Hello everyone! First off, I need to mention that my background is in Computer Science (this project is actually for my thesis) and not in Electrical or Computer Engineering. As such, everything I've learned has been largely on my own, within the past few months.
I have an idea for a new kind of keyboard, i think the best way to test it would be to make one and get it to work with my computer. If i can get each button on it to send a keypress signal like any other keyboard, i can work out the details with software like Kanata.
The batteries in this UPS lasted less than a year. It was because those battery were "no name" batteries, or because they were connected in series directly to the AC after the transformer? Shouldn't they have a rectifier and condenser before that? It seems that in this way the battery is connected to AC 24/7
Just working on my recent electronics project and I needed two temperature sensors for it. This time around I didn't feel like making a full PCB from KiCAD and wanted to keep things simple with a 1/2 size solderable breadboard.
This blogger booted an F1C100s from scratch, even though they made a mistake buying 16MBit instead of 16MByte of Flash. (Requiring to be booted off of USB-bootloader / Allwinner's FEL Protocol instead of Flash).
Edited the "I" for less confusion. The blogpost's title is "I made a...", but "I" (Dragontamer) didn't do this. I just found this blogpost and though it was relevant for this sublemmy.
I don't care what's it gonna take. I just want a connection. I guess I can connect the VCC to another voltage source, but I have the same thing happened to TX on another circuit board, although that one can "flip" (it is still attached marginally... at one end).
Some poor sap made a few hundred DIP chip labels for breadboarding that are designed for a little more functionality than is typical. They were uploaded to github along with a GIMP file, templates, instructions, and ready to print PDF files for labels and popular kits/projects like Ben Eater's breadboard computer and 6502 projects.
I found a radio from 2003 that was missing a power cord, and I first thought it needed a polarized C7 power cord, but it won't fit at all. Looking at it more closely, it looks like a polarized C2 connector, but it's also locking? I tried searching online but I couldn't find anything for the C1/C2 connectors that's polarized, not even considering the locking aspect. Is this something anyone is familiar with? It's not a high end or particularly old radio or anything.
I own a Samsung monitor, and when it's in standby mode the LED blinks all night. My hearing is so sensitive, and my room so quiet, that I can actually hear the LED powering on and off.
For those EEs interested in Wireless Communications like myself. Coming from more cellular communications type of stuff, I find the fact that 4096 QAM is possible over the air crazy.
I think I've covered the material needed for a beginner to analyze and choose microcontrollers. However, a beginner may not be comfortable with reading datasheets, or families of datasheets. As such, I'll help beginners through microcontroller families.
I was reviewing a recent project of mine, comparing the LTSpice simulations vs my real physical circuit, when I noticed that there are effectively two independent ways of measuring "ESR".
So I made an antenna based on a design on thingiverse/blog post. IIRC this is some Yagi variant. I did the math and did a bunch of tedious stuff to try and make it a proper project at the time. I do not have a network analyzer, smith charts are for shaman/wEEzards, and radio is the work of the devil. I was looking to extend the range of the 2.4G channel across my house just slightly using directionality. Empirically, it worked at first. I'm here half trying to diagnose, and half trying to understand some fundamental circuit design basics. The 2.4G output has two channels coming from the same peripheral radio chip. Normally these go to the dipole antennas. I used the same micro coax connector and proper coax throughout, with proper grounds/solder station/flux/etc. The continuity tests good still. The router automatically tries to move the transmit and receive signals between the two separate 2.4G channels under normal operation, but it drops one channel regularly now. I can see this on the network status of a connected device, and the drop happens regardless of proximity. I have not physically tested that the dropped channel is the one that had my DIY antenna. It could be a software problem. My curiosity is could this asymmetry cause a common failure mode, other than something obvious like ESD?
Preamble: I have been pushing the "I believe" button for way to long when it comes to crystal oscillators and their supporting components. The concept is simple, as they generally consist of proper loading and some kind of (pre)amplifier. "Small thing shake fast and you amplify". However, the full concept has never "clicked" in my brain and it feels like a huge knowledge gap that I should have filled years ago.
So I was thinking about Flash memory today, and I realized that the FTL / Flash Filesystems are overly-complicated for a lot of microcontroller applications. Still, microcontroller projects need some way to ensure that the NAND Flash wears out evenly (some uCs, like the AVR DD, only has 10,000 erase/write cycles on its Flash).
To get myself back into electronics, I pulled out an old project idea I've been wanting to do for a while, and that's a AA NiMH battery tester. I have a collection of ~30+ AA NiMHs that I use for various purposes: Flashlights, Switch Controller (yeah, they made an attachment), Electric Toothbrush, Walkie Talkies, etc. etc.
I'm working on implementing the PID compensator on the top of page 20 here. I've already got a circuit working, but it oscillates a ton, and I was hoping to tune it with a better strategy than just guess and check.
I am working on some extremely small designs where the entire board is less than 15mm2. There are a surprising amount of very small ICs but I've found it's really tricky to actually do a thorough part search for tiny (sub 2mm x 2mm) parts.
While we live in a day-and-age of overwhelming microcontrollers, the Analog Sensor world continues. A few resistors, capacitors, and an amplifier (General Purpose, Zero-Drift, Instrumentation...) can likely still have far superior performance than $1, $2, or $3 microcontrollers in practice. Bandwidth, detection and analysis of microvolt-level signals, and all at lower costs.
I've been a systems engineer for about 5 years, and while I do appreciate the exposure to a bit more hardware than a pure software engineer role would give me, I still feel like 95% of my job is coding.
QSPICE is a new and fast SPICE simulator written by Mike Engelhardt (author of LTspice). QSPICE was initially limited to beta testing in May, then expecting to become open beta testing in July.
EE major here, expecting to graduate in 2024. I'll have to admit that I'm only here because I wasn't admitted to the CS program and I've mostly been paying attention to trends in the software development industry, so please pardon my ignorance. My country (Sweden) has a great software industry but the hardware design and manufacturing industry isn't nearly as strong. The advice I get is that EE has great career prospects in semiconductors, IC design, microelectronics and defense, but most of these positions will require relocation which I'm not interested in. I'm clueless about RF and power systems, and besides, the compensation tends to be worse than the previously mentioned industries.
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