In 12 volts 3 ampere battery, how many 12 volts led can i use to light it up(not a strip one)
Topic by xandera
3/26/2008 is tech day at my school. There are going to be lots of exhibits of robots, etc. in the library. I was thinking about making some stuff for it, but I can't think of anything. Can you guys give me any ideas, and maybe a few links to Instructables? They all have to be cheap, since I am already working on two VERY expensive projects, and basically have $20 USD of spending money left.Thanks, and MAKE IT FAST!!!!!
Topic by YummyPancakes | last reply
Anyone else out there use/go to the Tech Shop in Menlo Park? I've taken 3 of their safty and basic usage classes for the lathe, mill and aluminum sand casting. I want to start making things, but I'm still a little unsure of myself. For a first project I want to make a vise. I found some plans that I want to scale down a little. I will need to either by or make a lead screw. I'll probably try to make one, its a learning experience, so what's the point otherwise? Anyone there have advise?
Topic by GlobalVillageIdiot | last reply
This thread will be dedicated to Tech-related poems, or poems of any sort... just tie it into something Instructables-related, somehow...Here's my work of art!Batteries...It seems as if I'm always waiting....waiting for the batteries to chargewaiting for the batteries to chargeand waiting for the batteries to charge again.It's too bad I'm never waiting for the batteries to die,there seems to be much less of that.-Josh Gordonson
Topic by T3h_Muffinator | last reply
Well in this group, we are all about technology that spies would use and things that would be considered "Spy Stuff". Anything made here doesn't have to be something spies actually use, it could be stuff that you think a spy would use. And please no cans on a string. Cool stuff like laser microphones, and stuff like that, most anything is accepted.
Topic by tonsofhoopla | last reply
Hello everybody, I was just wondering who would be interested in a tech shop/ space starting in Alberta, Canada. I live there and am looking to start a business possibly just looking for interest. It would include metalworking ie water jet and lathe work, woodworking ie table saw band saw and router, 3d printing and cad design team, laser cutting with its own team, teaching about coding and Arduino and micro controllers. If you are interested comment below. Also, anyone interested in funding a kick starter comment too :)
Topic by bhill12 | last reply
I love studying electronics and doing creative things with electricity. I was an artist/musician throughout all of my youth and decided to switch over to creative electronics after discovering the art of circuit bending. I want to get a degree involving creative applications of electricity, but I'm having trouble getting a clear picture of what the job market is going to be like after i graduate. I am wondering what creative positions are available, not just with Instructables but in general. Are there any particular companies that would be good to look into? I'm trying to plan my degree so that it will be appealing to the companies i want to work for. I was an artist before i was a tech/engineer so I'm particularily interested in things such as product design, creative tech projects, animatronics, sculpture and art/music installations. Any advice would be great, I'm eager to find a job that will require my creativity and that isn't mundane. Is creativity something that is reserved to be expressed in my spare time or can it exist within the job market as well?
Topic by Vaginatron | last reply
Hey everyone I know this is new technology that could be very promising but it needs help. http://www.kickstarter.com/projects/adapteva/parallella-a-supercomputer-for-everyone I am not affiliated with this project but I do believe in it. If I had any more money I would increase my pledge but that is beyond my means at this time. So, I'm coming to the community. Just check this product out and spread the word however you can. I personally believe that this could be useful for many applications where an arduino doesn't have enough processing power. Plus this device only requires 5 Watts under full load according to elementary test. And best of all it is set to release at less than $100. With the support of the community we can bring this product to market.
Topic by m9365428 | last reply
Hello, I'm following a circuit diagram for a current monitor that uses an op-amp as a differential amplifier. Connected to V- and V+ on the amp are the positive and negative leads of a 10mH Inductor that senses the current (as much as 9A) passing through an insulated positive line. The gain on the op amp, I'm told, is 220. If I calculated this correctly then at 9 amps in the insulated wire, 0.09V should be produced by the inductor and there upon entering the V+ lead and -0.09V in the V- lead for a differential of 0.18V which gets amplified to 39.6V. However the voltage source that powers the op amp is only 9V. So question # 1: Did I break down the math correctly? question #2: What happens to the excess voltage from the gain? I am getting all of my op amp information from wikipedia. I've never used an op amp successfully before.
