timer = millis() - startTimer; Once again I'm providing the schematic and it is really simple. This, when triggered, would produce an intense magnetic field for a brief period, similar to a coil gun (see this article for more info). I didn’t have any small heatsinks sitting around. } Twisted Pair in my Hair has updated the project titled Parametric Electronics Enclosure. Pry a new or used disposable camera apart with a screwdriver. The EM-15 coil gun design can be used as a starting point for more advanced experimentation. When firing, the coil of wire induces an intense magnetic field that draws the ⦠Far more than the battery pack or the electronics can supply. Step 1 â Preparing the coils (DIY make coil gun without camera) Making the coils for the coil gun. I use the flash circuit harvested from an old disposable camera as the basis for a handheld coil gun. You can really modify with any sort of housing that works for you like a flashlight casing or other things. To fire again you need to reset the Arduino. I used a photoflash charger to charge a bank of capacitors rated for 350v, 880 uF. Yeah, I was baffled as to why he would have used such a high Vgs…or how he would have even found such a part. If you make the railgun rails magnetic you don’t need that much current. the system stops and if it successfully shot projectile it also stops. Just make sure it can handle the current. http://hackaday.com/2015/11/09/the-most-powerful-diy-railgun/, Very cool magnetic gun. Instead of one or three coils, you need dozens of low-impedance coils that are switched rapidly in a wave sequence over distance to give the projectile some time to accelerate – a linear motor instead of a single impulse. Then it waits for 2 seconds. I'll look if I can perhaps find something online. this is project How-ToDo, my name is Konstantin and today I ⦠digitalWrite(7,LOW); What is the initial triggering device? You don't need it but it's quite convenient. That way I can avoid the comparator altogether. A coilgun, also known as a Gauss rifle, is a type of mass driver consisting of one or more coils used as electromagnets in the configuration of a linear motor that accelerate a ferromagnetic or conducting projectile to high velocity. And full info that how to place that part correctly . Volt Booste⦠Now only the forward voltage of the diode and the voltage drop across the internal resistance of the coil are the total voltage, resulting in a slow decay. I am wondering why this configuration is desirable rather than, for example, using all 10 capacitors in parallel. Let alone the response of the slow photo detector.. Have you made a calculation of your C program and other delays for determining the actual top projectile speed ?? A small capacitor, of similar size as the used LiPo batteries should outperform the batteries in delivered peak energy. The capacitor used was chosen for improved efficiency over the ceramic capacitors used in the original Plasma Gun. Materials used in making coil gun: 1) Coated magnet wire 2) PVC pipe 3) 400V full bridge rectifier 4) 100 W incandescent bulb 5) Multimeter 6) Capacitors 400 V, 3300uF. The first thing that needs to be made are the coils. 26 Comments . Feel free to use the phrase :) . It would turn the electromagnet on and off really quickly, which makes those capacitors perfect for a coil gun. 2 years ago Learn how your comment data is processed. The current decay depends on the voltage across the inductor, since U = L * dI/dt. SimonAllen wrote a comment on Neopixel LED Skirt. Does the Amp hours or the cell count matter? I cannot seem to find anything anywhere. Be sure to check out the video I made. This is a probelem even for the LiPO pack, so you need a different type of capacitor that can tolerate hundreds of volts and has a very low ESR, which means you have to use capacitors the size of soda cans to get any performance out of a coilgun. Since we need 20V to trigger our MOSFET we'll use comparator to take 5V signal from Arduino and turn it to 20V. Would use 2400mAh, 130 peak C lipo, And an STM32⦠with many outputs, coupled to IR diodes and fiber optic cables to switch the FETs via IR diode – transistor. Coilgun Without Massive Capacitors: Coilgun is like a slingshot from the future. I read them all :). I'd suggest using Li-po batteries. B.B liked ESP32 Tiny Basic with VGA output and PS2 keyboard. ⦠void loop(){ Though what made me LOL was the mounting the MOSFETS directly to the wood: Wooden heatsink, wooden cool down. Are the capacitor really a problem? A simple EMP consists of a capacitor, transformer, trigger, and coil of copper wire. Even if you are using perfboard or PCB make sure to tin the tracks as even a thick track might not handle the current or act as a resistor. } 2 years ago. August 16, 2017. Making A Coil Gun Without Giant Caps. My design powers coils directly from batteries and yes I mean coils since you can add as many as you want to make it more or less powerful. I’ll have to consider this as well. The code doesn't do much. I have a working coil gun, but i fried the circuit that charges my cap that i took out of a disposable camera. But it still does involve high voltage and high power so it should be done ⦠A wholly different approach is needed to get an effective coilgun running directly off of batteries. Åenol wrote a reply on Brushless Actuator (Arduino-Compatible). The Coil Gun: Concept. In the datasheet