Activity for Lundin
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #279876 |
It sounds like a layout problem, though it is of course impossible to say without seeing the PCB layout. Otherwise, the most common reason for failing ESD tests is that something isn't grounded that should be grounded. Also, how is the shield connected? Did you ground it at one side of the cable or b... (more) |
— | about 4 years ago |
| Comment | Post #279804 |
My point here is that we discuss things as a community and come up with a consensus about what to do with these kind of questions _before_ we run off to moderate posts. The current [on-topic/off-topic](https://electrical.codidact.com/help/topics) list doesn't even address repair questions. (more) |
— | about 4 years ago |
| Comment | Post #279796 |
The fuse F1 on the top side lower right corner looks like it's been through a lot of heat, and the solder joints look a bit fishy too. These are supposed to be recoverable fuses, but I'd definitely replace that one still, though I can't tell what exact part it is. Though of course, if it is blown, th... (more) |
— | about 4 years ago |
| Comment | Post #279796 |
PCB side 2 shows a lot of signs of a poor solder job. Check the top right corner of the last pic for example (looks like 0402). Probably they configured the placement machine poorly - there's too much solder everywhere and the potential for shorts looks extensive. Get some dirt on the board and anyth... (more) |
— | about 4 years ago |
| Comment | Post #279796 |
This post is discussed on meta [here](https://electrical.codidact.com/questions/279784). (more) |
— | about 4 years ago |
| Comment | Post #279804 |
There is not yet any consensus about what to do with repair questions and to what extent they are allowed. It is not yet addressed by the site policies as they stand. This meta post is a good place to discuss this and perhaps come up with specific rules. But until there is community consensus, please... (more) |
— | about 4 years ago |
| Edit | Post #279792 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Edit | Post #279739 | Post edited | — | about 4 years ago |
| Suggested Edit | Post #279739 |
Suggested edit: (more) |
helpful | about 4 years ago |
| Comment | Post #279739 |
Simply mask them before soldering? That is, put a piece of tape across the opening. Still, I don't quite understand how you can manage to get flux inside the connector. Use a flux pen or such, don't bathe the whole board in it straight from a bottle or something. (more) |
— | about 4 years ago |
| Comment | Post #279494 |
Basically, every EE needs to be _aware_ of the bullet points in my answer, even if they don't know how to perform them (prettily) in person. For example, one cannot do a decent PCB layout if one isn't aware of how heat from the soldering process spreads through the ground plane(s) and therefore route... (more) |
— | about 4 years ago |
| Comment | Post #279492 |
@manassehkatz As I said, it's another story :) Meaning it's a hot potato that will get debated whether or not it is on topic... elsewhere. (more) |
— | about 4 years ago |
| Comment | Post #279492 |
That being said, professional repair of cables means replacing the cable. Spliced cables are generally frowned upon, particularly in an automotive environment where there's some major oxidation and moisture present. One classic problem is where someone has spliced a cable, the joint is fine electrica... (more) |
— | about 4 years ago |
| Edit | Post #279492 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Edit | Post #279486 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Comment | Post #279302 |
Interesting answer, thanks. I don't understand why this was down-voted either. (more) |
— | about 4 years ago |
| Edit | Post #279248 |
Post edited: |
— | about 4 years ago |
| Comment | Post #279278 |
Regarding the "urgent" part, this should be covered by some network-wide policy against "fluff" like SE got. Irrelevant things such as "URGENT!" should simply be edited out. I'd down vote such posts too. But the "fluff" does not however necessarily make a post off-topic. The kind of posts with "URGEN... (more) |
— | about 4 years ago |
| Comment | Post #279250 |
@coquelicot Only these specific quoted parts that are about homework, for this discussion here. (more) |
— | about 4 years ago |
| Comment | Post #279250 |
@Olin Lathrop You are kind of missing the point that the people who do take the time to read this text are not likely the homework dump crowd. The bluntness makes us come across as elitist and gives a bad impression of the site to those who are sensible enough to do read the help before asking a ques... (more) |
— | about 4 years ago |
| Edit | Post #279250 | Initial revision | — | about 4 years ago |
| Question | — |
