Activity for coquelicotâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #285864 |
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— | almost 3 years ago |
| Edit | Post #285864 |
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— | almost 3 years ago |
| Edit | Post #285864 | Initial revision | — | almost 3 years ago |
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A: Creating an "Insights" category @Olin. I already read the help/papers doc you pointed out. And that's why I think a part of the papers are very far from the description there (except the "to educate" clause, at the most). As far as I understand, this category is intended to "presenting useful information to the world", be "m... (more) |
— | almost 3 years ago |
| Edit | Post #285861 | Initial revision | — | almost 3 years ago |
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A: How long does it take for energy to propagate in a circuit? I add my answer here because I think the other answers are incorrect or irrelevant: namely, the answer of Andy is nice after he has redrawn the schematic and changed the problem, answering to another (actually more interesting) question. The answer of Olin seems to me a bit misleading: even if th... (more) |
— | almost 3 years ago |
| Edit | Post #285858 |
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— | almost 3 years ago |
| Edit | Post #285858 | Initial revision | — | almost 3 years ago |
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Creating an "Insights" category Looking at the "papers" category, I found that several papers do not fit the very purpose of this category (that's the reason I've not upvoted them). Nevertheless, they are relatively well written, well thought out, and probably interesting for new comers in electronics. I think for example most of... (more) |
— | almost 3 years ago |
| Comment | Post #285817 |
OK. Anyway, I think a small choke to ground is the normal way to handle these problems, as I wrote in my answer. (more) |
— | almost 3 years ago |
| Edit | Post #285817 |
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| Edit | Post #285817 |
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| Edit | Post #285817 |
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| Edit | Post #285817 |
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| Edit | Post #285817 | Initial revision | — | almost 3 years ago |
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A: How to protect RF switches from ESD? Somewhat a pity to throw money for an expensive ultra-low capacitance TVS. You have not specified what is the frequency range of your antenna system, but since you say you have to protect it from human fingers, it is likely to be a small antenna in the gigahertz range. So, all what you need is... (more) |
— | almost 3 years ago |
| Comment | Post #285721 |
Hello Lundin. I think it would help if you can specify what is the general configuration of your system. Is your antenna connected by a coax to a microstrip circuit including, e.g. the pi filter and C3, which is itself connected to an RF switch via some coax? something else? I'm also surprised that y... (more) |
— | almost 3 years ago |
| Comment | Post #285737 |
These downvotes from trolls are a real pain in this site. Disgusting. I also agree with transparency regarding them, but even so, it would suffice to disable the downvoting for persons whose score is less than 100 to block most of the imposters. I don't understand why this simple measure has still n... (more) |
— | almost 3 years ago |
| Comment | Post #282265 |
@Olin. Your last interventions are not only extremely welcome for the atmosphere here, but seem in fact necessary to avoid the spoilage of this site by trolls or like (not related to Carloc). (more) |
— | over 3 years ago |
| Comment | Post #282288 |
@Leventov. Hi, I assume (hope) you are the person that have downvoted the answer. Could you please add a small reason in comments ? (more) |
— | over 3 years ago |
| Edit | Post #282288 |
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| Edit | Post #282288 |
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| Edit | Post #282288 |
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| Edit | Post #282288 |
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| Edit | Post #282288 |
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| Edit | Post #282288 | Initial revision | — | over 3 years ago |
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A: During a Li-ion cell charge or discharge at 1C rate, are the electrode interfaces at thermodynamic equilibrium? Please, have a look at this thesis, from P. 12 to the end. The bottom line is that the Buttler-Volmer equation, which is in fact equation (13) derived in P. 12 to 16 (called by the author the electrochemical diffusion model), is said to be the most accurate battery model. So, it is certainly not ... (more) |
— | over 3 years ago |
| Comment | Post #282265 |
@Carloc. >>once more just wanted to talk.
On the contrary, I was hostile because you didn't come to talk, but only come to downvote this answer. That's your prerogative, but really, there are better ways to do it. I am also tired because there is a troll with several accounts in that site who ofte... (more) |
— | over 3 years ago |
| Edit | Post #282265 |
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| Edit | Post #282265 |
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| Comment | Post #282265 |
@Carloc. I've edited my previous comment to make it less aggressive, as you seem to be honest. Regarding your last comment, see my new edits inside my answer. (more) |
— | over 3 years ago |
| Edit | Post #282265 |
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— | over 3 years ago |
| Comment | Post #282265 |
@Carloc. So, you address the last part of my comment, but you consciously avoid to address the first part that proved there were no mistakes or mismatches in the question of the OP. (more) |
— | over 3 years ago |
| Comment | Post #282265 |
But I've never seen that a person who answers should be punished because someone dislikes the question, especially after the question itself has not be downvoted !!! Really really strange at the least! (more) |
— | over 3 years ago |
| Comment | Post #282265 |
@carloc. The OP had clearly indicated from the beginning that R1 = 1 Ohm (see the schematic, and that's also clear from the second equality at the beginning of the question). Similarly, the OP had clearly indicated that the frequency is 1 Hz (schematic again). Even without the schematic, this normali... (more) |
— | over 3 years ago |
| Edit | Post #282265 |
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— | over 3 years ago |
| Edit | Post #282265 |
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| Edit | Post #282265 | Initial revision | — | over 3 years ago |
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A: Unexpected phase shift in results There is a mistake in the last line: $$\eqalign{V{C1}(t) &= V1(t) - RI{C1}(t) \cr &= \sin(t) - \dfrac{\sin(t) + \cos(t) - \mathrm{e}^{-t}}{2} \cr &= \dfrac{\sin(t) - \cos(t) + \mathrm{e}^{-t}}{2} \cr &= \dfrac{\cos(t-90^\circ) - [-\sin(t-90^\circ)] + \mathrm{e}^{-t}}{2}\cr &= \dfrac{\cos(t-90^\c... (more) |
— | over 3 years ago |
| Comment | Post #282139 |
From this answer, I now better understand the question, and in particular that the OP has a micro-controller (or something like that) already available to do many operations. I will update remove some aspects in my answer in accordance. (more) |
— | over 3 years ago |
| Edit | Post #282151 |
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— | over 3 years ago |
| Comment | Post #282154 |
Hi, looks like it's more related to physics or chemistry than to EE. (more) |
— | over 3 years ago |
| Edit | Post #282151 |
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| Edit | Post #282151 |
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| Edit | Post #282151 |
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| Edit | Post #282151 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Contactor control - Higher voltage PWM While your basic idea seems fine, I will not enter into this matter, especially after Olin has said he will. Instead, I will give some other ways to do that, that may be useful in other circumstances. First of all, there are also inductorless convertors, working with capacitors, that are much ... (more) |
— | over 3 years ago |
| Comment | Post #281971 |
Spectrum analyser + tracking generator sounds more complicated than a (vector) network analyser, which is especially designed for this task (and other). Note that there are now cheap so called "nano-vna" on the market that give decent results for antennas up to 1GHz.
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— | over 3 years ago |
| Comment | Post #282127 |
I'm not sure I understand why you are trying to do. Is the problem the following? : the contactor needs 12 V, 1.5A to switch, but after it has switched, it needs much less current because of hysteresis. So you are trying to design a power saving circuit, using the coil of the contactor as part of a 5... (more) |
— | over 3 years ago |
| Edit | Post #281653 |
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— | over 3 years ago |