have a research to make Dye-Sensitized Solar Cell-DSSC and i should make every materials by myself in Lab. how can i make TiO2 and from which sources ? to be more cheap and easy . and what is an alternative material for Iodide ( electrolyte ) in DSSC? thank you for replying and for sharing your knowledge about. :) 

Question by Omid1985 


Has anyone seen the Pleo Robot yet? I got this link in my email today... Or Project NAO ?

Pleo is a robot toy modeled after a dinosaur believed to have lived during the late Jurassic period. The toy is manufactured by Ugobe Labs, a company based in Emeryville, California that specializes in the design and manufacture of lifelike robots. Pleo is intended for use by adults and children nine years of age or older. ...Pleo is equipped with numerous sensors and servos. This is from a techtarget report: Pleo - robot

Topic by Goodhart   |  last reply


Arduino Guitar Effects Pedal?

Ive been wanting to do this for some time, but my technical abilities are somewhat lacking, especially in the programming side of things.  Could somebody please join these two projects together for me? http://blog.makezine.com/archive/2009/08/collins-lab-guitar-pedal-modding-wi.html and https://www.instructables.com/id/Lo-fi-Arduino-Guitar-Pedal/ I know this is unpaid work, but you're a kind bunch :-)  P.S. I just realised that this does seem to be a lot of work - two different sets of hardware does complicates things somewhat :-/

Question by DELETED_zoltzerino 


Help developing a Kodacolor-X roll of film?

I have a roll of Kodacolor-X Color Negative film, and I know that they won't develop this in a normal lab with the rest of the C-41 rolls, so I need some help. All the information on the roll is read as: Process C-22 Kodacolor - X DAYLIGHT OR BLUE FLASH CX 135-20 ASA 80 - 20 DIN 20 EXPOSURES 24 x 36mm Does anyone know a way or a place I can get this process C-22 developed? Please let me know. Thanks!

Topic by GorillazMiko   |  last reply