Activity for Lorenzo Donati
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
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A: Deriving resistor values for a taper pad attenuator Here is another take at that problem. First let's define some quantities that will be useful later: \[ \begin{align} A &= \frac {V2} {V1} \qquad\qquad B = \frac {RL} {RS} \qquad\qquad r1 = \frac {R1} {RL} \qquad\qquad r2 = \frac {R2} {RL} \qquad\qquad ... (more) |
— | 8 months ago |
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A: Tag creation/deletion criteria I agree with the answer of Lundin except for point 3 disambiguation. >Regarding 3), in case a term does have several different meanings and all meanings are on-topic, then the most common/jangon use of the term takes precedence. Instead, I would proceed in this way: In case a term has sever... (more) |
— | 9 months ago |
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A: Cable loops between utility poles? Those are fiber optic cables that are wound back and forth between those "snowshoe" devices, which are used to limit the bend radius of the fiber. Those are needed to avoid propagation losses due to the fiber being bent more than its rated maximum bend radius. The fiber must have so much slack ... (more) |
— | 9 months ago |
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How to request a mass-change in capitalization for tags? In my effort to clean-up and organize tags on EE.CD I arrived at a point where there are a lot of old tags with wrong capitalization. How should I request the staff to change them? Should I post here on meta a list (maybe as an edit in this post) with something like this: old --> NEW for ... (more) |
— | 9 months ago |
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Big tags overhaul - 1st part - please delete those tags! I've just finished a first clean-up of the tags pages, where I consolidated tags, provided synonyms, wrote guidance text and defined some hierarchy. As a result there are quite a lot of "dead" tags that should be deleted (beginning at page 4 of 5). Please could a mod escalate this to the staff ... (more) |
— | 9 months ago |
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A: H(jω) does not exist for unstable systems, but we still use it when designing controllers - contradiction? I don't have that book, but the statement you cite (emphasis mine): > ... when s=jω the integral on the RHS of eq. 2.48 does not converge for unstable systems doesn't mean the transfer function for an unstable system doesn't exist. The book makes a lot of confusion between Transfer Fun... (more) |
— | 9 months ago |
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A: Why 3.3V instead of 3V? Sorry, but I have to challenge your premises when you say that most numbers are "round numbers" and that could be a reason for choosing some value. You compare those values by the number of decimal digits, but that's the wrong comparison. You should compare the significant digits. In fact wh... (more) |
— | 9 months ago |
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Tags about quantities: should we have them? I've noticed there are a lot of tags referring to general physical quantities (e.g. `current`, `voltage`, `frequency`) I'm not sure if they are useful. For example, what usage would have the tag `voltage`? If a question is about a particular voltage, e.g. breakdown voltage for a diode or threshol... (more) |
— | 9 months ago |
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Tag naming guidelines. I've done a lot of work on tags lately and I'd like to share with the community some thoughts about the way tags should be named so that maybe it could become part of the FAQ and so hopefully lead to a more uniform tagging practice. + Acronyms should be spelled in all uppercase. This to avoid co... (more) |
— | 9 months ago |
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A: What is dynamic resistance? Is it related to differential resistance or to incremental resistance? Introduction Yes, all those terms denote the same concept, that of differential (or incremental, or dynamic) parameter of a device. In the following I will explain such a concept initially in the context of dynamic resistance, but it will be apparent that the same concept has a wider applicatio... (more) |
— | 9 months ago |
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What is dynamic resistance? Is it related to differential resistance or to incremental resistance? What is the concept behind the dynamic resistance that often pops up when dealing with non-linear components and the circuits in which they are employed? Is the concept related to other terms like differential resistance or incremental resistance? (more) |
— | 9 months ago |
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How about a `basic-circuit-block` tag? I'm in the process of giving the tags page some structure, writing tag descriptions and creating synonyms and some hierarchy. I'd like to know the Community stance on a new tag I'd like to add: `basic-circuit-block` It should act as a parent for tags that denote all those basic electronic ci... (more) |
— | 9 months ago |
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A: What effect will extreme temperatures have on characteristic impedance of a wire? RG58 cables come in different variations, even with Teflon dielectric suitable for 200°C operations. Your cable, being suitable for up to 80°C, seems to be one of those with a PVC jacket and Polyethylene inner insulator, like this. It's bad news for several reasons, and Olin explained a few. I'll... (more) |
— | 9 months ago |
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A: Low-pass filter after the output DAC in CD players One of the main reasons was hinted by Olin's answer, at the end, when he spoke about non-linearities. The same is hinted in the excerpt in Nick Alexeev's answer ("they would overload the player amplifier"). I want to be explicit and mention a very easy example: consider a simple amplifier with a v... (more) |
— | 9 months ago |