it doesn't even show characteristics for above 15V. If you have any questions or suggestions leave them n the comments. Suppose two flat metal plates are placed close to each other (but not touching) and are connected to a battery through a switch. I'd suggest checking the update schematic on https://www.instructables.com/id/Coilgun-1/. Improvements can be made to the charging circuit, capacitor bank, accelerator coil, and barrel design to achieve higher velocities. Most hobbyist coilguns have an efficiency of 1-2%. If no projectile is detected within a second. I've tried to make it fairly safe in that it won't fire the projectiles with too much power as long as you charge the capacitors to only around 100 volts. Hey, A while back I decide to make a coil gun. Which basically turns the coil on for one second and then turns off the MOSFET was just warm to the touch while the coil was melting the plastic tube. For a faster decay, you should place a resistor or zener diode in series with the flyback diode, such that you nearly but not quite reach the MOSFETs maximum drain to source voltage. For the battery I suggest soldering XT60 connector directly to you board. Think it’d help? When triggered, the Arduino Nano activates a pair of IRF3205 MOSFETS with logic signals stepped up to 20V, shooting lengths of 7mm or 8mm steel rod. Very intreseted .. can't wait to see part 2! This one can be on bread board with a problem. Each of those options will result in a much larger voltage across the coil when it’s turned off, and therefor a much faster current decay. With the 1300mAh battery you can only draw 58,5A which is not enough. I believe you need to invert the current, transform it then ⦠In ⦠How can i make on of those myself? There’s probably some maths involved but trial and error would be good enough. These are some of the materials and tools you'll need. Learn more, Friday Hack Chat: Graphical Programming Languages With Boian Mitov, http://hackaday.com/2015/11/09/the-most-powerful-diy-railgun/, Practical Sensors: The Many Ways We Measure Heat Electronically, NASA Selects SpaceX To Launch Lunar Gateway, Trouble With The Texas Power Grid As Cold Weather Boosts Demand, Knocks Out Generators, BASIC: Cross-Platform Software Hacking Then And Now, Hackaday Podcast 106: Connector Kerfuffle, Tuning Fork Time, Spinach Contact Prints, And Tesla’s Permanent Memory, This Week In Security: ISNs, Patch Tuesday, And Clubhouse, James West Began 40 Years At Bell Labs With World-Changing Microphone Tech, Vintage Calculator Design Shows Just How Much We Take For Granted Today, Homebrew Doorknob Caps For High-Voltage Fun, It’s Noodles All The Way Down: Ramen Comes To 3D Printer Support, A Look At The “Risky” Tech In NASA’s Martian Helicopter, This Slimline Word Clock Uses Laser Etching To Keep Things Simple. void setup(){ pinMode(13,OUTPUT); The capacitor loses its charge, the spark gap stops conducting and it all starts again with the camera circuit charging the capacitor. pinMode(7,OUTPUT); After that, take the insulation tape and wrap around the pipe from a distance of 1-2 inches from its end. I'm using 6 cells and if you've seen the video it does some damage but it isn't anything spectacular. That way you can pull on the wire really hard and as you twisting the tube the wire should sit exactly in the ridges. Coilgun is like a slingshot from the future. marazm liked Laser Projected Asteroids on the ESP32. With more cells you could do more. Take the PVC pipe and cut it , to get a length of 30-40cm. digitalWrite(8,LOW); The Arduino Nano is powered separately by a USB cable using either power bank or wall adapter. My coil is 70 feet of 26 AWG wire wound on a plastic drinking straw. Add more current and you get diminishing returns, and your efficiency drops down to 0.1%. Many coil gun and rail gun builds have made it to our pages over the years, including his ridiculously powerful gun that uses a capacitor bank so large it needs its own car. IRF3205 to be exact. Refer to the schematic when soldering. In any case, you can apply much higher field densities without so much loss, yet you don’t need it to be that high because you’re not trying to achieve a huge single impulse, so you achieve much more for much less. We can detect light coming from the LED with the photo transistor and whenever a projectile blocks the light we know it's position. They can fire a magnet with a fair bit of a ping. You measure the moment the projectile is at whichever point, and use that to decide when to energise the next coil. The other 3000mAh battery can supply 120A which is a lot safer and the battery will also last longer. It can supply this current because its own series resistance is much lower than that of the battery stack. A capacitor is an electrical device that has, in DC circuits, the purpose of storing energy. Apart from the power cable there are sensors connected to A0 and A1 pin. That sounds really inefficent since you want peak field strength between the rails. The MOSFET can handle 110A continuously and 390A as pulse current so that isn't going to be a problem. Whenever we see a coil gun project on the Internet, it seems to involve a bank of huge capacitors. I Just want to go over couple of this I haven't mentioned yet. i kinda got confused a bit at the comperator whether the MOSFET on it (Q1) is the Mosfet of the driving coils and how they should be connected