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) |
— | about 4 years ago |
| Comment | Post #279103 |
@Monica Cellio If that 4th slide means the question isn't visible on the site and the info is only visible to the poster (+those giving feedback & moderators), then I like it a lot. Possibly have something like a comment field that only exists while the question is closed? So that only those who are ... (more) |
— | about 4 years ago |
| Edit | Post #279248 |
Post edited: |
— | about 4 years ago |
| Edit | Post #279248 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Comment | Post #279103 |
"but how can that be done in a way that says to the author "you can do [some things] and then this will be suitable here"" On the old Codidact forums, I repeatedly pushed for making all feedback to the poster who got a question closed private. The question should simply by removed from the site until... (more) |
— | about 4 years ago |
| Comment | Post #279080 |
What's the impedance of cold solder blobs? Probably not 50 ohm... also, looks like a potential short to the left on the first pic. These are some seriously cold joints. My advise is to throw this in the garbage, then make a new attempt with larger 1210 or 2512 etc, as large as you can fit. Heat the p... (more) |
— | about 4 years ago |
| Comment | Post #278984 |
I'm not so sure in general that "question invites opinions" is necessarily the fault of the question. If someone decides to write an answer which is just pure speculation, without facts, references or source, then the problem is with that answer. (more) |
— | about 4 years ago |
| Comment | Post #278984 |
It isn't really opinion-based. If I ask a question if my THR components should be replaced with SMD to save cost, then the answer is yes and it's a fact, not an opinion, and you can easily prove it by comparing the price of lets say a 100nF THR aluminium electrolyte with a 100nF SMD ceramic. Then pil... (more) |
— | about 4 years ago |
| Edit | Post #278980 | Initial revision | — | about 4 years ago |
| Question | — |
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) |
— | about 4 years ago |
| Comment | Post #278855 |
I came across an interesting, detailed paper [here](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4884883/). So apparently microwave ovens sort under a specialized directive 2013/35/EU in the EU and also under specialized FCC Part 18 in USA. (more) |
— | about 4 years ago |
| Edit | Post #278886 |
Post edited: typo |
— | about 4 years ago |
| Edit | Post #278886 |
Post edited: |
— | about 4 years ago |
| Edit | Post #278886 | Initial revision | — | about 4 years ago |
| Answer | — |
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) |
— | about 4 years ago |
| Comment | Post #278856 |
That is, assuming that the oven and WiFi router both have FCC approval. Which I wouldn't automatically assume to be the case, some may just have "Ali Baba approval". (more) |
— | about 4 years ago |
| Comment | Post #278856 |
Bit of research about the equivalent rules in the US. https://www.fcc.gov/oet/ea/rfdevice claims that "these devices fall under the FCC rules 47 CFR Part 18". I'm not quite able to weed out which parts of Part 18 that are applicable though, §18.305 speaks of field strength of emissions for "Induction... (more) |
— | about 4 years ago |
| Comment | Post #278856 |
I read some loose rumour on the net about FCC having a special rule for microwave ovens, something about allowing 5mW in the near field, no idea if that's true (and I can't find anything about a similar rule in Europe either). However FCC part 15 generally allows a carrier of ~0.75mW ERP for short ra... (more) |
— | about 4 years ago |
| Comment | Post #278821 |
I posted a more detailed version of this question here: https://electrical.codidact.com/q/278855. Is it on-topic now? Please comment in the linked meta thread. (more) |
— | about 4 years ago |
| Edit | Post #278854 |
Post edited: |
— | about 4 years ago |
| Comment | Post #278854 |
@msh210 I now asked a more detailed version of your question here https://electrical.codidact.com/questions/278855, just to provoke more debate and maybe get some more detailed answers. (more) |
— | about 4 years ago |
| Edit | Post #278854 |
Post edited: |
— | about 4 years ago |
| Edit | Post #278855 | Initial revision | — | about 4 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) |
— | about 4 years ago |
| Comment | Post #278854 |
But please note that the scope of this site is most definitely _electrical engineering_, which means design of electronics, not use of electronics, or explaining electronics to laymen. The equivalent question on for example the programming site might go like "I have this program MS Word and I notice ... (more) |
— | about 4 years ago |