Does anybody know how to build or get a pump that costs maybe like $20 that will pump to at least 400 psi?
Topic by waterrocketexpert | last reply
I have an Arduino Duemilanove and was wanting to know how and/or what I need to do to create a high frequency signal. I dont have a set frequency in mind but would rather know how to change it so I can gradually step it up until I get desired results.....Have looked at a lot of stuff on google for how to do this and most refer to a wiring.c file but mine appears to be an updated version to what they have...Anyways any help would be greatly appreciated =)?
Question by afreeland | last reply
I'm going to attempt to make a super micro tesla coil that is 100% contained (unless it runs off of like 12 volts dc, then I'll use a wallwart). Of course, one of the i biggest problem is the power supply. So this is what I'm asking, what's the best way of ramping up the voltage? A tiny toroid transformer? An inductor that gets pulsed? Voltage Multiplier? Something with static electricity? Some type of Inverter? Using Greinacher Cascades? A marx generator hybrid? Other stuff I havn't heard of?
Topic by guyfrom7up | last reply
I'm starting to work with high voltages again, but for real this time. I just built an ignition coil driver, using a 555 (and I got an ignition coil), but my 555 broke (the texas instruments ones can only drive 15mA, oppose to the normal 200mA, oops) so I have to go buy one today. My main question is what to use for ground, whether it be for an old screwdriver for arcing sparks or the secondary of a tesla coil. I was originall just going to use the 3rd prong of an outlet, but somewhere on the internet I heard this could destroy all surge protected power strips and destroy all plugged in electronics at your house. I, of course, do not want this cause... well... I'd be screwed. Is this true or not? Can I use the 3rd prong?
Topic by guyfrom7up | last reply
Before the begining sorry for bad english I want to make laser tag with electric shock when hits This is circuit of taser what I want to do is remove the switch and replace with wire so that the taser can charge automatically then I want to put a phototransistor(that react to red laser) to the poles(where you get shocked when touch them together) but because the both poles are attached to bodies the taser can't be charged so I tried to block one side of pole with phototransistor but when I touch the two poles phototransistor burned(?) and I got shocked in this case what can i do?
Topic by hyeok205 | last reply
Do you teach 9th-12th grade? If so, say hello and connect with other High School educators. Feel free to share where you are from, what grade level(s) and subjects you teach, and any exciting projects you did with your students this year or fun plans you have for your classes next year. :)
Topic by WeTeachThemSTEM | last reply
I'm wanting to build an electronic version of the popular carnival game High Striker. I would like it to be done with LEDs as the way it displays the power of the strike. This way i can arrange them however I need to. It's going to be themed to look like lightening, so they won't be in a perfectly straight line. Thanks in advance for any input.
Question by Dustin Cox | last reply
I want to go to auto academy at my high school but my parents say no because that everyone that is in there is"bad people that do drugs and smoke and that i will do that too" but i know alot of people in there and no one does that how can i convince them to let me? i already talked about it for hours and they still insist i dont and its very anoying
Question by BIGHAIRYDUDE | last reply
I am trying to build a high voltage amplifier that will amplify an AC signal of approx. +-5V to a signal of approx +-100V. I was looking into building a common-source amp using JFETs or a common-emitter amp using BJTs, but both seem to have an output waveform of 0V to +100V. Is there a way to modify these amps to have an output waveform of -100V to +100V? Also, if anyone has any better Ideas, please let me know. Mark
Topic by questionmark05
I found a flybacktransformer and I would like to sale it. its is nice and heavy built and would have a better duty cycle than one of the newer ones. I would like to get $12 for it. finding a flyback like this one is not always too easy. I added a mug to show the size of it.
