Cutting-edge diy projects 

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Superbowl Sunday at the Prutchi Residence

From Saturday Morning B

 
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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.

 
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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. 

 
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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

 
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d.i.y. Handheld Multichannel Analyzer (MCA) based on 16F877 PIC Microcontroller and LCD

Some time ago I was developing a medical instrument which required histogramming, which got me in the mood to retake my own PIC MCA project(http://home.comcast.net/~prutchi/index_files/scint.htm ).   I used the variable RAM in the microcontroller (16F877), so I limited the number of channels to 95 and let the histogram run until some channel reaches 240 counts

 
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We Received The First Copies of Our d.i.y. Quantum Physics Book!

Today we received the first two copies of our new book! It is a do-it-yourself book on Experimental Quantum Physics, and was published by John Wiley & Sons. From the back cover: “Build an intuitive understanding of the principles behind quantum mechanics through practical construction and replication of original experiments. With easy-to-acquire, low-cost materials and

 
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d.i.y. Moon Camera for EME and Radio-Astronomy Mounted on Space Communications Antenna Array

Our space-communicationsantenna  array includes a camera that looks in the direction that the array is pointing.  This camera helps us check that we are aiming directly at the moon during EME attempts.  In addition, when it lets us see airplanes that may be the source of interfering signals when we conduct radio-astronomy observations.

 
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Crazy Pacemaker Hack: d.i.y. High-Speed Photography

This is a hack that combines three of my favorite passions: pacemakers, photography, and coffee! I took this photograph by feeding the output of an infrared barrier to the atrium input of an old DDD pacemaker, setting an appropriate AV delay, and using the ventricular output to trigger a camera flash (via a optoisolator).  In

 
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Compton Scattering Experiment

Spectrum Techniques of Oak Ridge, TN – a top supplier of Exempt Quantity radioisotope sources and nuclear measurement instrumentation – released today our tutorial: “Experiment Note: Exploring Compton Scattering Using the Spectrum Techniques Universal Computer Spectrometer”

 
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Radiation-Hardened IC Testing

Lately I’ve received many inquiries about the paper on radiation-hardness testing of implantable integrated circuits that I published with Dr. Larry Stotts (now Executive VP R&D at Biotronik), and the late Dr. John Prince.  This is because the effects of medical diagnostic and therapeutic radiation are becoming an issue of concern to physicians who often

 
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