Activity for Lundin
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #278854 |
@msh210 If you can dig up the part number at least of the WiFi router and post which country you are in, then the question might be answerable. I don't know enough of microwave ovens to tell if they use different spectrums, I believe most are on 2.4GHz. But WiFi could be 900MHz, 2.4GHz (most common)... (more) |
— | about 4 years ago |
| Comment | Post #278854 |
@Kranulis In that case it was incorrectly closed, I believe. But it could be closed for the lack of detail/too broad. (more) |
— | about 4 years ago |
| Comment | Post #278834 |
If you bring up a specific post on meta, please leave a comment under that post telling that the post is being discussed, so that the OP and readers who come across it get pinged about it. I have done so now. (more) |
— | about 4 years ago |
| Comment | Post #278821 |
This post is discussed on meta [here](https://electrical.codidact.com/questions/278834). (more) |
— | about 4 years ago |
| Edit | Post #278854 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Comment | Post #278823 |
I doubt that such an oven is legal though. Spurious emissions is typically limited to -37dBm ERP (in EU at least) and a -37dBm signal would not interfere with WiFi. (more) |
— | about 4 years ago |
| Comment | Post #278720 |
@coquelicot Well, this time estimate _has_ to be done by someone with domain experience, ideally an engineer with practical experience. I think all answers posted here come to that same conclusion. (more) |
— | about 4 years ago |
| Edit | Post #278720 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Comment | Post #278707 |
But that customer had a fairly experienced purchaser who determined who got the contract, which isn't often the case. Still, the good customers who can call the bluff on BS offers are often the ones you want too, because they appreciate professionalism and quality. (more) |
— | about 4 years ago |
| Comment | Post #278707 |
@Adam Lawrence "if you consistently lose business because your timelines are too long". I've been through the opposite. I did a time estimate of one project and came up with something like 4 months. The competitor offered something like 1.5 months. The customer knew we were experienced, so he look ou... (more) |
— | about 4 years ago |
| Comment | Post #278654 |
@Circuit fantasist I have written lots of such posts where the true intention is rather to provide an answer to a FAQ, [example](https://software.codidact.com/questions/277486). Of course others are free to answer the question too, in case they believe they can write a better answer. Which is why it... (more) |
— | about 4 years ago |
| Edit | Post #278654 |
Post edited: |
— | about 4 years ago |
| Edit | Post #278654 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Comment | Post #278421 |
Here we go with the "8 bit is fantastic" war again... The 8 bitters fan club ran out of arguments well over 10 years ago. I've programmed icky 8 and 16 bitters, as well as custom 32 bitters, far more than I've programmed ARM. And that is the very reason I now avoid 8 and 16 bitters like the plague. Y... (more) |
— | about 4 years ago |
| Comment | Post #278421 |
@coquelicot Rather, _most_ microcontrollers are general-purpose ones. The vast majority of them have the same kind of common hardware peripherals: ADC, timers, PWM, UART, SPI. Traditionally, before ARM became mainstream, there were camps of devs preferring one flavour of MCUs over the other. And bef... (more) |
— | about 4 years ago |
| Comment | Post #278421 |
You can have virtual memory on microcontrollers too, on the more high end ones with MMU. But then such high end 32 bitters are about the most complex parts out there, so nothing I would recommend for beginners. (more) |
— | about 4 years ago |
| Comment | Post #278420 |
You'll have to learn about wait states, DMA etc but those are things one need to know when doing modern MCU programming. It's all MCU specific though. Again, I wouldn't recommend any particular flavour of ARM. I've worked with ST, NXP/Freescale, Microchip and Silabs ones. What you should be wary of i... (more) |
— | about 4 years ago |
| Comment | Post #278420 |
@Kranulis Depends what you mean with "step up", as in learning process? If so, then AVR is about as complex as the average 8 or 16 bitter out there. Programming some other more code efficient 16 bitter isn't that much different at all. The problem with 32 bitters isn't the core itself, but that they... (more) |
— | about 4 years ago |
| Edit | Post #278420 |
Post edited: |
— | about 4 years ago |
| Edit | Post #278420 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Comment | Post #278355 |
Slightly OT, but these parts absolutely hate voltage in reverse. A common design mistake with various linear regulators is to plug in an external voltage to the 5V etc plane and supplying that one from a MCU programming equipment. With no Vin present but 5V backwards on Vout, the regulator often brea... (more) |