together, "The brain of this project - except for me, of course - in an arduino nano[...]" I hope you won't be mad at me, if I'll steal this phrase, it's just too good :D. I need to add the MAXIMUM gate source voltage is ±20V, the maximum drive level I'm aiming for is about 16V, to keep a bit of a safety margin. Many coil gun and rail gun builds have made it to our pages over the years, including his ridiculously powerful gun that uses a capacitor bank so large it needs its own car. timer = millis() - startTimer; long timer= 0; while(analogRead(A1) > 50 && timer < 1000){ Press down on the tabs with the end of a screwdriver, pulling the case apart while theyâre loose. [miroslavus] took a different approach with his gun–he wanted his project to be built without those monster caps. This project like many others is using Arduino even if it might not be necessary. Great suggestions. }. You can also find eagle files if you want to play with it. Question In almost all coilgun configurations, the coils and the gun barrel are arranged on a common ⦠Iâve managed to get a one stage coil gun working off of a capacitor, but I think the way you do it (with a constant flow of electricity that is turned off by an infrared sensor) is a better alternative. Share it with us! Hence why, even as some super/ultracapacitor might outperform the battery in theory, its voltage is simpy too low. PVC Pipe â 1 inch by 8 inches in diameter will work great for this project. Worse still, the projectile gets permanently magnetized and you lose energy into re-arranging the domains. 8mm or 7mm steel rod. Thank you! I would like to build a coil gun and have it run off capacitors of my own make but i'm wondering what i should make them out of and what medium i should use like maybe a salt water lemon juice mix or some acid or alkaline solution or a oil I'd prefer vacuum from what I've researched but i have no idea how to make a ⦠It does. 2 years ago. Question (Comment Policy). Hi Mehdi, Iâm a high school student competing in a science fair, and you inspired me to build a coil gun for my project. How big is a 1400 mega-annus henry battery? Its 46 mm long. You know those permanent magnet guns? A linear motor in contrast has a copper or aluminium slug as a projectile, and it works by inducing an eddy current into it, which in theory has no limit except proximity and skin effects that apply at high currents and switching speeds. Depending on the mass you're accelerating, it may be a better idea to use more coils or more turns per coil and a constant current source rather than a capacitor. Even when fired without projectile. I liked his video editing, as for the rest of it…. The time it takes is not relevant for the function of your coil gun. minto k zacheriah. Wrap the insulation tape above the pipe in succession until it reaches a thickness of 4-5 mm. A working model of a electromagnetic mass accelerator (mobile test bench) in HD quality. A coil gun, which is a type of EML, can propel a projectile without any mechanical friction so that there is no theoretical limit to the velocity. I'll have to lower that down. I guess the fets didn’t run long enough to heat up. An electromagnetic launcher (EML) is a device used to propel and accelerate a projectile by converting electrical energy into kinetic energy. It just make building it easier. But they don’t really get hot. It is generally accepted that the implementation of this design is very difficult because of the low efficiency and low reliability. Favourite answer. I’ll try out few methods. And although we can't possibly turn something on and off fast enough to make it efficient, flash camera capacitors release a lot of energy in a short amount of time. When you trigger the coil gun, the capacitator is discharged very quickly at a very high current. My design powers coils directly from batteries and yes I mea⦠Once you finish all 6 layers you can drill another hole for the wire and tie this and around the pole to keep it in place. I am designing a coil gun using a schematic that specifies a capacitor bank of 10 1500uF capacitors in a 2x5 arrangement to provide an effective 600uF at 1000V. I like the adjustable delay for switching the MOSFET but it’s going to be pain in the butt with 6 coils. Nevertheless, this opinion is mistaken - modern technological the base has long been able to realize an electromagnetic mass accelerator with an acceptable efficiency and high reliability I am looking for interested in making. The high voltage coil then puts out a very high voltage spark on the other side. Thanks in advance! The big difference would be a coil gun vs a rail gun, the rail gun using the voltage between two rails being shorted by the projectile creating a magnetic field out of the projectile while heating (and melting) projectile. Looks like a datasheet reading misunderstanding – the 20v he read is for the absolute maximum gate voltage (not the trigger level), the Vgs(threshold) is marked as 2 to 4v (okay, for a low Vds but it should be low as FETs have low resistance). digitalWrite(7,LOW); I wonder how much time it actually takes for the magnetic field to collapse when teh coil is switched off. Nothing special except for the 3D printer but It not actually necessary. Plus, you get much higher efficiency out of a linear motor than you do out of a pulsed coil. I need to make a circuit which can increase input voltage of