Pepsi Refresh Submission

Please cast your vote for the CIR's Pepsi Refresh submission to Provide Cost-Effective Prosthetic Care in Underserved Midwestern Areas - http://pep.si/eo57my Video for the submission is available at: http://www.youtube.com/watch?v=x7gVKMypR7E

Topic by CIRnetwork 8 years ago  |  last reply 8 years ago


when i had made a usb powered fan if i short-circuit it what will happen anyone? Answered

Is it going to harm my pc

Question by paritoshbk 6 years ago  |  last reply 4 years ago


I need help with my tesla coil! please help!

Https://www.instructables.com/answers/9kV-50mA-tesla-coil-NST-question-Why-does-the-cir/

Topic by colinbarnes 6 years ago  |  last reply 5 years ago


arc welder/spot welder? Answered

Can an old small arc welder be used to make a spot welder? It's a 60 yr. old Grindl. A stamping on it says input amps 20, sec. amps rated .80- 80, welding volts 20, max open cir volts 80.

Question by hjones47222222 3 years ago  |  last reply 3 years ago


Is it possible to use a 12volt computer fan to circulate air in your car?

I would like to wire uone use to run off the 12volt socket in my car. I have tried the small oscillating fans and they don't hold up to the heat where I live.

Question by vcampos2000 9 years ago  |  last reply 9 years ago


What type of capacitors for Voltage Multiplier Circuit?

I want to make a voltage mutiplier circuit to get 30kV+ DC from 12kV AC, I'm not sure what type of capacitors to get or diodes. Also how many times does it multiply the voltage, for each set of 2 diodes and 2 capacitors

Question by JunaidA44 3 years ago  |  last reply 3 years ago


Need HELP in identifying items on a GPS unit's circuit board

I need to put items back onto this circuit board that came off. Just want to know what they are. In the picture below, they are shown with the arrow. One is a cylinder with "671 220 50z" written on it. The other is just a tiny rectangle with a solder connection on each end. My unit won't connect with satellites and I'm wondering if these that somehow came disconnected have something to do with it.

Topic by rhinson 11 years ago  |  last reply 11 years ago


How do I use a high power LED in a a low power circuit? Answered

I want to replace a remote control's low power IR LED  to a high power IR LED, or preferably an IR laser diode. Obviously replacing the original LED with the high power one won't do it. What is: 1) The easiest way to make it work? 2)The best way to make it work? If at all possible, link to a diagram or an instructable, that would be super! Thanks :)

Question by Morgantao 6 years ago  |  last reply 6 years ago


Connecting two or more disposable camera flash circuits together?

I was wondering if i could connect 2 or more disposable camera flash circuits together to charge the capacitors on my coil gun faster ? and how id do so?  i know that i could do this https://www.instructables.com/id/Coilgun-Handgun/#step1 but i dont want to take apart my circuits because there not all the same. thanks

Question by cfrenette1 6 years ago  |  last reply 6 years ago


Really small analog gauge controlled by simple circuit

I'm looking to make a steampunk version of dr who's sonic screwdriver with some LEDs, a tiny recording module for the sound, and I also wanted a little analog gauge with a needle that would activate when the button was pushed. It doesn't have to actually measure anything, I just want the needle to move in some way. i found a little voltmeter on sparkfun that I could probably repurpose, but it's 2x2 inches which is a little bigger than I wanted.  I'm looking for something about half that size. Does anyone know of anything that would fit the description, or a way I could fake it?

Topic by sasham43 5 years ago  |  last reply 5 years ago


Need help with adding batteries and a charging circuit/PCB to my project? Answered

Hello all willing to help. I am building a laptop/dock thing for my shield tablet. I need to add a charging circuit or PCB to make my project portable. I am working with this board for the LCD from an old laptop as well as a few lithium ion batteries. what I need is a circuit that can charge the batteries as well as deliver 12v to the LCD & 5v to the tablet. The board for the LCD came with power brick that outputs 12v 4a max( I also have the power brick for the laptop that I pulled the screen from). If more information is needed leave a comment I will reply as fast as I can. Thanks in advance for all the help

Question by kleinish 2 years ago  |  last reply 2 years ago


Need help figuring things out in a very simple circuit!!!

I have an AC motor rated at 120 Volts, 60 Hertz and 4.5 Amps. I've already tried connecting this motor straight to a wall outlet, and it works fine. The problem is, I want to control how fast it spins. So, I plan on using a variable resistor connected in series. However, I seem to have already burnt out a 20k variable resistor and I want to know whats going on before I try anything else. I have a 1M and a 2M resistor waiting to be tested but I'm unsure whether or not they will burn out like the 20k! The confusing part is I don't know how to calculate anything because I don't know how much current is coming out of the outlet!