Topic by watchingmachine | last reply
On the Instructables site the Tech Contest disappeared. Is it closed, or they won't announce finalist and winners? Or will appear when the winners have been announced? I entered in this contest and even if I'm not a winnner I would like to see the best projects. Thanks for your response!
Topic by Imetomi | last reply
Coffee tables can really bring a room together, especially if they're high-tech and provide their own entertainment. They're expensive, as the site suggests, but just the ideas warrant personal kudos. Of course, as with any coffee table, you'll need to have a coffee table book about coffee tables.Link via Neatorama
Topic by joshf | last reply
Daniel Schulze is an industrial design student in Berlin who is working on a sweet smoke machine. The plan is to have a 7x7 grid of holes that shoot little clouds of smoke into the air. The smoke comes from a fog machine and is shot up in the air with drivers. Check out the video below to see a test of one row. The full setup will be shown next week at DMY Berlin. A Modern Take on Smoke Signals: "For Those Who Can See" via engadget
Topic by fungus amungus | last reply
We're about to break out a new channel for assistive/adaptive tech projects, and other "disability hack" type of Instructables. The big question: what do we call this channel, and what category do we sort it under? Why is this a hard question? Check out the Humana Health by Design contest entries - they include everything from ultra low-tech tools and life hacks to construction projects and full-on techie builds. Perhaps we need more than one channel. If so, how should we divide the Instructables? Do we need one channel for high-tech projects, and one for low-tech? I've been playing with the ideas of "assistive tech" for the high-tech/gadget-based projects to be filed under Technology, and "adaptive tools" for the low-tech/reuse projects and life-hacks to be sorted under Living. These still seem to be arbitrary distinctions, and I'm not sure they make sense. What do you think? Please discuss in the comments, or feel free to send me your suggestions by email/PM!
Topic by canida | last reply
When I was young I idolized Jacques-Yves Cousteau, in part because of the undersea technology (aqualung, minisubs, habitations, etc.) but also since he was one of the first to warn of overfishing and open-ocean pollution. Do young people have technology heros today? (Linus T. and Bill G. come to mind, but I was hoping for someone more interesting...)
Topic by gmoon | last reply
Out in Naunquan, China the villagers use molten iron to celebrate instead of fireworks. The tradition dates back some 500 years when the blacksmiths of the day couldn't afford fireworks and did this instead. While there's only one color to work with, the effect is pretty stunning and a lot more in-your-face without, you know, melting your face off if you don't get too close.via Gizmodo
Topic by fungus amungus | last reply
I recently received the gift of a functioning VHS VCR, an older computer scanner, an old blackberry, an MP3 player with a broken screen (power still works), some motherboards, speakers, and a bunch of other tech. I plan on making insane art, but I wanted to know what practical notions for usage anyone here might have for such devices?
Question by stephensunday | last reply
I just got my new $30 Cen-Tech thermometer from Harbor Freight and it's begging to be hacked. I would love to be able to use this thermometer as part of a closed loop system to control a hot plate for soldering purposes. Just inside the battery compartment is a header with four pins. They nicely labeled the pins on the silk screen. I'm probing on "Gnd" and "Tx" pins. I used a MAX232 level shifter to convert the TTL output to RS232 so I could connect to my PC. I then ran the attached simply Python app that dumps the data packets to the console. Each packet has 25 characters and repeats at about 3Hz. My question is, how would one go about decoding the data packets? Some numbers seem constant while other move. I'm hoping the data format is obvious to someone. Note, the reading on the display was around 68.8 degrees F when this data was collected. The readings did jump plus/minus a few tenths while collecting. Any ideas? Thanks, Jim Console Output: 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 10 00 3A 07 9B 14 1B 1E 81 FF 15 07 A9 12 F6 01 CA 0B 97 0C 00 00 47 33 15 10 00 3A 07 9B 14 1B 1E 81 FF 15 07 A9 12 F6 01 CA 0B 97 0C 00 00 47 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 11 00 3A 07 9B 14 1B 1E 82 FF 15 07 A9 12 F7 01 CA 0B 97 0C 00 00 4A 33 15 12 00 3A 07 9B 14 1B 1E 84 FF 15 07 A9 12 F8 01 CA 0B 97 0C 00 00 4E 33 15 13 00 3A 07 9B 14 1B 1E 85 FF 15 07 A9 12 F9 01 CA 0B 97 0C 00 00 51 33 15 11 00 3A 07 8F 14 1B 1E 82 FF 15 07 9E 12 F7 01 CA 0B 9C 0C 00 00 38 33 15 11 00 3A 07 8F 14 1B 1E 82 FF 15 07 9E 12 F7 01 CA 0B 9C 0C 00 00 38 33 15 11 00 3A 07 8F 14 1B 1E 82 FF 15 07 9E 12 F7 01 CA 0B 9C 0C 00 00 38 33 15 09 00 51 07 63 17 65 1D 81 FF 2C 07 2D 15 F1 01 00 0C 92 0B 00 00 35 33 15 0B 00 51 07 63 17 65 1D 84 FF 2C 07 2D 15 F3 01 00 0C 92 0B 00 00 3C 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0A 00 51 07 63 17 65 1D 82 FF 2C 07 2D 15 F2 01 00 0C 92 0B 00 00 38 33 15 0B 00 51 07 63 17 65 1D 84 FF 2C 07 2D 15 F3 01 00 0C 92 0B 00 00 3C
