Activity for Lundinâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
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A: Motor Controller - What might be the purpose of these resistors? To expand on Olin's answer about power dissipation, one theory is EX/ATEX qualification for explosive environments. This is likely needed for these kind of cars, given the massive energy in those batteries. For EX qualification you are not allowed to have a thermal peak somewhere on the board in ... (more) |
— | almost 3 years ago |
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Is English translation of technical terms on-topic? Quite often, I find myself knowing the technical term of an electronic component in my native language, but not the proper English term. For example when translating a manual or other technical documentation to English, since these terms are far too technical to find in a dictionary. In such situa... (more) |
— | almost 3 years ago |
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Is there a way to reliably measure antenna return loss outside a lab? Assume I'm a complete beginner at RF. Is there a way to measure return loss of an antenna, in such a manner that I can reliably reproduce the measurement later on? What I'm talking about is producing the antenna characteristic graph to show what frequency it was adapted to and how wide it is. ... (more) |
— | almost 3 years ago |
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A: Is there a tool or trick for bending TO220 leads There's lots of specialized tools for various through-hole components overall, all of them generally called "lead benders". For TO-220 it appears that the term is lead bending/forming pliers. And there exist lots of different versions, depending on how you want the legs to go. This site (I'm not ... (more) |
— | about 3 years ago |
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A: Why do DC/DC switching controllers seem to favour the buck-boost topology over similar ones like Cuk, SEPIC and Zeta? I'm not sure there's a technical reason, except usually the offered parts are multi-topology and then they could be listed as buck-boost while they at the same time could as well be used as flyback, SEPIC etc. This seems to be the case for TI and Maxim, which at a glance seem to call everything "... (more) |
— | about 3 years ago |
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A: Isolated Digital Input - Overvoltage protection > Step 1: Since 3V3ISO would be LDO driven I would probably add a diode with the anode connected to the LDO output and a cathode connected with the LDO input to prevent the LDO to have output higher than the input. Based on my experience they tend not to love that. I haven't post that because I haven... (more) |
— | about 3 years ago |
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A: Name of this current limiting device It is some manner of BJT or MOSFET LED driver similar to for example this: NCR402T (just a random example, this one was PNP). They are literally called "SOT23 LED driver" (Mouser calls them "SOT23-3 LED Lighting driver"). Which exact part you have, I can't tell without marking. Plenty of manufact... (more) |
— | over 3 years ago |
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A: How about a new section for code reviews? Regarding scope of embedded systems/firmware When we released Software Development, I made a push to make all forms of embedded systems programming off-topic and re-direct such to this site. The reason for this is is my experience from the "embedded" tag over at SO, where I'm one of the top use... (more) |
— | over 3 years ago |
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A: What should rep gain/loss be on Papers? I think they should have the same rep as ordinary posts. If they are high quality they will eventually accumulate a lot of up-votes over time. That's how the voting system is supposed to work, rewarding quality over time. I have written lots of similar detailed papers or self-answered Q&A on SO an... (more) |
— | over 3 years ago |
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What should be considered when picking a flyback diode? Which are the parameters I should looking for when picking a flyback diode to be placed across a generic coil, such as a relay? That is: a coil with plain on/off functionality, for example a 24VDC relay coil with 700mW max coil power. I assume that these are the important ones: - Power dissipat... (more) |
— | over 3 years ago |
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A: CAN Bus - Internal Oscillator Check out What are the most common causes of CAN bus communication errors? As stated there, CAN requires a clock accuracy of 1.58% or your CAN node is non-compliant. I would recommend to use <1% however, which usually means external quartz. Some MCUs have good enough internal RC oscillators, your ... (more) |
— | over 3 years ago |
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A: Can I ask about debugging/fixing a broken product? A little check list of some basic things to ask yourself before asking such a question: - Is this some manner of high/mains voltage device? Repairing such electronics is very dangerous if you don't know what you are doing. In particular, unplugging the power cord doesn't mean that the device is no... (more) |
— | over 3 years ago |
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A: Are questions about proper cable repair on-topic? I just realized that the on-topic page https://electrical.codidact.com/help/topics doesn't address electronics assembly. This was always ok on "the old site", so I think it should definitely be ok here too. Basically, all questions about professional electronics assembly should be on-topic, includ... (more) |
— | over 3 years ago |
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A: Bit-rate vs Baud-rate Baudrate is most often used to mean payload data bits/second. Simply picture a manchester encoded protocol, where each data bit corresponds to 2 physical bits in the raw data frame. If you have a bitrate of 9600, you will then have a baudrate of 4800. There's lots of tutorials out there that descr... (more) |
— | over 3 years ago |
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Homework questions / "ask an engineer". Our on-topic page currently lists homework questions as mostly off-topic, in the following manner: > No interest in understanding or learning, "Just gimme da anser!" > >There has to be some element of engineering, theory, underlying physics, etc, in every question. This is why most Arduino quest... (more) |
— | over 3 years ago |
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A: Please find other ways to hide inloved questions that prompt close The default scope in this EE community pretty much went with the same scope as the SE site. For now. These sites are new and most communities are still struggling to come up with what's off-topic and what questions that should be allowed. Nothing is set in stone and there's always the possibility ... (more) |
— | over 3 years ago |
