help me to made my own power bank

Can i make power bank with button cells battries ?

Topic by alireza8858s   |  last reply

How to administer a tiny painful (but safe) electric shock...

I have no electronic's experience, but I need to develop a tiny device that can administer an electric shock for just like 1 sec that is strong enough to hurt, but is safe.  And it has to be no larger in diameter than a US quarter coin, and no thicker than maybe the face of a watch.

Topic by Dolmetscher007   |  last reply

I want a power outlet that automatically shuts off after a period of time.

I want a device to plug my air compressor into that shuts off the power if the compressor runs for more than 20 minutes at a time. I leave my air compressor on and I am afraid that a leak will develop or a hose will burst leaving my compressor to run hours or days before I find it. I want it to sense when the air compressor starts pulling power and starts a timer. If the compressor is still running when the timer reaches either a preset time of around 20 minutes or an adjustable time, the power to the compressor is shut off until it is manually reset. My compressor is 110 volts and I live in the United States. Maybe such a thing exists but I haven't been able to find it. Thanks for your help, Kris

Topic by kingmanson   |  last reply

Off-Grid Stealth Cabin Plans

Hi everyone, I just entered my off-grid cabin design in the outdoors contest and I would like to invite you to view it, leave feedback and vote if you like the cabin and off-grid systems. I am a long time off-grid homesteader and I live in a 14x14 solar and wind powered cabin with many off-grid systems of my own design. My contest entry: Thanks LaMar

Topic by LaMar Solarcabin   |  last reply

Controlling anaerobic digesters with arduino

Hi I am new on the Arduino scene and I am trying to build eight anaerobic digester tanks to conduct experiments for my thesis in engineering. The setup will look as follows: -Arduino mega -Arduino motor shield R3 -Two motor stirring the digester at different RPMs. Motors will run at 12 V and around 0.5-1 A. -The motor shield will use the wall jack as power supply via an AC-DC adapter. -Biogas volume measuring device (tipping sensor) -Aquaria air pump to supply Hydrogen Sulphite consuming bacteria with oxygen. This will be controlled with a relay and the volume measuring device. -The pump will use the wall jack as power supply -Temperature sensors DS18B20. -Immersion heater controlled by the temperature sensor and a relay. The digester is supposed to be kept at 37°. Everything will be logged but I haven’t decided if I will connect a Ethernet shield or if I should log on a SD card. I think that I can manage to build it but I have some questions (a lot) but will just post some and post more later. The experiments will run for 4-6 months how will the Arduino, shield and relays handle being on for that long? Do I need something with higher quality? (It would suck to burn down the university) Any spontaneous thoughts that I should know or that could help me?

Topic by joche11   |  last reply

i want u know your answer about new PCB board concept which i'm gonna deveolp

i'm gonna make something different, which is new pcb board concept so, I want u to give me your personal opinions That are just 5 questions, so it took within 5 min. :D

Topic by GS YU   |  last reply

what is the instructable robot's name?

I was just wondering if the  instructable robot has a name anyone know?

Topic by bravoechonovember1   |  last reply

Whatzitcalled? copy drawing bigger or smaller.

Also used with a router.

Topic by Toga_Dan   |  last reply

Advice needed! how transfer designs to fibreglass sculpture

Hi I have a design submission to decorate/paint a 3 foot high fibreglass Rabbit! I want to create a pattern similiar to a wallpaper flock pattern but I don't really want  to do it all by hand. I thought I could design my pattern and create a decal, transfer, (acrylic image transfer is something I am hearing and reading about) and apply it to the rabbit. Any tips or suggestions would be great. P

Topic by aluapartx   |  last reply

PVC Pipe Toys

Hello, I am developing a line of toys made with PVC pipes. Take a look at these two instructables. and

Topic by nicolaudosbrinquedos   |  last reply


Hello sir,  Im intrested in solenoids feild and wanna have practical experince in that.can you please tell me how to generate electrical charge by using solenoids and storing that charge in mica capacitors with less voltage rating high storage capability..which also has slow discharge. The time of storing the charge should be high.Hope will guide me. Thankyou. Raghudeep,

Topic by RaghuC   |  last reply

Need help with mould

Hey everyone  i am looking for some assistance or advice i have created a sculpture for a project i am working on and would like to reproduce it what would be the best  mould to use to be able to reproduce this ,i have added 2 images of my sculpture if it helps at all  any and all help would be greatly appreciated

Topic by FrancesS3   |  last reply

Things you can make with urine?

