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I previously worked on Virtual Reality and other hardware at Valve.  I currently work at Google[x].

Prior to starting at Valve, I built computer peripherals such as keyboards, mice, and joysticks that were designed to be used inside MRI machines.  My company, Mag Design and Engineering, sold these devices directly to researchers at academic institutions who used them to publish scientific papers in peer-reviewed journals.

After work, I spend time on many different types of projects that usually involve circuit design, machining, material selection, and general fabrication/hacking.  My favorite place to be is my home workshop.

ben dot krasnow at gmail




Thursday, April 10, 2014

Electron beam control in a scanning electron microscope

I describe electron beam optics and deflection as they are employed in scanning electron microscopy.

http://web.jfet.org/vclk/ - Deflection amplifier

http://www.johngineer.com/blog/?p=648 - CRT Christmas tree

http://www.fei.com/ - FEI Company


  1. I've got an electron microscope gun and lens assembly. The filiment is busted, but if you would like to bust open the assembly and tinker some time I would love to make a road trip out of it!

  2. I've also got the sample chamber. I am gutting the chamber to use as a vacuum chamber, so the plate that controls x,y,x,r,o is all yours if you want it

  3. Hey guys, love the electron microscope.I've only been tinkering with electronics for 3-4 of year and I want to make one so bad, don't think I'm skilled yet to make one. Maybe one day I will get started I'm only 16 so got lots of time.