About Me

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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




Monday, January 26, 2015

Covert radio pen with bone conduction speaker

https://www.patreon.com/AppliedScience ---- Donate here!
I built a tiny radio into a ballpoint pen that allows the user to hear audio by casually biting the pen.

Sunday, January 11, 2015

How a horn amplifies sound (hint: Impedance matching)

A horn-shaped speaker is louder than an equivalent speaker without the horn.  This fact doesn't violate physics because the horn is acting as a matching device between the speaker and the air around it.

Photo Credit for phonograph: Norman Bruderhofer,  Collection of John Lampert-Hopkins

Monday, December 15, 2014

Chocolate gun dispenses edible molten chocolate

I modified a standard hot glue gun to dispense molten semi-sweet chocolate. This is great for decorations and gingerbread houses.

Monday, December 8, 2014

Obeying the law (of physics)! Kinetic energy and momentum explained

In my video on the Crookes Radiometer, I showed that the devices spins because of a thermal gas effect -- not the force of photons hitting the vanes.  In the comments section, someone asked about kinetic energy and how incoming photons impart force to the rotor.  This video is a more complete answer to that question.

Monday, December 1, 2014

Encode information in fire!

A burning strip of carefully cut flash paper can encode information, which is then read by an optical sensor.  I'd like to determine if it's possible to perform computations with nothing but flash paper -- using the shape of the paper as data and program, and the flame as the readout.

Hamamatsu S7815 photodiode -- might be discontinued:

Harvard Infofuse project:

Source for flash paper and flash cotton:

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