Topic by jimk3038 | last reply
ok... i want a z shred but for a complete its like buying a real deck... i want to no if theres much of a difference with performance,because a tech deck is only 4$. btw z shred is made of wood check out the z shred site there pretty sick!!! zshred.com -M
Topic by GianniMora | last reply
I've recently started to build a tech deck skate park. The base is mdf (solid stuff, very heavy), and all the features will be made from wood with metal coping. The base is 36"x16" to fit on my desk. You can track my progress here: chrismccann.wordpress.com Let me know what you think, what you might change, and what you like/don't like. Also if you need any closeups of anything, I've got it saved in CAD and can post any screenshots you guys want. Also, here are a few questions I have for you guys: -The flat rails were easy because they were handles, but how could I make the rail on the stair set? -How should I cut the profiles (out of 1/2" plywood) that will be the shape of the quarter pipe? I need to accurately cut that radius, but I only have a crappy band saw, 1" belt sander, drill press, dremel, and various hand tools.
Topic by saturnv7890 | last reply
In this peashooter competition in the UK, some entrants have modified their basic tubes with some high-tech parts. This one uses a laser sight and a gyroscope to help aim. All of this is fine with the organizers who have allowed laser sights for a decade.Even so, the winner this year was someone with a regular peashooter so it still is quite a bit about skill. Pea shooters fight it out for world championships via BoingBoing
Topic by fungus amungus | last reply
Good evening, We are two students who are currently working on our startup project where we are developing a product for the electronics industry. A large amount of research has been made and the theory/concept of our product is in place, but we are of course open to suggestions. As we are in the process of developing our first prototype, we are now actively seeking for an electrical engineer to join our team. As a part of our team, you would become a Co-founder and receive equity in the business entity. We found Instructables and thought that there might be an interest for these type of projects from its members. We are actively seeking a person with an electrical engineering background or similar, who is familiar with the process of prototyping, to join our team. The process of developing a first prototype will include evaluating and matching components, product specifications, product functionality and testing. The goal is a prototype that gives proof of concept with verifiable data that can be used while meeting with investors. Several investors have already been contacted and shown interest, including major angel investors from New York Angels etc. We do not expect you to know everything, we value commitment and passion over 10+ years of experience and it is important to us that you share our vision and mission. All we require is that you have knowledge within electrical engineering and can bring something to table, especially in the prototyping process. We are located in Honolulu, Hawaii, but are open to working together with you remotely. Feel free to reach out if you feel that you can be committed to the project and seek a challenging co-founder tech related position! Best, Anna & Oliver firstname.lastname@example.org
Topic by Tech Startup | last reply
Hi, Just a quick question... I ran across something called Gmod, or Garry's mod software today by accident. This one here... http://www.youtube.com/watch?v=Ui7S1ToK49Q&feature;=related It looks pretty neat, sort of a mechanical play thing. But, I'm not sure how true to reality the software is, also you apparently need to own a main platform software to use it, like Half Life. I don't have any of the games needed to play around with Gmod. I started to wonder if there is any other software out there that works as an, across the board experimenter's virtual lab? Sort of a mechanical, electronics virtual plaything? I'd think that engineering tech schools would have software such as this, (CAD comes to mind) but I didn't quite find what I was looking for with a google search... Not exactly sure what the best search term would be for something like this? I've come across virtual electronics software, but maybe I'm asking too much for a multi electro-mechanical environment. Has anyone ever used software like this, particularly something fun to play around with, without being to dry? Free would be nice as well, but I'm probably pushing the envelope there a bit! LOL.