Topic by inductionheat! | last reply
I need to measure Current from a welding machine to make a alarm if it goes down below some level for ensuring better quality of welding. The current normally set is of the order of 200A max with around 100V DC.Not sure if i could use some clamp-on meters and pass those values out to Arduino for switching circuit. Shunt resistors may be a better option. But to make a signal conditioner to convert the ma output will be a problem i guess..is there something i can do with Arduino.. any ideas guys....? Thanks in advance Chuppandi
Topic by chuppandi
I am creating a circuit and I need a not gate to run 20 3v 20mA LEDs. The only problem is that to run all of those LEDs (4 series circuits in parallel, if that will help) I am using 18 volts (2 9v batteries in a series). My circuit is compact (,think fitting inside an Altoids container) so a relay wouldn't work. So I need a high voltage way to make a not gate. I can read schematics if that will help you explain it, but I do need you to mention the ohms of the resistor. Thanks a million!
Question by GenAap | last reply
Hello guys, I have recently started working on a high altitude balloon project. I am planing on making a balloon that will go up to 100k ft and while it is travailing up to that altitude it will be snapping pictures and taking videos of the sky. I am publishing all the updates related to this project on a project dedicated website www.AggieSpaceProgram.com . However after i am done i will be also making a very deatailed instructable on it so others may fallow in my foot steps. I just wanted to share my project with the instructables community, L4I
Topic by looking4ideas | last reply
Look at a picture of some arcs from a common spark-gap Tesla Coil, and then compare it to the arcs from a solid-state. What makes the two so different? The difference comes from the Solid-State Tesla Coil to operate in CW (constant wave) mode. This means that its power supply is uninterrupted, whereas in a spark-gap type, power is being switched on and off hundreds of times per second. If the output terminal of a CW coil doesn't have a brake out point, no corona or spark will occur. For anyone who's investigating wireless power transmission or Tesla's version of radio, this is a very helpful feature, since corona only wastes energy. And if it does have a brake out point, it can create some pretty interesting spark displays, as I mentioned above. An arc to a grounded object increases the current in the arc to such a point that it turns into a white-hot "flaming" discharge. All-in-all, a CW type coil is a pretty interesting kind to observe. But solid-states can be pretty difficult and annoying to build, and expensive as well. Since solid-state technology obviously was not available to Tesla, he found a different way to operate his coils in CW mode- a generator that was specially designed to produce radio-frequency power. He had originally created it for high-frequency arc lighting. Today, I have seen absolutely no coils run by a high frequency alternator. Of course, an alternator would be admittedly difficult to build, but since it could probably deliver more power than a solid-state coil, it would be worth it. Does anyone know if there are any companies that still make these alternators? Would anyone be interested in recreating it? Should we even bother? Thank you for listening. Peace!
Topic by ElectricUmbrella | last reply
This just happened at my school, I thought you guys in this group would like it: This week on the announcements, our sports director told us about the new rules for football games. None of them were too bad, except for not being allowed to take off our shirts (sports bras for girls) any more, in order to paint our chests. We were all pissed, and determined to do something about it, so this night at the game, the entire spirit section (huge) just sat their quietly and didn't cheer at all. By half-time, we were down 9-0 and the cheerleaders were pissed that we wouldn't even stand up. The principal called down the kid in charge and they talked for a bit. When he came back up, he told us that she had agreed to not wearing shirts on the homecoming game, as long as we didn't use the "Bullshit" chant. A few minutes later, someone else went down and talked to her, they convinced her to withdraw the policy starting next week, if we would start to cheer this game. In the end, it was a great success, and we won the football game, too!
