About This Site

Electromagnetic Links

Here are some Web resources I found useful while researching these projects. Please tell me if any links are broken! Also let me know if you know of anything additional that might be useful.

More Links



Gun Safety

Discussion Areas

  • .HV Community has active discussions of high voltage and linear accelerator topics. This is where I hang out.
  • eFusion Consortium is a top-notch marketing and communications company in which I'm involved.


  • EasyEDA offers free online tools for electronic circuit design and circuit simulation using Spice and PCB design and Gerber tools. Also offers great prices on custom PCB manufacturing.
  • PCBWeb is a free CAD application for designing and manufacturing electronics hardware.
  • MWS Wire provides all kinds of magnet wire, and has personally contacted me to say they are eager to sell small lots to hobbyists like us!
  • WireTron manufactures wires for electromagnets and other applications. They offer a handy piece of free software to help understand and choose magnet wire. Get it!
  • The general-purpose 2N2222 (or the plastic-case MPS2222, as Motorola produces it) is spec'd on the Fairchild site at: http://www.fairchildsemi.com/ds/PN/PN2222A.pdf
  • Capacitor Testing and Safe Discharging by Samuel M. Goldwasser has a great deal of practical information about capacitors.
  • Tribology: Rtec Instruments specializes in design and manufacturing of high tech instruments such as tribometers, 3d profilometer, stress tester and atomic force microscope etc.

Finite-Element Analysis Programs

  • FEMM is a free package provided by Dr. David Meeker, and is an excellent choice for coilgun modelling.
  • The FEMM Tutorial by David Meeker (based on Ian Stokes-Rees tutorial) is an essential introduction to using FEMM.
  • QuickField by Tera Analysis does magnetic field plots for user-defined configurations. Highly graphical and relatively easy to set up 3d configurations. The student edition is a free 3MB download but the limit of 200 nodes will prevent you from solving real problems.
  • Solenoid Physlet is a Java applet for a novel visualization of the magnetic field around a solenoid. This is part of the Web Physics pages by Davidson College.
  • Field Precision creates 2D and 3D finite-element programs for electrostatics, magnet design, thermal transport, charged-particle devices, electromagnetic analysis and radiation transport in materials. The programs are moderately priced for consultants, universities and small companies.

Inductance Formulas

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