Greetings, So far, I have learned that one can make phosphorus, ammonia, and potassium nitrate from urine. And of course it can be purified for water. I am wondering what else can be made with urine instead of wasting it? Thanks

Topic by NeuroPulse   |  last reply

Laser Engraver Circuit Help

Hello. I am making my own laser engraver out of 2 DVD burners just like Groovers version. I have some questions about the circuit that im going to use: I have seen the typical LM317 circuit for laser diodes (LINK HERE) I dont completely understand the circuit Groover made. He says that he uses the LM317 circuit over, but it does not look exactly the same. Can someone explain to me a bit why his values on the resistors/capacitors etc. is so damn different? (Though he also use relays and stuff for outputs for fans ) (LINK TO GROOVERS CIRCUIT) I made my own circuit that uses the typical LM317 circuit over, but will my circuit work fine? (Instead of the battery in the circuit, I will connect the Voltage In-ping on the LM317 to my arduino, but not exactly sure where to connect it on the arduino since i need about 7.5 V in, and not sure if the arduino got a pin that can output that much?) (LINK TO MY CIRCUIT) Thank you for your reply!

Topic by aborge   |  last reply

Links in articles should open a new tab

When links in projects are clicked on, the browser immediately takes you to that page. This loses the Instructable topic unless you page back to it. There should be a way to set the site up so that links open new tabs. I know because I moderate and manage a programming forum. Thanks! Ted Weissgerber

Topic by BurgersBytes   |  last reply

My Instructable won't publish-2nd user

I also have a problem not seeing my Instructables as non-logged in viewer ! It has been more than 5hrs and I still cannot even find it using Search facilities of Instructables. My profile should update to 9 but remains stuck at 8 instructables.

Topic by tonytran2015   |  last reply

Wearable Technology

Which is the most innovative wearable technology till date?

Topic by v_s   |  last reply

Rings of Light: Bending u-channel stock

Hello! I'm trying to make rings of brass with a channel/groove on the inside to fit LED strips into. I want the LEDs lining the inside of the brass rings to illuminate the center, but I want them hidden from view for aesthetic reasons. I'm trying to get 7 different rings, varying in diameter from about 7" to 2'. I can't figure out the best way to do this though. Here are some possibilities I've come up with, and I would love your thoughts on their feasibility, how I might tweak them for better effectiveness, or if you all have other ideas that might work better! 1) Bend U-channel stock in a tube bender. Would this deform the u-channel, though, and can rectangular stock go through a bender? 2) Mill a small trench shallower than a standard u-channel into bar stock, then bend it. See concerns in #1. 3) Somehow mill a channel into bar stock once it's already bent..? 4) Bend hollow tubing into a ring, then use a cutting disc or bit on a dremel to cut an opening on the inside, and snake the LED strip through the tubing. 5) Bend hollow tubing into a ring, then drill out holes at the interval of the LED lights, and snake the LED strip through the tubing. Thanks so much for your thoughts, feedback and help! :)

Topic by nealulrich   |  last reply

Paper folding machine/jig?

