Activity for coquelicot
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #279016 |
@circuit fantasist. What makes this paper unclear is that you have replaced the light signal (to be compared) by a pot, probably for the sake of visualization? It took me a while to understand that, and the confusion with the "references voltage". My suggestion is: remove the pot and put a single ent... (more) |
— | over 3 years ago |
| Comment | Post #278933 |
A tinkerer solution, probably not standard EE. But that's what I am, after all, a tinkerer. So I give you a +1 for the simplicity of this circuit. I would have done it in a somewhat "more standard" way with the battery connected to the Vcc+ via a diode, and the base of the transistor driven by an R-... (more) |
— | over 3 years ago |
| Comment | Post #278877 |
@circuit fantasist. I'm not sure I've understood (a schematic would have help), but I think this is related to the first section Debouncing in the link in the comment of Peter Mortensen just above. Maybe you can pick fig. 1 p. 11 of this document and insert it into your answer, or say something about... (more) |
— | over 3 years ago |
| Comment | Post #278793 |
@Olin. Thanks. Actually, the downvote is not what really imports for me (especially here). I just want to know why I'm being downvoted in this seemingly innocent post about a detail (am I stupid or missing something?). (more) |
— | over 3 years ago |
| Comment | Post #278793 |
Either I'm missing something, or the anonymous person with the comment above is missing something, or he dislikes the way I've initiated the discussion, or my browser is not working well. His answer and downvote do not help much to know. (more) |
— | over 3 years ago |
| Comment | Post #278756 |
@concerned citizen. I like your answers. They provide the theoretical part that is hardly given in other answers. (more) |
— | over 3 years ago |
| Comment | Post #278766 |
+1 for this very interesting answer. I ignored that there are mandatory tests for ESD with guns (well, in fact, I never thought about that). (more) |
— | over 3 years ago |
| Comment | Post #278720 |
@Lundin. I fully agree with you : time estimate HAS to be done by someone with domain experience (this is also an obvious consequence of my "rule 2"). But you know, so many things have to be done and are not, or are too hard to be. (more) |
— | over 3 years ago |
| Comment | Post #278707 |
Let be honest, there may be good surprises as Lundin said, but in general, if you don't consider competitors, sooner or later you are dead. This does not contradict the "honest assessments" claim of Olin though. My opinion is that you should be as competitive as possible, as far as you remain inside ... (more) |
— | over 3 years ago |
| Comment | Post #278720 |
But when it comes to how evaluate the task "per se", all the answers invoke "experience", or "ask someone with experience". This is often not practical, especially for new entrepreneurs. This is where the rule I've given in my answer, and that I've statistically verified on me and others, could be us... (more) |
— | over 3 years ago |
| Comment | Post #278720 |
+1 for this answer, the best one in that it entirely focuses on time, while the other answers contain (good) things out of topics. Yours contains also practical advices. All the answers (except mine) describe in fact how to predict and manage the product development stages, what I summarized too quic... (more) |
— | over 3 years ago |
| Comment | Post #278703 |
Thank you, that helps! (more) |
— | over 3 years ago |
| Comment | Post #278703 |
Who has downvoted this answer? I usually don't ask this question, but it's so incredible to be downvoted for an answer to a question of this level of generality, and that is a matter of experience, that I cannot prevent myself. In addition my answer is much similar to that of Olin that has got 2 poin... (more) |
— | over 3 years ago |
| Comment | Post #278617 |
@LvW. There are too much things in you edit to be dealt here, ranging from incorrect statements to biased philosophical complaints. I think this has more or less been dealt by Olin in his answer. This QA site is not appropriate for discussions, and I'm not sure I'm interested anyway. Just an advice: ... (more) |
— | over 3 years ago |
| Comment | Post #278670 |
@Olin. I read your articles with avidity, even if that's in the digital domain, of which I know almost nothing. Regarding the paragraph "in some rare cases...", maybe they are just the cases where it may be judicious to pass the switch operation with an analog Schmitt trigger, as you've described pr... (more) |
— | over 3 years ago |
| Comment | Post #278630 |
Maybe you have to learn to cancel common factors in numerator and denominators of fractions. Here is the rule: ac/bc = a/b. In our case, c is just the exponential term, hence it vanishes. I definitely stop here. (more) |
— | over 3 years ago |
| Comment | Post #278630 |
