Activity for coquelicot
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A: High Power Switch - High Side vs. Low Side Switching Answer to question 1: First, you need p-mos and not n-mos, as you are switching the circuit from the above. Second, it is better and simpler to parallelize mosfets for big current switches; this will reduce the power dissipation as well. So, even if there exist a pmos with 150A ability (which... (more) |
— | over 3 years ago |
| Edit | Post #279600 | Post edited | — | over 3 years ago |
| Suggested Edit | Post #279600 |
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helpful | over 3 years ago |
| Edit | Post #279431 |
Post edited: wrong op-amp in schematic |
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| Comment | Post #279431 |
@Circuit fantasist. The most banal 3$ digital multimeters like the ones in the OP question have at least 1M ohm input impedance, more for more expensive voltmeters. So, this is pointless. (more) |
— | over 3 years ago |
| Edit | Post #277090 |
Post edited: small mistake |
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| Edit | Post #279431 | Initial revision | — | over 3 years ago |
| Answer | — |
A: How to plot the I-V curve of a tunnel diode? Don't put the "protective" series resistor: connect directly your regulated power supply to the diode (with a short wire) and measure the current: the voltage regulator is all what you need to protect the diode and ensures you are not missing the negative resistance part. Then you increase very slow... (more) |
— | over 3 years ago |
| Edit | Post #279278 |
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| Comment | Post #279228 |
@TonyStewart. What is calibrated torque? (more) |
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| Edit | Post #279278 |
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| Comment | Post #279280 |
I am always surprised I get downvotes for such questions: someone disagrees with this question ???????????????
someone hate me ??????????????? (more) |
— | over 3 years ago |
| Comment | Post #279250 |
@Lundin. I may have misunderstood your point. Are you suggesting to replace only the bullets mentioned in your question, or to replace the whole page? (more) |
— | over 3 years ago |
| Edit | Post #279280 |
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| Edit | Post #279280 | Initial revision | — | over 3 years ago |
| Question | — |
Creating an additional "user" That may seem a pointless question, but life has taught me to be careful and to ask before any "somewhat unusual" steps. Also, despite it could be a Codidact question, I think it is also dependent on the particular EE community feelings. I am currently using this site under the pseudonym "Coqueli... (more) |
— | over 3 years ago |
| Edit | Post #279278 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Homework questions / "ask an engineer". I think the bullet list in the current on-topic page is clearer and easier to understand. Admittedly, there are some "confrontal" bullets, but that's OK in my point of view. Sure, there are always very delicate persons who will be choked by the crudity of the terms. But is it bad? these QA sites w... (more) |
— | over 3 years ago |
| Edit | Post #279228 |
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| Comment | Post #279227 |
@Andy. Actually, in my answer, the analyzer output impedance of 50 ohm I've assumed and added inside the schematics (to the left) plays no role: everything is function of U1 alone, and the same results would hold if the output impedance at the s11 terminal had been something else. I think this impeda... (more) |
— | over 3 years ago |
| Comment | Post #279227 |
@Andy. Actually, our answers do not coincide for s21. You say that the expected s21 should be 0.5, but I've computed it should be 0.66... as indicated by the analyzer. Is there some mistake in my answer or yours? (more) |
— | over 3 years ago |
| Edit | Post #279228 |
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| Comment | Post #279227 |
Note: Actually, the analyzer displayed -9.28db at the marker position, as can be hardly seen (a ratio of 0.3435). I've incorrectly approximated with -9db in the question. (more) |
— | over 3 years ago |
| Comment | Post #279227 |
And as always, where I have to spend hours to understand the math, you just feel things, and you feel them right. (more) |
— | over 3 years ago |
| Comment | Post #279227 |
@Andy, we have written answers in parallel. I'm happy to see that your condensed answer coincides with mine. (more) |
— | over 3 years ago |
| Edit | Post #279228 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Understanding the s11 and s21 coefficients of a microstrip line with resistor to ground Eureka! thanks to the article cited in the question, I've finally understood the matter. I will describe here the general procedure for computing the network parameters of a grounded two port device (DUT), without entering into the intuition behind the math. The generalization to more ports is ea... (more) |
— | over 3 years ago |
| Comment | Post #279080 |
@Lundin. Admittedly, the "thing" looks bad, worse than it really is, because there are reflections and other image artifacts. But I am sure there is no short. I may do a more pretty circuit and post it this week when I am in my lab. On the other hand, if you already know how the s11 and s21 SHOULD lo... (more) |
— | over 3 years ago |
| Edit | Post #279080 |
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| Edit | Post #279080 | Initial revision | — | over 3 years ago |
| Question | — |
Understanding the s11 and s21 coefficients of a microstrip line with resistor to ground I thought I understood the theory of scattering parameters, smith charts etc. until I tried a practical example. The following stupid example is supposed to be a microstrip line shunted by two 100 Ohm resistors to ground, that is, an equivalent resistance of 50 Ohm (also checked at DC with a volt... (more) |
— | over 3 years ago |
| Comment | Post #279016 |
@circuit fantasist. After your updates, I now like this article. (more) |
— | over 3 years ago |
| Comment | Post #279050 |
@circuit fantasist. Yeah, as you could see, I've deleted my previous comment yesterday, where I said the Art of Electronics does not deal with this subject. On the contrary, the authors deal extensively with that. How have I missed that? I don't know but I am now studying this part thoroughly· (more) |
— | over 3 years ago |
| Comment | Post #279030 |
+1 for having pointing out that FET followers can be used advantageously to buffer small signals, where usually, only the AC part matters. They provide a nearly infinite input impedance to the signal, and the output can be passed through a cap. Good catch!
N.B: To present nicely math formulas, e... (more) |
— | over 3 years ago |
| Edit | Post #279018 |
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| Comment | Post #279018 |
You are right, I'll fix that. (more) |
— | over 3 years ago |
| Comment | Post #279016 |
I am not against the pot, but I think this should be written somewhere, preferably inside the schematic, something like: "light intensity signal simulated with potentiometer P" near the pot.
Regarding the schematics, I think adding the current loops in green is more than sufficient. The voltage dro... (more) |
— | over 3 years ago |
| Comment | Post #279016 |
@Circuit fantasist. I do not disagree that the pot is a good way of testing your circuit, but it is a fact that this makes your article difficult to follow. It took me a while to understand what the circuit is supposed to do!!!! You have only given a short hint as a historical account at the beginnin... (more) |
— | over 3 years ago |
| Comment | Post #279022 |
@Olin Lathrop. Thank you for your answer. So, should I understand it as : No use of FET followers in electrical engineering? Edit: I reformulate this question: do you see any reason to use a FET follower ?
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— | over 3 years ago |