Hi all, i was wanting to know if anyone knows where i could find a tutorial on how to make a paper folding jig/machine for my bookbinding to help get better folds. or if any one would like to give me some tips on how to make one 

Topic by king_killer 

Albany Public Library STEMpunk's Strawbees Build Night

In May of 2015, Albany Public Library STEMpunk hosted a build night inviting community members to come and experiment with Strawbees.  Kids, teens, and adults messed around and created a wide variety of projects ranging from costumes to airplanes to math aids.  We all had a blast, and created some Instructables along the way! Here are links to the Instructables created from our build night: Knight's Helmet Custom Lampshade And here are some pictures of some other creations we made! Also, the Knight's Helmet has gone in to have a life of its own in a web series being created here at the library by its creator.  The series is called Ulrog, and uses many other cardboard and Strawbees created costumes.  Check it out here!

Topic by Albany Public Library STEMpunk 

Get electromagnetic pulses from a gas igniter

Hi, here I have a common gas igniter like this: Well, I removed the circuit from the box, then I shorted the two terminals, using various kind of coils (thick wire, thin wire, in various configurations and with different turns), but seems that this circuit is unable to generate electromagnetic pulses; I've tried to turn on a fluorescent lamp, to cause interferences to a pocket calculator (as I can see in various videos on youtube), but nothing happens. If I remove the coil from the terminals I am able to get nice sparks. So, why this circuit won't work as expected? I miss something? However this is the circuit: Please note that I'm aware of the fact that these kind of circuit could be dangerous; I'm taking all possible precautions (I'm using it far from any electrical device, I'm using isolated gloves, and so on). I just want to make this circuit for fun. Many thanks.

Topic by akopelumenuscu   |  last reply

Are you up to the Full Metal Challenge?

I just made a wooden key ring, but I think it would be much better in metal. Are you up to making one? If you post a picture, here's a full year's Pro membership up for grabs. Have a look at step 4.

Topic by Kiteman 

transformer for neon light

Hi- I have a couple of transformers for some neon lights I got at a place going out of business. I'm never going to start bending/blowing glass so if anyone else has need of the transformers (or the tubes of glass!) I'll be happy to give it away for the postage. Call if you want pictures or have questions. 813-541-2137 Terre

Topic by terrefirma 

Arduino uno &Gsm modem

Can any body tell me that is there any difference btwn. Arduino gsm-shild  and normal gsm modem .?Do i have to code Arduino differently to send data when i'm using normal gsm modem ..?? and how can i connect Arduino-Uno to normal gsm modem..???

Topic by MeetR   |  last reply

Bluetooth sensor

Hey guys, I like electronics but I want to learn about bluetooth interfacing. As a start I want to send a signal from a push button/sensor to another bluetooth receiver (phone for example). To be honest I have no idea where to start from. Can you help me out?

Topic by pjreijiri   |  last reply

Outdoor Suspension Worktable: Thin, Rigid, Strong, Lightweight Panels/Sheets

Hi all! I go into the wilderness with my research and build electronic gizmos. See this overview of our camp: and the desk in question! To support this me and Hannah Perner-Wilson have been trying to create tools for infrastructure for backpacking in the wild (also see her wearable studio descriptions The tool im working on right now is a modular lightweight desk we can suspend between trees. It's actually going pretty great! You can see Matt here soldering and building on this bench. it worked WAY BETTER than expected. I though it was gonna be TOO wiggly, or bouncy and impossible to work on. Turns out, it just worked really well! the only PROBLEM however was with our panels. I used these sheets of like MDF (or something). They are that material that pegboards are made out of. They were great because they were thin and rigid. But they were still pretty heavy and they absorbed water. I want your advice on materials. I want something that Is rigid! (will hold its own shape under compression and/or tension) Can support lots of tools and stuff on top Strong (will stand up to beatings in the field, and smashproof inside backpack) Thin (packs into backpack well)   Cut-able (less important) (won't give off evil fumes or particles if i need to cut or modify it at home (or even in the field) Not crazy-beans expensive (like it seems like carbon fiber panels are) I was thinking like fiberglass maybe? is that a good idea? Carbon fiber (though super expensive)? what are your ideas?

Topic by blorgggg   |  last reply

How can I hang a bottle and have a lamp cord going into it at the same time...

