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Home Which Prutchi Archive for category "David" (Page 2)
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Abigail’s Whimsical Sand Pendulum

On a recent trip to Israel, Abigail (10) saw a very pretty, large, and expensive sand pendulum.  In it, the pendulum was able to swing, while at the same time, the sand pan was able to rotate freely.  We applied our motto “Why buy it if we can MAKE it!”.

 
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Maggi “Cook Studio” in Leipzig: Delicious Home-Cooked Meals from Ready-Made Packages – A Culinary Oxymoron?

Growing up in Ecuador, Maggi Sauce was always available at our table, and Maggi bouillon cubes were part of many of our cook’s recipes.  On the odd Sunday that we didn’t have lunch out, my mom would prepare a Maggi soup (usually cream of mushroom or asparagus, being my father’s and my favorite), and there

 
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A Lesson in State Paranoia: The Stasi Museum in Leipzig, Germany

2 Weeks ago I visited one of our patients in Germany.  The hospital was close to Leipzig, and I had a few hours to stroll through town.  I went to the Museum in der Runde Ecke, which documents the power and banality of the  former district headquarters of the East German State Security Service or “Stasi” in

 
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d.i.y. Combined L-Band (23 cm) Helical Feed and Ku 0.4 dB LNBF for 120 cm Dish

The high-gain antenna on my space communications array is based on a Fortec Star 120 cm dish.  This is a high-quality, large dish designed for motorized FTA reception of analog, digital, and high-definition programs on Ku band satellites.  I built a feed that combines a KU band horn for free-to-air (FTA) satellite reception with a helical feed

 
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d.i.y. Gyroscopic Camera Stabilizer that Really Works!

One of my current work-related projects required me to buy some gyroscopes for prototyping.  I purchased some of the beautiful, motor-driven demonstration gyros made by Glenn Turner at www.gyroscope.com. Also as part of the project, I came across the professional-grade (and professionally priced, starting at $1,600) gyroscopic camera stabilizers made by Kenyon Laboratories.  These devices

 
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New Radiation-Detection-Related Posts at www.diyPhysics.com

I just published three scintillation-probe related posts at www.diyPhysics.com. First is on the construction of a very simple low-pass filter to interface commercial PMT amplifiers/scintillation processors to the PRA (“Pulse Recorder and Analyser”) software MCA:

 
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Posted to diyPhysics.com: d.i.y. GPS-Disciplined 10 MHz Standard + UTC Clock

Last week I posted detailed construction information for my rubidium atomic clock frequency reference.  Besides that unit, I also built a GPS-disciplined 10 MHz oscillator to serve as a secondary frequency reference, as well as a source of GPS NMEA data for my ham shack instruments that can use precise location and real-time-clock data (e.g.

 
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Posted to www.diyPhysics.com:d.i.y. 250 kV High Voltage DC Power Supply with Neat Trick for Switching Polarity

I just posted at www.diyPhysics.com detailed instructions on the construction of a 250 kV DC high-voltage power supply.  Although my hack for switching the polarity (referenced to ground) is simple, I am very surprised that I’ve never seen it elsewhere! The hack consists of adding one more capacitor to the Cockroft-Walton multiplier so that it can

 
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CNC Conversion of Sherline 2000 Driven by Mach3

Published on February 8, 2012 by in CNC, David

In my dayjob as an implantable-device engineer, I often need to prototype small parts.  So, after the successful modification of my home X2 mini mill to CNC, I decided to do the same to the Sherline precision micro mill that I have at work.

 
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Superbowl Sunday at the Prutchi Residence

From Saturday Morning B

 
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