- 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
Friday, June 24, 2011
Common digital output IR thermometer sensor:
TPS334 sensor datasheet:
Analog Devices app note regarding thermopile sensors:
Servo pan/tilt IR imaging scanner project:
Redshift thermal imaging:
Sunday, June 19, 2011
I started using an Audio Technica ATR-3350, which is only $20 or $30 new, and the mic is OK, but has very little high-frequency response. This can be corrected with equalizer settings in post-production fairly well. I recently upgraded to a Sony ECM-55B, which sounds better, but I am not sure it was worth the expense. I was really expecting the mic to have a much higher output level than the ATR-3350, thus allowing me to turn down the gain on my recorder and have a much lower noise floor. As it happens, the mic requires even more gain than the ATR-3350. Overall, I am pretty satisfied with my sound recording setup -- the only addition I might make is a low-noise preamp to try boosting the lavalier mic signal while adding less noise than the H4 adds during the high pre-amp gain stage.
This is the second video of a short series in which I discuss the basics of electrical impedance from a practical standpoint. In this video, I explain the importance of knowing the magnitude and angle of impedance, as well as how this affects the power factor of a given electrical circuit.
Wednesday, June 8, 2011
In this video, I show how a simple LED power supply circuit can be made more efficient by replacing a resistor with a capacitor. I describe the difference between resistance, reactance, and impedance.
Saturday, June 4, 2011
Also, if you haven't been able to attend Maker Faire yet, it really is as amazing and epic as you have heard. The intelligent and inspiring people who make it happen are a large part of the motivation that I had to build and display this microscope. In turn, I hope my project inspires others to create things and share their ideas with everyone. There's no better way to have fun and celebrate accomplishment at the same time!