Collaborate Disseminate
[Martin Lorton] has a vintage Harmon 4200B selective voltmeter that needed repair. He picked it up on eBay, and he knew it wasn’t working, but it was in good condition, …read more Continue reading Inside a Selective Voltmeter
You’re designing an oscilloscope with modest storage — only 15,000 samples per channel. However, the sample rate is at 5 Gs/s, and you have to store all four channels at …read more Continue reading Oscilloscope Digital Storage, 1990s Style
We’ve certainly seen people take a photo of a part, bring it into CAD, and then scale it until some dimension on the screen is the same as a known …read more Continue reading Scan Your Caliper for Physical Part Copies
Although [Vitor Fróis] is explaining linear regression because it relates to machine learning, the post and, indeed, the topic have wide applications in many things that we do with electronics …read more Continue reading Understanding Linear Regression
You might be old enough to remember record platters, but you probably aren’t old enough to remember when records were cylinders. The Edison Blue Amberol records came out in 1912 …read more Continue reading Edison Phonograph Plays the Cylinders
These days, if you are in the market for a capable digital voltmeter, you might as well consider getting one with an oscilloscope built-in. One choice is the Owon HDS160, …read more Continue reading The Owon HDS160 Reviewed
It is easier than ever to produce projects with nice enclosures thanks to 3D printing and laser cutting. However, for a polished look, you also need a labeled front panel. …read more Continue reading Deep Dive on Panel Making
If you build electronics, you will eventually need a coil. If you spend any time winding one, you are almost guaranteed to think about building a coil winder. Maybe that’s …read more Continue reading Another Coil Winder Project
While most hams and hackers have at least heard of Heathkit, most people don’t know the strange origin story of the legendary company. [Ham Radio Gizmos] takes us all through …read more Continue reading Remembering Heathkit
[IMSAI Guy] grabbed an obsolete XOR gate and tried a classic circuit to turn it into a frequency doubler. Of course, being an old part, it won’t work at very …read more Continue reading XOR Gate as a Frequency Doubler