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Posts by Lorenzo Donati‭

28 posts
77%
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Q&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: Fr...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta 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 si...

posted 3y ago by Lorenzo Donati‭  ·  edited 3y ago by Lorenzo Donati‭

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Q&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...

posted 1y ago by Lorenzo Donati‭

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Q&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-o...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&A 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....

1 answer  ·  posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&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 decima...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta 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 manu...

2 answers  ·  posted 3y ago by Lorenzo Donati‭  ·  last activity 3y ago by Olin Lathrop‭

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Meta 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 loo...

1 answer  ·  posted 3y ago by Lorenzo Donati‭  ·  last activity 3y ago by Olin Lathrop‭

Question discussion papers
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Meta 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 search_term will trigger the following URL: https://electrical.codidact.com/posts/se...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&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 ...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta 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" tag...

1 answer  ·  posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by trichoplax‭

Question support tags
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Meta 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 ...

3 answers  ·  posted 1y ago by Lorenzo Donati‭  ·  last activity 1y ago by Lundin‭

Question discussion tags
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Q&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 {V_2} {V_1} \qquad\qquad B = \frac {R_L} {R_S} ...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta 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 ...

posted 1y ago by Lorenzo Donati‭

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Q&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...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&A 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...

1 answer  ·  posted 1y ago by Lorenzo Donati‭  ·  last activity 1y ago by Lorenzo Donati‭

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Meta 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 ha...

posted 3y ago by Lorenzo Donati‭  ·  edited 3y ago by Lorenzo Donati‭

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Q&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...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&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 Polyet...

posted 1y ago by Lorenzo Donati‭

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Q&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 amp...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&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 ...

posted 1y ago by Lorenzo Donati‭

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Meta 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 ...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta 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 man...

posted 1y ago by Lorenzo Donati‭

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Q&A 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: ... My question i...

1 answer  ·  posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Nick Alexeev‭

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Meta 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 ...

3 answers  ·  posted 1y ago by Lorenzo Donati‭  ·  last activity 1y ago by Monica Cellio‭

Question support tags