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The diagram shows the conditions that cause the Kohn anomaly to rise in convenient metals (left) and a material is known as a Weyl semimetal (right).  (Image Credit: MIT)   Researchers at MIT and elsewhere have discovered an exotic physical phenomenon called Kohn anomaly for the first time in an unexpected type of material. Their findings could develop a better understanding of certain processes that help to determine why metals and other materials exhibit complex electronic propertie ...
A small script for the DMM6500 to take a number of measurements, triggered by an external signal. This can be useful when you're automating a test setup. On a production line, on a binning desk, in a setup with a foot pedal, ... I've deliberately kept the script as simple as possible, to make it easy to grasp. You get a lot of functionality with just 8 lines of code.   Let's get straight to business. The TSP code: buffer_size = 10 app_buffer = buffer.make(buffer_size, buffer.STYLE_ST ...
dougw

Wire Spittin' Wire Spit

Posted by dougw Top Member Jun 15, 2020
Organizing wire stock is an important requirement in any lab but there are always costs and compromises. This is yet another attempt to deal with some of my spools of solder and hook-up wire. So far it is a great solution for my solder spools. It would be a good solution for my hook-up wire as well, except I am not sure I want to allocate the required real estate to the cause. The solution provides decent wire management at a cost of 74 grams of plastic per wire spool ($1.30 worth of plastic) ...
A little bit of nostalgia: my Philips power supply. 3 channels. Isolated. Constant voltage and constant current. And perfectly silent - no spinning fan. Made in Belgium! click to enlarge   Over here, Philips was the go-to brand for lab instruments. When I studied electronics, every instrument - except some Kyoritsu meters - was a Philips. In my own lab, this supply and a Philips oscilloscope were the pièces de résistance. I've sold the scope. I still use the power su ...
The AI-powered eye exam could replace the Snellen eye char in the future. The StAT test has proven to be more accurate. (Image Credit: Gary Cassel/Pixelbay)   Classic eye exams are poised to get an upgrade in the future. Researchers from Stanford University have created an online vision test powered by AI. This system is capable of producing diagnoses that are more accurate than the sheet of capital letters used in today’s eye exams. This eye test could be used by patients suffering ...
The KnittedKeyboard prototype was created by using advanced 3D knitting machines. By using this technology, the customized keyboard could be printed in just one hour. (Image Credit: Andreas Eggenberger, MIT Media Lab)   Instruments aren’t flexible or stretchable, but advanced 3D knitting technology could change that. Researchers at MIT’s Media Lab have developed KnittedKeyboard, a textile-based interactive surface created via machine knitting technology. This music controller i ...
I'm thinking about building a low power SMU. We're playing with OpAmps and discrete semiconductors regularly over here, and there's a Keithley 2450 SMU with I-V Tracer Software  road test going on. Learnings from those activities can be applied here.   image: over simplified concept   Goals: Only two; Make a Source Measure Unit. Make it programmable or scriptable   Possible capabilities: This would be a low power instrument, µA up to maybe a few mA. Low voltage ...
Image showing the smart molecule switches from a scanning tunneling microscope. Each bright molecule represents a single switch. (Image Credit: Dr. Kunal Mali, KU Leuven)   Data storage could one day be made up of smart molecules, providing up to 100 times more storage space than the ones we see today. An international team of researchers at Lancaster University have discovered a single-molecule switch capable of behaving like a transistor while making it possible to store binary data like ...
This is a followup to my road test review.  While doing some of the tests that I proposed in my road test application, I thought of a few others.  This was the one that jumped to the top of the list. The application is monitoring a building's current draw, both quantity and characteristics - such as large motor inrush demands caused by overhead cranes, etc.  Sometimes this type of survey is used to determine the size of a backup generator.  Sometimes it is used to determine ...
A blind participant in the study traced the letter ‘N’ on a touch screen after the implanted electrodes simulated a pattern on his visual cortex. (Image Credit: M. Beauchamp et al. ./Cell 2020)   Researchers from the Baylor College of Medicine in Houston have developed a brain implant called visual prosthetics that allows both sighted and blind participants to see the shapes of letters. Even though it’s still in the early stages of development, this technology could stimu ...
I wrote a blog in 2015 about using an FPGA as logic analyzer. In that blog, I promised to review the input buffer that I was using to translate 5V logic to 3V3. Then I didn't follow up on that.     Yesterday I made a second buffer, using parts and PCBs that I had lying around from a few failed previous attempts. A good excuse to finally document this.   What Is This Input Buffer?  The inputs of my analyzer are raw Xilinx Spartan 6 FPGA I/O pins. They aren't 5V tolerant ...

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