Howdy, I've been inspired by this type of craft: I know there are many who sell completed type setups, but as I'm trying to save the money and would like to hang my personally emptied bottles I've done a lot of internet searching for over a week or so,without luck. I'd like to hang a bottle with a lamp in it, but the bottle has no threading to insert pipe fittings or whatnot, and I can't tell how the bottle was hung. Any ideas are appreciated, I'm going to continue to look. Thanks.

Topic by barry_015   |  last reply

Question about sanding wood

Anybody have a tip on how to sand smooth many small discs of wood? Rather than do it all by hand with sanding paper I mean… Is there a (cheap) sanding tool that I can purchase? Not something like the Dremel, Im thinking more about something with a flat sanding surface. Thanks anybody that will answer.

Topic by marcellahella   |  last reply

Login troubles

Hello. I apologize in advance for my English :-) I have the following problem. I discovered an interesting topic, and found that I did not authorize. Clicked "Login" - "Google +" and logged in. Then I went back to an interesting topic, and it looked like I was not authorized. So I was not able to add the topic to the collection :-( On other topics and the whole site everything looks fine (authorized).

Topic by ArtemR1   |  last reply

Infinity Mirror + Music Synced LEDs

Hi guys! Well this is my first post here :) So I was just browsing some projects and saw two really good projects. First was this infinity mirror and the other one was how to sync leds to music using tip31 transistor. So i wondered can I combine these two projects to make one music synced infinity mirror? Of course I can't do it without some help (newbie to electronics n stuff). So can you guys just help me or guide me? Thanks in advance :D

Topic by vmahajan3   |  last reply

to Kluge? or not to Kluge?

When ist acceptable to kluge? When ought more go into a project?

Topic by Toga_Dan   |  last reply

Harvest Grain- with a Hedgetrimmer?

Has anyone tried cutting tall grass with a hedgetrimmer? It does resemble a sickle bar mower, at least superficially. I've never quite gotten the hang of the scythe, and although the gas chainsaw does work, it's an awful lot o noise. This year, the slender wheatgrass, which is usually xeriscaping and erosion control will be harvested for chickens ! I'm thinkin of buying a Ryobi cordless trimmer. 

Topic by Toga_Dan   |  last reply

Growing, Harvesting Grain

Http://  Slowly learnin this stuff. Havent really mastered the scythe. grow grains as ground cover/erosion control/xeriscape, but plan to harvest it  for chickeN feed. Any of yall have experience to share?

Topic by Toga_Dan 

cake + machanics

Hi everyone one i need help im making a cake for my little boys birthday. he would like a dragon cake but he wants the wings to move up and down. ive never made a moving cake and i cant find anywhere that tells me how to achive the wings going up and down. i know how to make them go round but not up and down. so i was wondering if any u kind people can tell me exactly what i need to achive this. thank you so much for taking the time to read my post. 

Topic by epaton1   |  last reply

Arp Odyssey 1975 Help

Hello,  I recently found an old arp Odyssey from 1975, however it does not work. I have tried to clean the sliders because they were really junky and I tested the power supply and I know it outputs 15v and 5v, although I think its supposed to be -+15v. I really like to do electronics and I just need some pointers on what I should focus on what might be wrong. Thanks

Topic by mathesen1097 


Can anyone tell me what happens if you take two 1.2v, 1900mAh  rechargeable batteries in parallel connected to an LED?  Does it increase the amount of time the LED will stay on?   I'm new to this.  Working with small solar charging lamps.  Thanks Patty

Topic by PattyCA   |  last reply

Electrically conductive clear resin or additive?

I'm looking to craft some tiny 2mm buttons for a smartwatch face plate. I've got the design down, but I can't get the screen to register the presses. After some digging I learned enough about touch screens to know why. The buttons are going to be cast in a clear orange resin designed to pick up light from the screen below them. Does anyone know of a clear additive or resin material that can sufficiently conduct electricity over a distance of no more that 5mm? If you have any scraps of clear white or clear orange resin. Try using it as a stylus on a smart phone or tablet. If the screen registers the press, let me know please! Also, first time posting here, so bare with me if I have overlooked any sort of etiquette. 

