We have a coil wound over a non-conductive tube which is the coilgun`s barrel, of course. It has to be non conductive (plastic or something comparable) because otherwise the coil`s magnetic field would simply cancel out itself inside the tube. The projectile has to be made of a ferro magnetic material, that means stuff that reacts to magnetic fields. If a short current pulse is
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passed through the coil via our charged capacitor and the switch, the projectile will be pulled into the coil. If the pulse ends before the projectile gets to the coil`s middle, it`ll leave with a gain in velocity. The main difficulties with coilguns are winding an appropriate coil, finding the appropriate voltage and capacity and of course timing and positioning of the projectile. The more windings a coil has, the stronger is its magnetic field. But if you use too long and thin wire with your coilgun, either the wire will eventually burn through or the coil`s electric resistance will go up and lower the current and thus weaken the magnetic field. Further increasing of the velocity is possible by adding more stages which means not more than adding more coils. These coils need to be triggered automatically since the projectile is already in motion and you`re not able to push the button at the right moment. Many people use light barriers mounted in front of the second stage. Here`s a schematic of my second stage light barrier trigger (Ignore the safety switchtes and safety lights): You can see the second stage, a light barrier in front of it and a little screw which gets pushed (normally it would fly through by itself due to the first stage) into the beam. I built this two staged test rig with multiple measurment devices in order to learn more about positioning of the projectile in front of the coil, the coil itself,...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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