Topic by bart245 | last reply
Can I have a silly technical question for which I would have known the answer if I only paid more attention at school? how is possible that stereo headphones, ie 2 speaker circuits use only 3 cables? I understand the "ground" is the one that both speakers,ie left and right have in common but how come it doesnt bother the signals which go to the speakers? doesnt the left signal get mixed up with the right signal? and why is it called "ground" when it's not actually connected to the ground, like for example lightning conductor is? I've read through the wikipedia article about TRS several times but still can't understand it. thanks for answer, I promis I won't forget it this time :)
Topic by tap | last reply
I am in charge of the electronics section at urban ore, i welcome all of the Instructables community to come and use all of the weird esoteric tech i have laying around. you name it, i have it or will get it soon. I used to teach electronics in the arts at SF state and can help with problem solving your project mention this forum and i will cut you a deal on what ever you need. Andrew
Topic by bramerandrew | last reply
I finally worked out most of the bugs in the car, and it works! the entire car is made out of Fishertechnik (though 1 of the pieces is modified). the back is pretty basic, just a motor with a gear that meshes with the one on the back axle. that ends up moving the car. the front is cool, instead of having the motor spin the front axle to turn, i hooked up the front to turn like a real car. the motor turns the steering wheel. that pushes a connector to the right or left(depending on which way you want to turn) and that turns the front wheels making the car turn. i also mounted a air cannon on it. that uses the on modified piece. you see, i used a film canister type thing with one end plugged up to make the cannon hook up. i then put two air connector things( i forget the name) into the back piece. i hooked pipes up it it from a pump. a spiecal valve lets air only go in not out, making air pressure in side of the cannon part. that eventually shoots the cap off. it goes about 10 feet. unfortanitlly the cannon is manually activated because the canister slowly leaks air from it. i used to have it hooked up to a motor but it did not give big enough pumps so the cannon would not fire. so does anyone want instructions? i know, kitemans law but it will take me for ever to make instuctions so i want to know if anyone will actually build it.
Topic by dsman195276 | last reply
Some1 brought the following quote to another forum i am inits sure been copy pasted alot of times before me. the original author is unknownI was working in a job running the campus email system some years ago when I got a call from the chairman of the statistics department. "We're having a problem sending email out of the department." "What's the problem?" I asked. "We can't send mail more than 500 miles," the chairman explained. I choked on my latte. "Come again?" "We can't send mail farther than 500 miles from here," he repeated. "A little bit more, actually. Call it 520 miles. But no farther." "Um... Email really doesn't work that way, generally," I said, trying to keep panic out of my voice. One doesn't display panic when speaking to a department chairman, even of a relatively impoverished department like statistics. "What makes you think you can't send mail more than 500 miles?" "It's not what I *think*," the chairman replied testily. "You see, when we first noticed this happening, a few days ago--" "You waited a few DAYS?" I interrupted, a tremor tinging my voice. "And you couldn't send email this whole time?" "We could send email. Just not more than--" "--500 miles, yes," I finished for him, "I got that. But why didn't you call earlier?" "Well, we hadn't collected enough data to be sure of what was going on until just now." Right. This is the chairman of *statistics*. "Anyway, I asked one of the geostatisticians to look into it--" "Geostatisticians..." "--yes, and she's produced a map showing the radius within which we can send email to be slightly more than 500 miles. There are a number of destinations within that radius that we can't reach, either, or reach sporadically, but we can never email farther than this radius." "I see," I said, and put my head in my hands. "When did this start? A few days ago, you said, but did anything change in your systems at that time?" "Well, the consultant came in and patched our server and rebooted it. But I called him, and he said he didn't touch the mail system." "Okay, let me take a look, and I'll call you back," I said, scarcely believing that I was playing along. It wasn't April Fool's Day. I tried to remember if someone owed me a practical joke. I logged into their department's server, and sent a few test mails. This was in the Research Triangle of North Carolina, and a test mail to my own account was delivered without a hitch. Ditto for one sent to Richmond, and Atlanta, and Washington. Another to Princeton (400 