Topic by rgorman4   |  last reply

How to add 2nd battery to circuit or increase voltage

I have a Normally Closed NPN inductive proximity sensor which operates at 10V. I use it to control a load (light bulb), which is normally on, and goes off when the proximity sensor detects metal. The problem is that I need to work with portable batteries, or something like an acid battery, and ideally not exceed 12V for safety reasons. Since the sensor needs 10V to operate, this only leaves me with 2V for the light bulb. I need to increase the voltage to the light bulb so that I can use a decent light source. Is there a way of adding a 2nd battery to the circuit so that the bulb has its own power source, yet that too is controlled by the sensor (otherwise the bulb would just stay on continuously). Any other solution would also be appreciated. Current circuit diagram attached. Thank you.

Topic by nathanimate   |  last reply

Webcam to Video Capture Card (s-video)

I have a webcam (usb) which I want to connect to video capture card (Osprey 100) having s-video input port. How could I do this? Is it possible? 

Topic by Zoliana   |  last reply

Is it hard for you to get answers to hardware problems and connect with connect other makers? We have an upcoming solution

MakrConnect is a networking platform for makers to problem-solve, share ideas, and collaborate. We are currently incubated at MIT Launch. Post your questions on our platform and other makers will provide you with solutions. Furthermore, MakrConnect will build social aspects upon our forum infrastructure. We will allow you to share your projects, build your profile, and even find makers near you to work on projects together in person. We believe that with MakrConnect, making will be easier than ever. Please take a few seconds to sign up on our mailing list at Stay Awesome!

Topic by jliang5   |  last reply

Heating box

Hi everybody First of all I want to excuse myself if my english is not perfect. I have a project in mind for a while. I work on construction in Canada and using caulking everyday it get hard to use it during winter if we don't have access to put them inside. So I wanted to build a little box with an heating system that could work on a jobsite generator. I'm thinking about a plywood box nothing fancy as long it work. I though about place 10 ABS/PVC tube that fit perfectly the caulking tube with alots of hole in it so the heat can pass throught it. So the caulking tube can be reached right from the top of the box and due to the hole it won't overheat. So that's the idea so far. What heating system should I use for this system(I don't want to spend alot on money). Maybe I'm thinking about  1 or 2 computer fan to make the heat uniform. I'm thinking about a space where I can put my spare glove to get them dry do you have an idea for that ? And finaly I'm open to any suggestion that can get the box even better ! :) Thanks you

Topic by Lufkum   |  last reply

Build Night Jameco en The Inventors House

El pasado jueves 24 de Agosto se llevo acabo la segunda Build Nigth en The Inventor´s House patrocinada por Instructables y Jameco En esta ocasión decidimos realizar la build night durante el día, para ser precisos a mediodia, nuestra intención fue que la familia se reuniera para hacer inventos con electrónica, El evento comenzó a las 12:00 hrs. se coloco todo el material electrónico en el centro de las mesas, varios venían preparados con material extra como cautín, arduinos, GPS, Xbee y algunos tutoriales visto en internet. Lo mas genial de todo fue que contamos la presencia de niños, papas, jóvenes y de hasta la TV local!! Que hizo un reportaje Enseñamos un poco de electrónica a pequeñas niñas que encendieron su primer led,  varias personas tuvieron su primer contacto con la electrónica y crearon geniales proyectos. Para ver todas las fotos tomadas durante el evento no olviden visitar nuestro album de facebook Estamos listos para recibir el material de la próxima build night de septiembre patrocinada por Lumi Sin mas, gracias a Jameco e instructable por la experiencia, saludos desde Aguascalientes, México.

Topic by sabas1080   |  last reply

Is cashcrate real?

I found another money making site; cashcrate. I just wanted to know if anybody have been using it and make money from those guys.