— | about 4 years ago |
| Comment | Post #278342 |
In general, old standard logic circuits were very sensitive to ESD. Most newer parts no matter the kind has some manner of ESD protection. Still, it happens now and then that something breaks through ESD. Often the rare, mysterious kind of errors where a part breaks after some time in the field and y... (more) |
— | about 4 years ago |
| Comment | Post #278193 |
@coquelicot Is the power supply part of your product or designed by someone else? Can you modify it or buy a better one? Does it have a common-mode choke? https://en.wikipedia.org/wiki/Choke_(electronics) It usually looks exactly like the one on the top of the wiki page: a somewhat big, through-hole ... (more) |
— | about 4 years ago |
| Comment | Post #278192 |
Wouldn't you rather want a band pass filter at 100Hz +/- something? Could you give more details about the signals and application? What about currents? (more) |
— | about 4 years ago |
| Comment | Post #278161 |
(Somewhat related to that, [Rules and guidelines for drawing good schematics](https://electronics.stackexchange.com/questions/28251/rules-and-guidelines-for-drawing-good-schematics) was an awesome community wiki that I think we should consider importing here.) (more) |
— | about 4 years ago |
| Comment | Post #278161 |
One reason I asked is because such a review case popped up at electronics.stackexchange and it was closed as shopping recommendation. So it would be fine for us to send them here instead? Maybe we need to cook up some general guidelines for how to ask schematic/design review questions. (more) |
— | about 4 years ago |
| Edit | Post #278136 | Initial revision | — | about 4 years ago |
| Question | — |
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) |
— | about 4 years ago |
| Comment | Post #278052 |
I always assumed the term discrete came from discrete mathematics, so yes...? (more) |
— | over 4 years ago |
| Comment | Post #277992 |
Not related to your question, but please note that if you don't use one of the exact approved antenna designs by the chip manufacturer, you must redo all 3rd party testing, both for RED/FCC etc and bluetooth conformance testing. (more) |
— | over 4 years ago |
| Edit | Post #277912 |
Post edited: |
— | over 4 years ago |
| Edit | Post #277912 | Initial revision | — | over 4 years ago |
| Question | — |
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 4 years ago |
| Edit | Post #276256 | Post edited | — | over 4 years ago |
| Comment | Post #277845 |
So the only thing you changed was cap chemistry, not the capacitance? What does the layout look like? THR or SMD? X5R, NP0? (more) |
— | over 4 years ago |
| Edit | Post #277543 |
Post edited: |
— | over 4 years ago |
| Edit | Post #277543 | Initial revision | — | over 4 years ago |
| Answer | — |
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 4 years ago |
| Comment | Post #277541 |
Typically there is an actual register hidden beneath the addressable RAM location though, and hardware handles transitions between them. Like for example SPI will have an actual hardware shift register underneath the memory location called SPIDR. (more) |
— | over 4 years ago |
| Comment | Post #277467 |
@aditya98 433MHz can be used license free in most of Europe, Middle-East, South America, Australia and Africa. It has lots of restrictions in North America and South-East Asia, where it is typically either used for ISM or for RFID container systems. Frequency allocation world-wide is a complete mess ... (more) |
— | over 4 years ago |
| Edit | Post #277466 | Initial revision | — | over 4 years ago |
| Answer | — |
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 4 years ago |
| Comment | Post #276662 |
Also from what I recall, you are supposed to increase the number of parallel zener diodes depending on safety class. From what I remember, EX class 0 with intrinsically safe system requires 3 zeners. Supposedly to even out the heat between them. (more) |
— | over 4 years ago |
| Comment | Post #276669 |
@Hawk2020 You almost certainly need a consultant - contact some test house with a good reputation for EX/ATEX. You can usually hire them for a few days to do a design review of your system and point out problematic parts. It's not just the electronics, but all mechanics, plastics etc. These kind of p... (more) |
— | over 4 years ago |
| Comment | Post #276649 |
Why Li-Ion btw? These are very nasty from an EX perspective. NiMH or NiCd etc are much safer, although they are of course bigger and heavier. (more) |
— | over 4 years ago |
| Comment | Post #276649 |
I don't remember, but the idea was to block current rush in case each regulator fails and de-centralize current rush protection across the board, instead of relying on one single fuse. Thermal shut-down because of overcurrent is for example not feasible. But this was also a whole lot more complex ele... (more) |
— | over 4 years ago |