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Are questions about electronics market trends on-topic? I'm curious about the market trend of certain kind of components (specifically, 0603 ceramic capacitors) and if I should start worrying about these getting phased out. I started to write a question but then I realized that the question wasn't actually about electronics, but the electronics market. ... (more) |
— | over 3 years ago |
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A: Why is the ACK (acknowledge bit) in the CAN bus frames dominant? What could have been the rationale behind that design decision? You are forgetting that the transmitter plays part of it too. ACK is dominant simply because the transmitter sends ACK as recessive and any receiver must be able to override the recessive state of the transmitter's ACK bit. There's no "three state" or such available to the transmitter. CAN works l... (more) |
— | over 3 years ago |
| Question | — |
Microwave oven interfering with WiFi on the 2.4GHz band As I understand it, microwave oven magnetrons operate at 2.45GHz, which is an unlicensed band in most of the world. When 2.4GHz technologies such as WiFi (802.11), Bluetooth and Zigbee were launched, there were concerns that these would collide with microwave oven frequences. I remember a very early ... (more) |
— | over 3 years ago |
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A: Why are posts that users clearly approve of being closed? The current applicable rule from https://electrical.codidact.com/help/topics would be: > Off-topic > ... > High-level use of electrical devices. > > If your question treats a device like a black box and isn't about its theory of operation or its design tradeoffs, then it's likely off topi... (more) |
— | over 3 years ago |
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A: How to estimate time of completion while developing an electronic product? First of all, it depends on how much work the customer has done in advance. Do they have a proper spec? Do they at least have a bunch of key requirements? Or is it just "out there" and you must drag the spec out of the customer through interrogation and mind reading? If there isn't a proper spec, ... (more) |
— | over 3 years ago |
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A: Can I ask a question to which I have a possible answer? The key to writing good self-answered Q&A is to try to write the question just as if you didn't know the answer. That is, it has to fulfil the usual quality criteria for normal questions. This can be quite hard! My best advise is probably to give a specific example in the question. For example pos... (more) |
— | over 3 years ago |
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A: I have to choose: Arduino or Raspberry pi. - Rasp PI is a PC in disguise - it is a single-board computer. As such it runs Linux and like any Linux PC, it doesn't allow real-time execution, direct access to physical addresses, deterministic single-process execution etc etc. Writing drivers yourself is a complex process where you must foll... (more) |
— | over 3 years ago |
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Are BOM cost optimization questions on-topic? Are BOM/PCB assembly cost cost optimization questions on-topic here? I can see how chasing down specific parts, prices and vendors ought to be off-topic, so I don't mean outright shopping/second source recommendations. But I rather mean a design review of the schematic as whole, to suggest ch... (more) |
— | over 3 years ago |
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Getting rid of "company tags" early on I just made a post about using "company tags" over at Software Development: > We know from SO that company name tags were always problematic since: >- Questions are about products, not companies. >- Given that the product tag is present, the company tag doesn't add any relevant information to ... (more) |
— | over 3 years ago |
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A: How come the registers in a micro are application specific? They aren't specific to the project, but to the MCU. As long as you use the same MCU for multiple projects, they will be code compatible. Some hardware peripherals are even code compatible between different MCU families by the same manufacturer. Generally, registers are different in each and every... (more) |
— | over 3 years ago |
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A: Why RC toys still operate in 27Mhz band? I can think of a couple of reasons: - Lower frequencies mean superior range at the same output power. Whereas for example 2.4 GHz technologies tend to behave much more "directional" on short ranges, they are basically line of sight and don't handle obstructing objects/terrain between sender and re... (more) |
— | over 3 years ago |
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A: Let's have a "Papers" category. My biggest concern is that it will get too random and low quality. The worst that can happen is something similar to SO's failed "Documentation project" a couple of years ago, where users were to write documentation and examples of misc programming-related topics. These ended up in a separate pla... (more) |
— | almost 4 years ago |
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A: How to access a hardware register from firmware? Using pointer types In C, an object pointer such as `uint8t ptr` is the equivalent concept to use for hardware addresses. A compiler makes this pointer type large enough to contain all addresses in the microcontroller's default address space. It is valid to convert from an integer to a pointer... (more) |
— | almost 4 years ago |
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How to access a hardware register from firmware? When writing firmware in C for a microcontroller, how can I directly access a memory location such as a hardware peripheral register, given its absolute address? Is there a way to do this safely and portably in standard C without using the pre-made register map delivered together with the compiler... (more) |
— | almost 4 years ago |
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A: What are the most common causes of CAN bus communication errors? One rule of thumb is that a CAN network should never have any error frames when it is up and running. It is expected to have some when all nodes are "waking up", or if you hot plug something to the live bus, but other than that you shouldn't be seeing them or there are fundamental hardware or softwar... (more) |
— | almost 4 years ago |
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What are the most common causes of CAN bus communication errors? I can't get my CAN bus application (ISO 11898-2, classic "high speed CAN") working and I'm receiving various CAN error frames. These error frames manifest themselves as sequences of 6 bits with my selected bitrate, either high or low. Alternatively there is a "bus off" error and nothing works at ... (more) |
— | almost 4 years ago |
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A: Are we there yet? Hi there! The on-topic page https://electrical.codidact.com/help/topics might need a bit of tweaking and discussion. I think it is important that such a page attempts to be as specific as possible early on, so I quite like it and agree with most stuff there. But a few other things might need t... (more) |
— | almost 4 years ago |
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