@LvW. Not 60%, but 100% of the relevant published sources speak about the Ebers-Moll model, as it is absolutely necessary to explain finest effects. That's not the point of your question and you know that. The last line is not a correlation, but the exact meaning of "transistors are, under general co... (more) |
— | over 3 years ago |
| Comment | Post #278614 |
@a concerned citizen. Nice, I finally got a real answer to my question (I will now work it more closely). Admittedly, that's complicated (a chance I am a mathematician). But that is what I originally wanted. Regarding the XY problems, they tend to focus too much on them, and to give them too much imp... (more) |
— | over 3 years ago |
| Comment | Post #278630 |
@LvW. See my edit. And unless you and your friends are about 60% of the EE in the planet, you are wrong. (more) |
— | over 3 years ago |
| Comment | Post #278614 |
Yes, you are right, I missed that (decibels fooled me). Not what I originally desired. I am still curious about the other things though. (more) |
— | over 3 years ago |
| Comment | Post #278630 |
@Circuit fanstasist. This is not "my thoughts" but the thoughts of 99.999% of the EE on the planet. Regarding the rest, see my edit in the question. (more) |
— | over 3 years ago |
| Comment | Post #278614 |
Your answer is great from the practical point of view, but I don't know how you arrived to these design rules (I mean, number of stages etc.), which was the essence of the question. What calculator did you use that allowed you to arrive to those results ? is it available freely? If you can elaborate ... (more) |
— | over 3 years ago |
| Comment | Post #278614 |
What a magnificent answer! I'm even surprised: it now appears that this is quite possible: I would choose the elliptic 6 stage elliptic II with 1-2 mv ripple, with banal 1% resistors and 5% cap!!!
In your answer, I don't know what you mean by CGIC: is it an IC or the name of a filter? Also, what d... (more) |
— | over 3 years ago |
| Comment | Post #278604 |
I've read your answer 2 times and have understood nothing. More specifically, your approach necessitates a good deal of visual information to make things intuitive, which is your mission. I would suggest to add schematics, a lot of schematics, inside your answers, in order to illustrate your ideas. (more) |
— | over 3 years ago |
| Comment | Post #278604 |
@Circuit fantasist. Basically, I like your point to present and explain electronics from another angle; unfortunately it's an art and a gift given to few persons. When I was teaching math at the university, I thought once to do something similar; this was a fiasco, and that made me understand why the... (more) |
— | over 3 years ago |
| Comment | Post #278475 |
Sounds like I made everyone angry, by trying to improve things. What a mess! definitely too much for me, I leave. (more) |
— | over 3 years ago |
| Comment | Post #278475 |
@Andy. If you wish, you can do the following experiment: take an ordinary computer PSU and try to filter the noise at the output. You'll see.
Regarding your other remarks, I will think about. (more) |
— | over 3 years ago |
| Comment | Post #278475 |
@Andy. This contradicts my experiments. Sure, in theory, you are right: ground is ground. But in my experiments on desktop computer ATX PSUs, I've observed that ground is a fiction. These PSU are so inherently noisy in the high frequency range that a common mode noise arrive SOMEHOW to the terminals ... (more) |
— | over 3 years ago |
| Comment | Post #278477 |
@Andy, as I said, I was in the darkness. I felt that at some point, when I said "let's leave that". I've edited the 3 last lines of my question to be fair with the answer of Olin. Hope this is more acceptable. (more) |
— | over 3 years ago |
| Comment | Post #278477 |
@Olin. Please, consider deleting your last edit, or delete the whole post if you wish: This degrades unfairly your answer that was perfectly valid in my point of view. (more) |
— | over 3 years ago |
| Comment | Post #278477 |
@Olin. You are completely wrong, your answer is a legitimate answer to my question, and I'm sad you feel like this. I've edited my question to focus on that particular point because Andy asked me to do that, and because it is not dealt in your answer (that's the ironic point). I was vaguely aware tha... (more) |
— | over 3 years ago |
| Comment | Post #278475 |
@Andy. See my edit. (more) |
— | over 3 years ago |
| Comment | Post #278477 |
So, your answer is nothing, or at most a linear post-regulator. I thought there is more than that but OK. (more) |
— | over 3 years ago |
| Comment | Post #278417 |
I am currently doing research about biological effects involving high voltage, magnetic fields and microwaves. My aim is to demonstrate the effect with a prototype and then to create a startup. So, I develop my projects dynamically, and I just anticipated that micro controllers may be a useful tool i... (more) |
— | over 3 years ago |
| Comment | Post #278465 |
@Olin. Always a pleasure to read the masters. Could you elaborate a bit about "At high frequencies, the return currents in the ground plane actually follow the path of the outgoing currents in X and Y etc." it's not very clear to my mind of poor mortal. (more) |
