Cutting-edge diy projects 

Facebook Twitter Flickr LinkedIn YouTube RSS
Home 2012 February
formats

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:

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
No Comments  comments 
formats

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.

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
No Comments  comments 
formats

Posted to diyPhysics.com: d.i.y. 10 MHz Atomic Clock Frequency Standard Using Surplus Rubidium Oscillator

I just posted on www.diyPhysics.com  about my 10 MHz rubidium standard based on a surplus Efratom M-100.  It is a free-standing 10 MHz +/-5×10-11 frequency standard for frequency counters, as well as a precise calibration source. I use it to keep precise track of frequency when working on Earth-Moon-Earth (EME) communications, where even tiny errors in tuning

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
No Comments  comments 
formats

SharkVision – A Sensing Suit for the Blind by Hannah Prutchi

SharkVision – A Sensing Suit for the Blind Hannah Prutchi, 8th Grade, Science, VMS, October 2011 Blind people often use canes to avoid obstacles when walking. But, these are intrusive, can only detect obstacles where they are pointed, and could be dangerous to other people.  I devised the “SharkVision Suit” to help blind people move

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
11 Comments  comments 
formats

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

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
No Comments  comments 
formats

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.

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
No Comments  comments 
formats

Superbowl Sunday at the Prutchi Residence

From Saturday Morning B

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
No Comments  comments 
formats

d.i.y. CO2 Laser Power Meter

In my prior post I told about components in my CO2 laser’s RF power supply becoming unsoldered when they overheated.  After the repair, I needed some way of  retuning the RF output stage for maximum laser output.  This motivated me to build the power sensor shown in the picture above.

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
2 Comments  comments 
formats

CO2 Laser Engraver/Cutter Addition to a CNC-Retrofitted Sieg X2 Mini Mill

I was thinking about buying a laser engraver/cutter for home, but after retrofitting for CNC the Micro-Mark mini mill that my wife gave me for my birthday, I figured that I could simply add a CO2 laser to the X2 mini mill. Before describing the mod, I figured you would want to see some results. 

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
18 Comments  comments 
formats

Home-Made Radiac Turns Surplus Military Scintillation Probes into Sensitive, General-Purpose Gamma Radiation Counter

Military-surplus scintillation probes meant for the detection of plutonium contamination are widely available in the surplus market.  The DT590A/PDR-56F “Plutonium-239 Contamination X-Ray Probe” was used with the PDR-56 Radiac Set (radiation detection and measurement instrument), that has been obsoleted by the US Air Force. The probe is designed specifically for detecting the 14 to 21

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
No Comments  comments