Question by Ke-Bob 8 years ago  |  last reply 8 years ago


Can someone please help with a simple lighting circuit.?

I connected 7 NiMh batteries in series. I connected another set of 7 NiMh in series. Then, I connected the 2 sets together in parallel. A voltage check of the battery pack reads 9.4V. I want to build a miner style light out of it. I'd like to put the battery pack on a belt, and have a control box, also on the belt, with an on/off switch, a dimmer, and a battery recharging connection. I know how to solder and have a basic understanding of electricity. What type dimmer, bulb, etc. would be best? I'd like the light to be as bright as possible, without continually blowing bulbs. Something like this is what I had in mind, but I'm not sure what size/type components to use. Also, am I missing anything? http://i1114.photobucket.com/albums/k522/ALcoonslammer/lightcircuit.jpg

Question by coon_skinner 7 years ago  |  last reply 7 years ago


Plastic Soda Bottle Prosthesis

Prosthethic arms for land-mine victims, etc. War, land mines, and natural disasters create far too many amputees each year, especially in the developing world.  Worse, prosthetic limbs are expensive and hard to come by.  The Center for International Rehabilitation, posting under Instructables username CIRNetwork, has been working to find sustainable solutions:  locally available materials worked by local craftsmen.   Their plastic soda bottle prosthesis is one clear, simple solution to this problem:  a plastic bottle is heat-shrunk to cover a plaster cast of the limb stump.  Different devices can be attached to the end of the bottle, enabling the wearer to perform basic daily tasks.  This type of thing can really make a difference.  Check out the video below, and see more on the CIRNetwork YouTube channel. Want to help?  CIR is seeking donations of mobility aids to support ongoing rehabilitation relief efforts in Haiti.  You can also make general donations to assist people with disabilities worldwide. This post has been sponsored by Pepsi. The Pepsi Refresh Project celebrates the people, businesses, and non-profits with ideas that will have a positive effect on our world.

Topic by canida 9 years ago  |  last reply 8 years ago


What is a good cable/socket system for modular circuits?

I've been working on and off on an integrated color organ and vumeter over the past few months.  Part of the design is that there will be a central "hub" that will do all the filtering and user interfacing, allowing me to build the display itself separately.  The intent is that this will allow me more design freedom in a display, since I won't have to fit all the circuitry into it.  It's also cool, since this project is more self education than anything else.  The minor problem is that I have no idea what type of cable or connector to use in order to make the design modular. So, is there a good cable/socket type for this purpose?  It preferably needs at least five wires (high, low, mid, left channel, right channel), which is why I don't think USB is a possibility.  Also, will it be necessary for one of the wires to be hooked up to ground of the central hub?  My intent is for the display and hub to have different power supplies, with the filter outputs hooked up to transistors in the display, which will in turn "trigger" the leds. Forgive me if this is a glaringly obvious question; I'm entirely new to electronics, so I have no experience with cables and the like. edit: the display is going to be at least a foot from the central hub, if not more, so ribbon cables and the likes are out of the picture.

Question by Skidion 8 years ago  |  last reply 8 years ago


Help fitting a low voltage indicator into this circuit?

Hello,I know very little about circuits and electrical components, so please be kind.Attached is a picture of a simple circuit. "A" is a 4,5V AAA alkaline pack, "B" is a latching pushbutton switch and "C" is a nicrome wire.In the simplest and cheapest way possible, this circuit needs to alert the user if the battery pack goes below 3V. The indication signal needs to be a "beep", just like a 9V fire detector. (I can't have a LED signal).After some googling, I found that a 3V "low signal relay" could be one option. I prefer to use wires, and not a PCB in my circuit. My questions follow below:1. Is a low signal relay this the cheapest and simplest way, or are there others?2. What components do I need to achive the "beep" and where in the circuit do these components go?3. Will these components draw any power in standby mode, or do they only consume some power when the "beep" goes off? Because if they draw power continuously, I will need to add an extra (coin cell?) battery, as I need to save my alkaline pack for the nichrome wire. The extra battery shoud last for min 3 years.All help highly appreciated.Thanks!/Karolina

Question by karolina81 3 days ago  |  last reply 1 day ago


(newsletter) Hidden Compartment, Watermelon Keg, Ferret Wheelchair...