— | over 3 years ago |
| Comment | Post #278421 |
@Lundin. My common sense says this is not a matter of war, it's all about money. True professionals always want to minimize the price of their products, and choose the cheapest micro controller that can fit the required task (is ARM cheaper than all what exists on the market ?). So, what Olin says ma... (more) |
— | over 3 years ago |
| Comment | Post #278421 |
@Olin. Your reaction to the answer of Lundin is again instructive for me (thx). Of course, I knew his opinion about Raspberry an Arduino was a bit extremist, as you can understand from my humorous comment. Yet, I think his answer contains very good things. Also, I believe when he says that Modern 32 ... (more) |
— | over 3 years ago |
| Comment | Post #278421 |
@Lundin. Thank you so many for your help and comments. Things are now much clearer for me. (more) |
— | over 3 years ago |
| Comment | Post #278421 |
@Olin thx. I am now convinced that I should use micro controllers. The problem is there is no general purpose one (according to the answers here). This makes things even more complicated for me. Regarding the "moderator note", I don't know what to do about that: do you want I edit the question (thi... (more) |
— | over 3 years ago |
| Comment | Post #278420 |
Wow, now the situation is even more complicated for me; you killed my hopes (a chance that I was not depressive today, otherwise you would have killed me too :-) ). +1 and thanks for this really good and elaborated answer. (more) |
— | over 3 years ago |
| Comment | Post #278355 |
@Lundin. You say a Schottky from Vout to Vin. I did put a normal diode between Vout to Vin but this did not prevent the part to fry. Do you think a Schottky better protects the part than a normal diode ? (more) |
— | over 3 years ago |
| Comment | Post #278354 |
@Olin. The circuit I showed was only an illustration of what is a usual return path to ground (see the ":" before the image). The bootstrap technique is already illustrated by the images in the question and in your answer. I'll probably take into account your remark and edit this answer though. (more) |
— | over 3 years ago |
| Comment | Post #278344 |
Thank you for your answer Andy. Curiously, this is more or less what I tried to do. But I think this time, Olin was right: there is a limit of what is possible to do with analog electronics: Even a 9th order elliptic filter would not give me the required spec. Only a Fourier transform performed on a ... (more) |
— | over 3 years ago |
| Comment | Post #278193 |
@Olin. The field mill is interesting and I was unaware of it. But as far as I understand, it is not well suited to my needs (especially its physical aspect). The electrostatic field meter I've conceived and built is interesting because it is extremely simple and handy, can give very precise measureme... (more) |
— | over 3 years ago |
| Comment | Post #278193 |
@Olin. Thank you for having updating your answer. Of course, I was perfectly aware that with a faster rotation speed, I could filter the noise easily. Unfortunately, my budget is restricted and I do everything by myself. In particular, I have to cope with the material I have in my lab: Modifying the ... (more) |
— | over 3 years ago |
| Comment | Post #278193 |
@Lundin. Thank you for helping me. The power supply is two 9V batteries inside a metal box (all the electronics is included inside the box to avoid main pickup, and the wire to the probe is a USB shielded wire). The problem is not the noise from the power supply, but the noise picked up by the extrem... (more) |
— | over 3 years ago |
| Comment | Post #278193 |
@olin. Thank you for trying to help me. Indeed, the 50-60Hz noise comes from ambiant capacitive coupling of my fieldmeter probe with the near power lines. Unfortunately, I have to amplify the tiny signal out of the probe and the noise is amplified as well. The fieldmeter works very well, but the 50Hz... (more) |
— | over 3 years ago |
| Comment | Post #278192 |
Regarding currents, see my edit, no (4). Regarding the bandpass filter, I think it is always more complex than a high pass filter, so I've not precised that. But if that can help, I don't need more than 110 Hz (that is, the band would be 90Hz-110Hz). (more) |
— | over 3 years ago |
| Comment | Post #278066 |
@Olin. Regarding "What is the amplitude of the sine generator output? That divided by 200 kΩ should be the current out of the sine generator with C1 removed." This is what occurs: 1V / 200 KOhm = 5uA. That is, I may have confused you when I said "as previously", I meant "as in the previous simulation... (more) |
— | over 3 years ago |
| Comment | Post #278066 |
@Olin, I have serious doubts regarding the capability of LT spice to simulate faithfully the behavior of oamps. Thinking about, I'm not certain that this simulation has to be taken too seriously. This may explain some incoherences. (more) |
— | over 3 years ago |
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