miles) worked. But then I tried to send an email to Memphis (600 miles). It failed. Boston, failed. Detroit, failed. I got out my address book and started trying to narrow this down. New York (420 miles) worked, but Providence (580 miles) failed. I was beginning to wonder if I had lost my sanity. I tried emailing a friend who lived in North Carolina, but whose ISP was in Seattle. Thankfully, it failed. If the problem had had to do with the geography of the human recipient and not his mail server, I think I would have broken down in tears. Having established that--unbelievably--the problem as reported was true, and repeatable, I took a look at the sendmail.cf file. It looked fairly normal. In fact, it looked familiar. I diffed it against the sendmail.cf in my home directory. It hadn't been altered--it was a sendmail.cf I had written. And I was fairly certain I hadn't enabled the "FAIL_MAIL_OVER_500_MILES" option. At a loss, I telnetted into the SMTP port. The server happily responded with a SunOS sendmail banner. Wait a minute... a SunOS sendmail banner? At the time, Sun was still shipping Sendmail 5 with its operating system, even though Sendmail 8 was fairly mature. Being a good system administrator, I had standardized on Sendmail 8. And also being a good system administrator, I had written a sendmail.cf that used the nice long self-documenting option and variable names available in Sendmail 8 rather than the cryptic punctuation-mark codes that had been used in Sendmail 5. The pieces fell into place, all at once, and I again choked on the dregs of my now-cold latte. When the consultant had "patched the server," he had apparently upgraded the version of SunOS, and in so doing *downgraded* Sendmail. The upgrade helpfully left the sendmail.cf alone, even though it was now the wrong version. It so happens that Sendmail 5--at least, the version that Sun shipped, which had some tweaks--could deal with the Sendmail 8 sendmail.cf, as most of the rules had at that point remained unaltered. But the new long configuration options--those it saw as junk, and skipped. And the sendmail binary had no defaults compiled in for most of these, so, finding no suitable settings in the sendmail.cf file, they were set to zero. One of the settings that was set to zero was the timeout to connect to the remote SMTP server. Some experimentation established that on this particular machine with its typical load, a zero timeout would abort a connect call in slightly over three milliseconds. An odd feature of our campus network at the time was that it was 100% switched. An outgoing packet wouldn't incur a router delay until hitting the POP and reaching a router on the far side. So time to connect to a lightly-loaded remote host on a nearby network would actually largely be governed by the speed of light distance to the destination rather than by incidental router delays. Feeling slightly giddy, I typed into my shell: $ units 1311 units, 63 prefixes You have: 3 millilightseconds You want: miles 558.84719 / 0.0017893979 "500 miles, or a little bit more."
Topic by 11010010110
A friend forwarded this job posting, figuring Instructables users might be interested!It sounds like a fun place to work:Lick-Wilmerding is a pretty cool high school in San Francisco. Bothour daughters went there. They have a full mandatory shop course forall students -- woodworking, metalworking, glass, architecture, etc.This is a job posting for a new tech director.Job posting info here. They also have listings for English, History, and Math teaching positions.
Topic by canida | last reply
Hey all. I would love to start working with circuits more than I do (I know the basics of circuits, soldering, mostly practical knowledge). I would really like to start doing a lot more with building projects that really utilize circuitry. So my question is: What are some fun and easy projects that I can get started on? Appreciate any help :)
Topic by MainManLuke | last reply
Clean water is becoming scarce and chlorine is a dangerous substance to be hauling around in the Third World. The dirty secret in water processing is that ozone works just as well as chlorine. How about coming up with a small handheld device which could sanitize small amounts of water using the local atmoshere by turning o2 into o3. I'm thinking aquarium pump to begin with.
Topic by Mud Stuffin | last reply
Instead of the traditional methods, this surfboard is based on a core that's made up of nearly 400 pieces of cut cardboard that intersects and is then coated with fiberglass and resin. So far it's only a one-off, but more will surely be made.When it came time to replace his old surfboard, Mike Sheldrake decided to build his own. But the former Web programmer didn't have the sculpting skills to carve one out of foam the way professional builders do. So he used 3-D modeling software to design a snap-together deck that's as sturdy as a conventional model and performs just as well, made from the cheapest material he could find: cardboard. link
Topic by fungus amungus | last reply