Sign-up for this newsletter: Welcome back! NEW CONTEST: Converse Back to School in Style Contest - Make or customize anything school-related and win a gift card so you can make your own Converse shoes!SINGER Kids Crafts Contest - Create something crafty with or for a kid and win a sweet new serger or sewing machine from SINGER!Forbes Teach Me Fast Contest - Make a 30-second how-to video and win an awesome Flip MinoHD video camera! Winning videos will be featured on Forbes.com.Gorilla Glue Cardboard Contest - Build anything using cardboard, and win a huge package of Gorilla Glue supplies and gear!Ends August 23: Low & Slow BBQ Contest - Cook up something tasty and win a Weber Smokey Mountain Cooker, and autographed copies of the new Low & Slow BBQ book! Bike Dog Walker The Wild Pig Smoker Make a Magnetic Fish Tank Cleaner Hidden Cabinet Behind Fake DVDs Make or customize anything school-related! FerretMobile: DIY Ferret Wheelchair Make a Resistor Reference Card Listen to Shortwave on an AM Radio Home Made Tonic Water Concentrate Share something cool quickly! Get crafty! Make a Sekkaboku Rubbing Crayon CIR Sand Casting System Air Pumped Patio Fireplace Homebrew Cold Smoke Generator Submit a cardboard creation and win a prize pack from Gorilla Glue! Cook up something tasty today! Ends August 23 Pulled Pork on a Weber Kettle Grill Smart Power Strip for Your PC Stone Tile Lamp Make a Watermelon Keg Sign-up for this newsletter:

Topic by fungus amungus 9 years ago


9kV 50mA tesla coil NST question. Why does the circuit breaker in my home trip when i plug in my NST?

Please someone help, this is my first tesla coil project, my setup: 230VAC 50Hz input ricci 9000v 50ma NST with a built in GFI (ground fault interrupter) but i bypassed the gfi succesfully .see pics safety gap  7,5 cm diameter pvc secondary 1000 turns #24 magnetwire (0,5mm) secondary 10 turns 8mm copper pipe primary (tapped at 7 turns) saltwater capacitor 16 green beer bottles in a bucket with a capacitance of 0,0122 uF or 12,2 nF (thegeekgroup bucket cap) static spark gap 28mm diameter stainless steel spheres as electrodes with oven fan (temporary, i am building a hyperbaric gap) 10cmx27,5cm aluminum toroid topload with a brass screw as breakout point RF ground aluminum rod 1,2 meter  When i tested the coil for the first time the spark gap was set on 6mm and i got 20cm or 8inch streamers without breakout point but the gfi on my nst tripped after a few seconds. i didn't know there was a built in gfi on my nst so i fooled around with my spark gap and safety gap and the tapping point on the primary hoping to get better performance. after a few runs the gfi started to trip very fast and i could only run the coil with the spark gap set on max 2mm, any bigger then that would trip the gfi on the nst. so i found out that it had a gfi and i bypassed it with thick wire. Then when i ran the nst i got the exact same thing but with my circuit breaker in my home. i have made a video on youtube that shows the problem here is the link: (please help) http://www.youtube.com/watch?v=piH44ohowyE please anyone help me! Any help or suggestion is very welkom!

Question by colinbarnes 6 years ago  |  last reply 2 years ago


Help with adding LED's and mini fan to existing circuit.

Hello, and thank you in advanced for taking the time to read through this and give me feed back. I greatly appreciate it. So I have a working circuit that is running off a 3 prong 120 V AC 10 amp power supply. I thought i would pretty it up by adding a led lit power switch and another plane led in a different spot, and make it a bit more reliable by adding a fan on the inside of the enclosure. I downloaded and app that calculated how much Resistance I need from the power supply to each led and fan (all in parallel). After i hooked everything up to what i thought would be an easy mod. to my surprise I smoked the resistors in under 60 seconds.   I talked to a friend who gave me some basic direction but couldn't give me technical stats. He said i needed to start with a transformer (i believe is the term he used) to drop the voltage, then to go to a bridge rectifier to turn the AC current into DC, then after that i would need a current regulating switch to give the proper supply for the LED's and Fan. Then from there he said i would be able to calculate the Resistance needed for each Led and fan and would be able to hook up the resistors needed with out damaging them. If this is the correct steps to take I can understand that; however, he was not able to give me any technical info on any of these components and what i would require. If these steps are correct, what i need help with is to determine what specs i would need for each piece, Including the resistors after the current regulating switch. (Technical Info) The 1st LED im using is a Switch that lights up when on and has leads just for the LED (the switch is already being used and works). I could only find the style i wanted from an automotive shop so it says for the led 12V only(unfortunately i couldn't find specs on the amperage the LED takes, but the switch itself is rated at 5amps). The second Led is a basic Green Led that i Purchased from radio shack, It is 2.1 V and runs on 30 MA, The fan im using is from an old game console and is 5V and runs on 80MA. Thank you for any and all help you give, this went from what i thought was an easy stylish mod to me ripping my hair out and scouring the internet for info, i finally gave up and decided to join this great community to ask for help with my specif conditions. Thanks Instructable Fam.!

Topic by 3CEnterprises 4 years ago  |  last reply 4 years ago