#Electronics

Osna.FMosnafm
2025-07-24

Germany's electrical industry anticipates a return to growth by 2025, marking a significant shift from a challenging year. According to Gunther Kegel, President... news.osna.fm/?p=9181 |

2025-07-24

Now I know more than what anyone ever wanted to know about a coax cable connected to nothing. #electronics

Fringe Capacitance of Open-Ended Coax
Bibliography

The study of discontinuities in transmission lines began since World War 2 at MIT Radiation Laboratory, including contributions by noted physicists such as Julian Schwinger. Summary of the fringe capacitance of open-ended vacuum coax cables (among other results) can be found in Waveguide Handbook, Volume 10 of MIT Rad Lab Series textbooks, and still serves as a reference today, although the result is vacuum-only and the accuracy is slightly lower than modern numerical treatments.

In spite of its history, study of this problem continues based on a diverse category of methods, including the Rayleigh–Ritz variational method, Least-Squares Boundary Residual Method (LSBRM), Schwarz-Christoffel transformation, Finite Element Method (FEM), and Method of Moments (MoM). The first motivation is found for developing open-circuit and capacitance calibration standards for impedance and network analyzers, which is the focus of most of the papers cited here. The second motivation originated from material science and biology for developing coaxial probes and sample holders for dielectric sample characterization. This made generalization of the computation from a homogeneous vacuum cable to a PTFE-filled coax probe terminated by a sample with a different permittivity. The third kind of papers originated from computational electromagnetics as a benchmark problem for comparing field solvers based on different numerical methods - which in turnA full screen of citations on open-ended coax cables as probes or calibration standards.
2025-07-24

This prototype cycle for my temperature and humidity tracker is almost complete with a new 50% slimmer case. It's been quite a journey #electronics #kicad #esp32 #micropython #blender #3dprinting

3D printed case in sparkly red filament and PCB. Mechanical pencil included for scale.
2025-07-23

Tom’s Hardware: PCB reference books with pages made from actual USB-C powered PCBs are now available at $37 each. “An electronics, metalworking, and 3D printing enthusiast has created some Reference Circuit Books where the ‘pages’ are PCBs. Published by Bolt Industries, there are presently two volumes available, with their content produced by the aforementioned expert enthusiast and […]

https://rbfirehose.com/2025/07/23/toms-hardware-pcb-reference-books-with-pages-made-from-actual-usb-c-powered-pcbs-are-now-available-at-37-each/

2025-07-23

Wondering what goes on inside a lever-wire connector? Here ya go!

This is a KF141V compact 0.1" vertical connector. So far, seems like a great alternative to screw terminals.

It's quite difficult to actuate the lever, which is great. It is spring-loaded, so it returns to closed position nominally - no multi-stable mechanism. #electronics #pcb

Partially-disassembled lever-wire connector with a wire installed to show where the wire seats against the contactPartially-disassembled lever-wire connectorFully-assembled lever-wire connector
2025-07-23

electric cats, a simple question for you: I have an electric guitar with a 5 way switch (2 dual humbuckers, 1 single coil). The 5 way switch is wired such that positions 0, 2, and 4 are neck humbucker only, single coil only, bridge humbucker only.

I swapped them out recently and those positions work 'fine' (except I think I soldered the wrong pickups to the wrong position, but hey, it's symmetrical, who cares?).

Positions 1 and 3 are a combination of a single pickup from the humbucker (split) and the middle single coil, and these are
much more compressed and lower volume than the other positions. I think I fucked up the soldering and suspected I did something like swap the hot and the ground wires for each humbucker.

My question: A, without pictures or more information, does that make sense/seem plausible? B, would this be an easy to answer question if I gave more info and some pictures? C., ... what would this phenomenon even be called so that I might be able to look it up more in depth to see where I went wrong? It's like they're almost perfectly out of phase, or something; the reduction in volume and compression reminds me of destructive addition.

I wasn't able to find exact wiring diagrams for the new pickups (some inexpensive licensed duncans that are apparently duncans in name only) but the Ibanez wiring diagrams are easy enough to find. Any help or insight anyone can give would be super appreciated! It's still quite playable, as I largely just avoid positions 1 and 3 right now.

Thank you! reboosting totes appreciated

#electricGuitar #ibanezGuitar #pickupWiring #pickups #electronics #electronicWiring #soldering

𒀭 enkidu 🍤cat@social.lol
2025-07-23

Anyone know the hex code for alpine stereos that triggers Siri on an attached phone? Pls boost? #alpine #electronics #hacking

David W. Body 🇺🇸 🇺🇦davidbody@fosstodon.org
2025-07-23

Here's a clearer picture of what the scope displays.

#electronics #oscilloscope

An oscilloscope displaying a active-low pulse-width modulated signal from an infrared receiver module.
David W. Body 🇺🇸 🇺🇦davidbody@fosstodon.org
2025-07-23

This is kind of fun. Using an infrared receiver module (TSOP38238) to display the signals produced by a Blu-Ray player remote control on an oscilloscope. The signals are active-low and pulse-width modulated.

#electronics #oscilloscope

2025-07-23

Hey folks, I am doing a presentation on a brief history of #usb at work later this week and was wondering if Mastodon had any suggestions/annecdotes/things you wished you knew earlier that might be worth including?

#tech #electronics #computers

blaze.emailblazeemail
2025-07-23

🔌 This week in Electronics: DIY GPU fan repair with ATtiny85, Automated Contact Angle Tester for materials testing, and deshrouding a 3070 GPU.

blaze.email/Electronics

2025-07-23

I've been looking to get into PCB design a little more recently. I have a pretty solid grasp of the actual theory/design process and experience with KiCAD, but it's the actual logistics that I'm stuck on. Specifically, where is the best place to buy components?

Do you buy them in bulk? Alongside each other in the same shipment from some vendor? How do you deal with having enough of the many different types of SMD caps/resistors? I feel like getting stuff from say aliexpress in individual shipments of each component type is not very cost effective.

#electronics

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