Topic by Weissensteinburg | last reply
Evening all, Following on from what Jessy has already said, I'd just like to weigh in with my own views on life at Instructables and the company's decisions to work in cahoots with Autodesk. I've been an Artist in Residence at Instructables now for two weeks, and they've been an amazing two weeks. The atmosphere in the lab is the sort of laid-back but productive work environment you can only find among people who really love what they do. They work, they play, they somehow produce an awesome, widely-loved website. And now it looks like a big, grown-up company has decided that the site's awesome too. As far as I can tell, that's a good thing. Everyone at the Instructables lab seems genuinely, if cautiously, optimistic about what the new regime will mean for the company. A bigger company can provide more resources, taking some of the load of the team's shoulders so they can introduce new features and more extravagant contests. At the lab, there haven't been any changes. Everyone's still doing the same jobs they were doing a week ago and, yes, yesterday afternoon we were still up on the same roof, shooting shaving cream at the same intern. All is as it should be. Instructables is run by a small tightly-knit team of makers, so I think there were a few concerns about how Autodesk might try to warp the company to fit it into a standard, corporate mold. So far, Autodesk has been doing a good job of putting those concerns to rest. The success of Instructables is deeply tied up with its staff being a flexible little troupe of amiable nutcases and the managers at Autodesk seem to appreciate that. They know as well as we all do that if they mess with the winning formula, they'll only screw things up. Instructables is built on its community (that's you, reading this) and the community won't put up with any changes that make the site a worse place to spend time. If they try to screw the site up, you lot will rebel. If they try to make us wear ties, Randy will rebel. Their plan seems to be to nurture and support the site with funds, people and expertise while interfering relatively little with how it actually runs. We've been over to the local Autodesk offices to meet up with some of their employees and they seemed like a bunch of overenthusiastic, slightly geeky maker types. Which is to say, they seemed just like the rest of the gang here at Instructables and, as far as I can tell, just like much of the Instructables community. They're people who like to make things. A lot of them have been using Instructables for years. As a company to work alongside, they seem like a good fit. It will be very interesting to see where the site goes from here, but my gut feeling is that it will keep on doing the same things it's always done, just more so. Hopefully that's something we can all look forward to.
Topic by PenfoldPlant | last reply
I am in need of a power supply that can give out about 500V @ 13A. I know it's high, but I want it to charge a capacitor(400V, 1000μF, 13A) for my coilgun. I've already tried a flyback charger, but the result was to blow the capacitor up(I think that it couldn't withstand so much voltage, despite the amperege was lower that its threshold). I don't want that to happen again and I want a relatively fast way to charge the capacitor. Also, the power supply needs to be portable. Another thing: the voltage is not mandatory to be THAT high; the amperage also(let's say...1 or 2 amps...)... However I need DC pulsating current, at 20 kHz NOTE: I really hope that I'm not asking too much.......
Question by N3v3rm0r3 | last reply
High speed bullet photography is cool - the precision of catching the bullet flying through a carefully-placed target. But how about hitting a moving target? How about hitting a single drop of water? Dutch photographer Alexander Augusteijn can do it, apparently using normal flashes, but with the timing controlled by computers. Lex Augusteijn Photography via PetaPixel
Topic by Kiteman | last reply
Question by ravebot | last reply
Yes, I know, It's an oxymoron. I've always wanted a high-speed camera, but they are way too expensive. I was wondering if any of you fellow Instructablers have a high-speed camera that you've lost interest in, and are willing to sell for a low price. Alternatively, if any of you know how to make a cheap, high quality, high-speed camera, could you post an Instructable? Edit: I bought a Casio EX-F1 a while ago, and even made an iBle about it. I also have a bunch of videos here.
Topic by Spl1nt3rC3ll | last reply
I heard disposable cameras use high voltage for the flash. so if you were to take out the capacitor from 2 and plug the lead to the flash from 1 camera into the battery holder for another you could keep putting them together to get higher and higher voltages right?
Topic by NetReaper | 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
For a project totally nonrelated to my tesla coil I need a way of regulating a voltage down to 36 Volts at 8 amps. My transformer (or a bunch of transformers hooked together) is suppose to have an output of about 38 volts at 8 amps, yet the voltage (with no load) is actually around 60 volts... Basically I need a way of regulating this voltage. For saftey, lets say the max input is 70 volts and it should be able to handle 10 Amps. The output voltage should be 36.