Topic by Plasmana   |  last reply

Can I use instructables as a referee

Hello, This might seem like a very strange question.  I am looking to apply for a bursary from The Worshipful Company Of Turners. They require two referees who are happy to stand by my skills and character.  I have already asked the chairman of my local wood turning club who I think would be a great traditional reference for me. But I think instructables would be an awesome reference to show a wider reaching impact than most people could think of. (Hopefully this could give me a bit of an advantage over people who might pick only people who happen to be within a relatively small proximity).  I hope that my engagement within the instructables community will leave you feeling very positive about backing me up for this application.   I would require a name address and post code in order to use instructables within this application and would really love to be able to do this.  Kind regards, Philip Bradley / AKA World of Woodcraft PS for more information regarding the bursary here is a URL

Topic by world of woodcraft   |  last reply

Fashion Designer?

Anybody on here want to be or already are a fashion designer?

Topic by Abigail08   |  last reply

IMovie Help: how to change the speed of a clip

Hey everybody I was editing some video and found out that the option of changing the speed of the clip is greyed out. Anybody know how to solve this problem? Thank You Im using OS X Yosemite 

Topic by robo10302   |  last reply

Individually Addressable Speaker Array

Hey! I had an idea for an array of many small speakers, each capable of playing different sounds so I could dynamically re-arrange which speaker is playing what. This would be paired with some LEDs and some water to make (what I hope will be) a fantastic visual effect. But of course all this is a bit over my head, so I'd like some feedback on my idea! After a bit of research, here's how I think I'll do it: General Concept Essentially what I'm trying to do is make a waveform generator with lots and lots of separate channels. I would hook up my microcontroller to several, multi-channel Digital to Analog Converters (DACs). The microcontroller would feed these DACs signals to generate the wave forms that I want for each individual speaker. The waveforms that the DACs output would each go through an extremely simple amplifier. The amplified signal would go to my speakers. I've attached a diagram that should give you a better idea of what I'm doing. Specifics The microcontrollers I'm looking at are the ChipKIT series from Digilent because I have access to a bunch of these. I'm currently planning on using the uC32, but I actually have access to pretty much all their other boards. The uC32 runs at 80MHz. The DAC I'm looking at is the AD5628 from Analog Devices. That's used in Digilent's PmodDA4, which I also have access to. Alternatively I might just order a bunch. They have 8 analogue outputs, and the SPI communication can run at 50MHz clock speed. I'm planning to have eight of these (for 8^2 total outputs). I haven't figured out what amplifier I'm going to use yet. It'll need to be simple and cheap, as I'm expecting to have 8^2 of them, but I'd also like one that can operate over a large band of frequencies. I've also attached two pictures of the speakers I'm planning to use. I kinda randomly acquired a lot of these, so I'd rather not switch to a different speaker type. According to Wikipedia, the highest note on a piano keyboard is a little over 4kHz. If I split the sinusoidal wave into 16 segments, that means an update frequency of 76kHz. This is way below my max operating speed of 50MHz so I think I can get away with it. Questions What am I doing wrong? I'm hardly an expert on any of this, so I'm certain there's a much simpler way. Are there ICs that do what I want? Maybe something that takes in a digital signal and outputs waveforms? This would be similar to how a servo controller would output different PWM signals, only changing the frequency rather than the duty cycle. What sort of amplifiers should I be looking at? This is my first time on the forum so please let me know if I'm doing anything wrong (or could do anything better).

Topic by JayWeeks   |  last reply

Need a detailed guide about Solar Energy

Can someone share in detailed about Solar Energy? I want to know in detailed about these solar topics likes- Sun's Energy Supply, Photovoltaic and about sun radiation. Please share in detailed so that I can clear my doubts. Thanks

Topic by AlexanderK11   |  last reply

The link to my profile is not working

If I try to get to my own profile through the menu at the top of the page (see screenshot) I always end up on an error page that says 'ERROR 400: no member: - ERROR 400: no member:' Looks like the URL in that link is malformatted. Screenshot shows the error message as well as the menu entry I clicked to get there.

Topic by Moem   |  last reply