An AC Current Generator, Part 4 Aubrey Kagan 1/13/2015 3 comments In parts 1 through 3 I described the construction of the transformer we needed to generate the 10Amps AC. We still had to drive the transformer.
An AC Current Generator, Part 2 Aubrey Kagan 12/11/2014 3 comments When testing, a 10 amp AC current is fed into the module being tested (DUT) and the current is measured across a 25 mΩ shunt internal to the DUT.
An AC Current Generator, Part 1 Aubrey Kagan 12/1/2014 9 comments I wrote an article on this topic in 2000 that was published on Circuit Cellar Online. I believe that the basic information that I wrote about is still relevant and so I am rewriting the article as a blog.
Power Dissipation: My Arch-Nemesis Aubrey Kagan 9/3/2014 15 comments Experience should have taught Aubrey Kagan to consider power dissipation before introducing a component into a design. Unfortunately, it always seems to come back to bite him.
How a Coffee Packaging Machine Educated Me Aubrey Kagan 7/18/2014 29 comments One of my first projects was to design a control for a coffee packaging machine. It was in the late 70s and microprocessors were on everybody's lips, but few actually knew anything about them.
Excel-Optimizing Resistor Ratios, Part 1 Aubrey Kagan 6/10/2014 19 comments I have often wondered whether the practice of using a ratio of two resistors to determine a particular output is a fundamental property of electronics or a concerted effort by designers.
Excel: Taken for Granted, Part 1 Aubrey Kagan 5/7/2014 22 comments When I started my blogs on Excel, I launched straight into it without any mention of some of the simple features that you may or may not know. As I move on, I think perhaps I should cover some of these features.
Excel: Conditional Formatting Aubrey Kagan 3/12/2014 40 comments When you right click on an Excel worksheet cell, you can change its numeric type, alignment, background color, and other properties. But did you know that you can have the cell change its format if different conditions are met?
Temperature Measurement, Part 1 Aubrey Kagan 3/6/2014 29 comments This series of Temperature Measurement blogs was first published on the late, lamented forum, Microcontroller Central. I have modified it very slightly.
Analog Isolation Techniques, Part 3 Aubrey Kagan 12/13/2013 6 comments Galvanic isolation of signals can be difficult. Isolation of analog signals can be even more difficult. Here are some techniques to explore and devices to use.
Analog Isolation Techniques: Part 2 Aubrey Kagan 12/12/2013 6 comments Galvanic isolation of signals can be difficult. Isolation of analog signals can be even more difficult. Here are some techniques to explore and devices to use.
Using Solver in Excel, Part 2 Aubrey Kagan 11/7/2013 18 comments One of the add-ins for Excel is Solver. It allows you to easily solve problems with multiple variables. Here's how to install and use it.
Using Solver in Excel, Part 1 Aubrey Kagan 11/6/2013 16 comments One of the add-ins for Excel is Solver. It allows you to easily solve problems with multiple variables. Here's how to install and use it.
Calibration, Part 2 Aubrey Kagan 9/20/2013 7 comments Continuing the discussion from Part 1, how do you ensure accuracy? How do you perform the calibration? On what reference is this calibration technique based? How does noise affect calibration?
Calibration, Part 1 Aubrey Kagan 9/9/2013 20 comments Analog measuring devices should be calibrated to ensure accuracy. How do you perform the calibration? At how many points? And on what is this calibration technique based?
RMS Measurement Aubrey Kagan 8/23/2013 12 comments How do you make a true RMS measurement of a complex (non-sinusoidal) waveform? There are various techniques.
NASA has some of the best scientists and engineers in the world that are challenged to develop manned and unmanned exploration systems that can travel in deep space searching for an answer to “What is out there” while stretching our capabilities to beyond the limits of our imagination
I’ve been thinking about ethics recently, but not the generic kind represented by violations like taking a company pen home. And who among us can claim to be purists? I can’t—I have plenty of company pens laying around my office. And, truth-be-told, my war stories get more polished and elaborate each year. Let the stones in my glass house be unthrown.
One of the more impressive presentations of a gadget at a recent Maker Fair was a floor-mounted four-hoop device with LEDs along each hoop. The hoops were circular in shape as though they were the longitude lines on a globe. When the contraption was rotated and the LEDs driven under computer-based control, a 3D display appeared. The resolution was visibly low but at inventor shows, it is more the idea that counts than its immediate refinement.