Coil Gun [Part 3] – Testing the Boost Converter

I thought I would post a quick test I made of the boost converter circuit. In the video below, I’m charging the capacitor to a voltage of 200V. The charging takes about three seconds to go from the 15.8V (the initial voltage of the battery) to 200V, which is right within the ballpark of the simulations! … More Coil Gun [Part 3] – Testing the Boost Converter

Coil Gun [Part 2] – Theory, Design and Simulation of the Charging Circuit

WARNING: This circuit can produces voltages that can cause serious electrical burns or easily kill you if not handled properly. Please do some research before beginning this project to ensure you are taking all proper safety precautions when working with high voltage. If you are at a beginner level, I strongly encourage you to start with … More Coil Gun [Part 2] – Theory, Design and Simulation of the Charging Circuit

Coil Gun [Part 1] – Theory and Proof of Concept

I would venture a guess that 95% of all electrical engineers find their way into the field by trying to build a coil gun as a kid. In some way, it speaks to every boy’s innate desire to put their life in danger. The definite possibilities for electrocution and spontaneous fire have resulted in dozens of Instructables … More Coil Gun [Part 1] – Theory and Proof of Concept

Assembly and Testing of the SMD-EMG Amplifier

I finally got around to assembling and testing the EMG amplifier circuit boards. After fixing a design mistake with the board, I was able to get solid readings out of all four boards. The design mistake was a fairly obscure one, but provided me with a valuable learning experience. Schematic and Layout For the amplifier components, I used a … More Assembly and Testing of the SMD-EMG Amplifier

Current Sensing

Introduction While working on the magnetic levitation project, I came across the problem of needing to measuring the current through the electromagnet so I could feed it back into the control system. The techniques here will apply to a wide variety of applications. The idea behind current sensing is very simple. I will use the … More Current Sensing

Control anything using your muscles – How to build an EMG amplifier

Attention: I have since improved upon this circuit. Version 2 is covered here. Introduction If you are a Star Wars fan like me, you probably wish that the Force was real so you could manipulate objects without touching them. What if I told you that the Force actually did exist and you had the ability to control … More Control anything using your muscles – How to build an EMG amplifier