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A: Why is the resistance of water so high and still so dangerous? Most of the issues have been discussed by other answers. However I would like to clarify something about pure water (a.k.a. "distilled water" or "demineralized water"), which is "apparently" not a good conductor and would seem to pose less danger than tap water or other "dirty water". To avoid giv... (more) |
— | 9 months ago |
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A: Is the noise of op-amps and ADCs Gaussian, possibly with zero mean? Your title question about the "Gaussianity" brings up a lot of thorny issues, since noise in electronic components is quite a difficult topic from a physical, fundamental point of view. TL;DR: From a designer perspective: + Noise is assumed to have zero mean because even if it had non-zero m... (more) |
— | 9 months ago |
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A: Is English translation of technical terms on-topic? I think we should definitely allow technical terms translations, because it's really difficult to find reliable sources online. And the translation process can be tricky, since the translated term can be context sensitive. Some examples in Italian: array antennas --> antenne a schiera ("schiera" h... (more) |
— | 9 months ago |
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A: Creating a FAQ: how to read a datasheet I agree with Olin and Mu3 answers. I'll add that you should aim not for just one kind of "high level" component, but many more basic ones. Not every EE course is the same across the world, and many different degrees fall under the EE umbrella term, and not every one of them has the same level of e... (more) |
— | 9 months ago |
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Is there an easy way to measure the characteristic impedance of a cable using basic lab instruments? As the title says, I'm interested in a simple technique to measure the characteristic impedance of a cable using only the instruments available in a school lab or to a (somewhat advanced) hobbyist. In particular: + Digital oscilloscope with 50MHz bandwidth and simple passive probes (x1, x10). ... (more) |
— | 10 months ago |
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A: Is ESD overhyped? Something that hasn't been mentioned in other posts yet is that ESD events needn't be utterly destructive. Most ESD events are "microevents". That is, they don't damage a part by rendering it non-operative, but they simply degrade its characteristics. This is more evident in parts used for their p... (more) |
— | 10 months ago |
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A: How can we grow this community? I just submitted a proposal to DuckDuckGo here for a new "bang" for their search syntax. If approved: `!coddee searchterm` will trigger the following URL: `https://electrical.codidact.com/posts/search?search=searchterm` I did the same for SW Development Codidact (here the announcement). ... (more) |
— | 10 months ago |
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Are a JFET's Idss and Vgs(off) values correlated? I know that many JFETs parameters have a very large manufacturing spread, in particular, $I{DSS}$ and $V{GS(off)}$, as one can see (for example) in this datasheet excerpt: J175/J176 datasheet header ... J175/J176 datasheet - electrical characteristics table My question is if the spread of... (more) |
— | 10 months ago |
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A: What material is used in the tabs of power packages? (TO-220, D2PAK, etc.) A definitive answer is hard to give, since the information is not easily available. However, after a bit of research I'm inclined to believe that the most common materials are copper, copper alloys or sometimes Fe-Ni alloys, plated with some other material to prevent oxidation. Note that the tab i... (more) |
— | 10 months ago |
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A: What are the guidelines for porting one's answers from ElectricalEngineering.SE, if any? Since my question didn't get an answer yet, I post this answer as a possible solution. What I'll describe is not meant to be the right way to port an answer from SE network, but just a possible right way. So if you feel another approach could work as well, please add an answer here. Premise... (more) |
— | almost 3 years ago |
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A: Are questions about electronics market trends on-topic? I largely agree with Olin Lathrop's answer. However, I think questions should be on-topic also if the trends have no direct technical motivations, on condition that the reasons can be backed by hard data in the context of a potential or actual design. For example, imagine you are planning to d... (more) |
— | almost 3 years ago |
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A: How about a new section for code reviews? I'm too new to this site's mechanics to judge whether a new category is warranted or not. However I really welcome the idea of supporting design reviews (both HW and SW) to a larger extent than simple troubleshooting a specific part of a design, which is already allowed now. I would particularl... (more) |
— | almost 3 years ago |
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What are the guidelines for porting one's answers from ElectricalEngineering.SE, if any? I've noticed that in the edit account section there is a (inactive) link to one's content on a StackExchange site. This made me wonder if it is appropriate to transfer some content from EE.SE manually. I have quite a bunch of good answers there and I'd like to "migrate" them here, perhaps after... (more) |
— | almost 3 years ago |
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Can a paper be a tutorial or textbook-like? Although I joined Codidact from the beginning, I was never truly active and lost track of the development of the system and this site in particular. I've read the help and the "paper" category looks interesting (it seems to address some of the suggestions I made in the very early brainstorming da... (more) |
— | almost 3 years ago |