about 12V to 300-400V. This site uses Akismet to reduce spam. It is explained in the video quite well at 4:20 :D. To toggle the coils we'll using MOSFETs. Again first coil being 7 and second being 8. A coil gun in its basic form consists of a launch coil, a high-voltag⦠The bright side of doing this, if it fails as coil gun it still can be useful as linear drive…, Please be kind and respectful to help make the comments section excellent. Steps for making coil gun: 1) How to prepare coils: Cut the PVC pipe at 6 cm length. You'll need step up converter to create these 20V. Voltage. Coils for the Coil Gun. Otherwise it's a nice design and I'll be patiently waiting for part 2 :). Note that PE is proportional to voltage-squared, so it is a great advantage to use higher voltages. The simpler the better. You can of course just connect step down converter to the battery and get 5V but I didn't bother. This does simplify the electronics since no capacitor charging circuit is needed. long startTimer = millis(); digitalWrite(7,HIGH); https://youtu.be/AcJeElCUq1w You can buy what I did, Do you have a complete diagram of all the components together ? I'm using XL6009 which is a really cheap one but also a bit bulky. Capacitor. Let's start with the voltage. The only real limitation is the battery. I got them from hobbyking.com They have a ton of batteries. } The Coil Gun The gun itself is many turns of thick copper wire around a small tube. That is what I was thinking about, got 6mm ID 0.5m carbon tube, many IRF3205, 10 rolls of 0.1mm wire to make Litzt wire, coil should have 30-50 turn only 7mm long but 40-48 pieces, current aimed 200A-300A 20V. Lv 4. I starts and sets up which pin is output and input. When the projectile leaves the coil and triggers the photo transistor it may already be too late and the projectile will be slowed down by the magnetic field that is still present. First read your comment as “mega-anus”, which would be even more hard to quantify. Did you make this project? Are the coils always on until the optical sensor on the other side is tripped? You've probably heard of these before, and their devastating effects on electronics. The gun isn’t exactly creating plasma discharges with its launches, but it’s a fascinating project nonetheless. If you have the 3D model I provided you also have a convenient place to mount the sensor. Reply How to make a coil gun. how much current can it handle? So far, I've built a simple single stage prototype. Next, take the copper wire, and after leaving some slack at the beginning, start wrapping it around the pipe. 3 years ago, I utviklingen av ideene til Christian Birkland elektromagnetisk masseakselerator https://youtu.be/admghPNkotI A working model of a electromagnetic mass accelerator https://youtu.be/9YQyjPITDho (mobile test bench)https://youtu.be/Sm1rZ-ZeHlc in HD quality https://youtu.be/M6CUHnvI2Ek You can buy what I didhttps://youtu.be/nCgz02bR058https://youtu.be/FFBHuCnkUzUIn the video, the functioning of the working model of the electromagnetic mass accelerator (mobile test stand). You don't even have to use 6 cell battery. I will make a coil gun with only one coil, because it's extremely simple compere to device with few coils, you need to synchronize all coils, use some kind of sensors to detect position of the bullet, also multi-stage device simply would not fit in the form factor of the pistol, even now body is completely filled. If you have the 3D model there is a hole where you guide the wire in and and twist it around the pole. You're right the gate to source voltage is too high. Lastly the coils or rather the comparators are connected to digital pin7 and 8. Thanks for the feedback. Must contain a lot of iron so it is ferromagnetic. I wired everything just hanging in the air since it's only couple of resistors. How do you determine the value of the pull down resistor? All that will happen about 20 times a second. hwhardsoft has updated the project titled Arduino M-Bus Shield. delay(2000); Since this will be handling high current I recommend using perfboard or some PCB. Mechanically and electrically it works but I'll be making 3D printed enclosure and sorting out every details of the gun so if you want to see that subscribe to my YouTube channel as it'll there the soonest. Remove the paper layer from the disposable camera and locate the tabs on the bottom and sides of the casing. plastic tube. digitalWrite(8,LOW); However, if you did the same thing over a 20″ linear motor, you’d have ten times more time to accelerate and your peak power drops to 1 kW which is perfectly doable with a small LiPo pack. I mean shooting stuff. There are several important factors in choosing an energy storage capacitor for a coilgun. by: John Baichtal. I would suggest using one but make sure you use separate heat sink for each MOSFET otherwise you'll be switching all coils at once. Consider that a pellet gun will have a muzzle energy of about 10 J. Let’s further suppose you want to reach some appreciable speed, like 100 m/s so it’s better than just throwing a rock. After all we are making a coilgun. while(analogRead(A0) > 50 && timer < 1000){ First coil being A0 and second A1. In particular, it stores an electrical charge. Using capacitors may not be the best idea if you are looking to make an efficient gun. 10mm outer diameter and 8mm inner dia.
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