Topic by guyfrom7up | last reply
I've had this idea about a cheap high speed camera using say 10 of those small action cams, like this: http://www.ebay.com/itm/New-Worlds-smallest-Video-Record-Helmet-Camera-DV-DVR-black-free-shipping-/180766403888?pt=Camcorders_Professional_Video_Cameras&hash;=item2a16846d30#ht_4895wt_952 What you would do is hack the Start/Stop switch and hook it up to some sort of controller that starts each one of these 10 cameras about 3.3 milliseconds before the next one, thus having each frame from all the cameras to be 3.3 milliseconds apart from each other, which is 300FPS at 720p for $158. The cheapest HD 300fps camera.... EVER, not that i can make it. The cheapest equivalent is around 2K.
Topic by williamp321 | last reply
I'm looking at some instructables, and the simplicity of the cockroft-walton generator is quite interesting. Because I've always been fascinated by lightning and electric sparks (ever since I saw a wimshurst machine as a kid), I was thinking of building a CW generator, to power a small marx generator. Now, I found the parts, but I don't know much about electronics, so I have a few questions, and I was hoping someone here could help me out. 1) For ceramic capacitors, some are labeled for instance '15kV', while others are '15VDC'. I assume the latter only work for DC input, is this correct? 2) If I were to make a CW generator using a few 400V capacitors and a fuse (assuming I don't f*k up putting it together) like this: https://www.instructables.com/id/High-Voltage-Power-Supply-For-Marx-Generator/?&sort;=ACTIVE&l; imit=40&offset;=80 Is there a risk of blowing a fuse in the house, or is that fuse in the setup enough protection? 3) Is there any risk for other electrical devices, like a computer, when I plug this in? 4) I work at a computer repair shop, are there any useful components in power supplies, old screens...? Thanks in advance!
Topic by cgpirre | last reply
Hi one really random question that has really been annoying me for a while is What is stopping a helicopter (probably unmanned) form achieving a really freakish height, eg + 45 km - 80km range im not sure how big it would have to be, but the blades would not be regular and the talk would be have to account for the increases in speed and it probably could not it get itself to a high alttitude to start probaly need a ballon to take it up, and any ideas for testing? or any major theroy problems? and any tips or hint?
Topic by thelastonekills | last reply
I know you can use ws2801 led strips with Glediator and make a 10x10 matrix, but can I use a high power LED?I'm not quite sure what I'd need to make this work, that's why I'm here lolBy high power LED i mean something like this: https://i.pinimg.com/originals/67/d6/52/67d652f3ee83d4ad87aa5fe56c887cac.jpg
Question by Delta1Dan | last reply
I have a high voltage lamp driver that i took out of an old projector, I want to know if i wil be able to make a jacobs ladder or plasma globe with it? It supplies 25kv or 12.5kv on each of the two wires? it was used to power the lamp of the projector and it connected directly with the lamp wires. PLEASE HELP!
Topic by Francoisler
I've wanted to do this for ages: build a solar stand for a strawberry planter (or it could be for any other plant) with an extremely low RPM. I'd like it to rotate once every 48 hours so that over time all the sides get equal sun exposure. I'd also like it to be solar powered..... All the motors and kits I find are on hobby sites and they're tiny little things (plus even the high torque ones have RPMs above 1). I thought of using a clock mechanism, but there's no way it could handle the weight.... Any ideas where I could find what I need? Thanks!
Question by belsey | last reply
I bought a couple of red "Coast LED Lenser" LEDs from Frys (www.frys.com/product/4137893). They are in the standard 5mm package, but they give no forward voltage and the mA looks a bit high, being without a heatsink . If anyone can tell me if it looks correct and not a misprint, i would be very grateful, since coast doesn't have them on their website anymore. Oh yeah, while trying to light one I ran 8.5V@4.5A (PS2 adapter) accidentally (forgot the resistor) and it exploded loud pop instead of melting or burning out the junction like the 3mm LEDs from ebay, if that helps. The specs. Intensity : 10,000 mcd Directivity: 15* (degrees) Operating Lifetime: Up to 100,000 Hours Wavelength: 620nm IF30: mA IFP: 100 mA VR: 5V PD: 120 mW Topr.: -30* to +100* (degrees) I'm guessing the forward voltage would be about 2.00V +/- .20V
Question by LuciferTengu | last reply