Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #284542 | Initial revision | — | over 3 years ago |
| Answer | — |
A: React feature guidelines? I think "dangerous" is pretty clear. It's when doing as recommended can cause significant damage to property or health. For example, recommending to a hobbyist to make a direct line-connected capacitor charge pump power supply for powering his breadboard would qualify. Dangerous does not mean ... (more) |
— | over 3 years ago |
| Edit | Post #284541 |
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— | over 3 years ago |
| Edit | Post #284541 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Most correct term for radio switching noise? I don't think there is a formal term that means exactly what you describe. Switching transients generally means short term glitches that might cause noise, usually resulting from power being switched on or off. Note that this refers to the transients that cause the noise, not the noise itself. ... (more) |
— | over 3 years ago |
| Edit | Post #284538 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Find feedback of circuit You are asking about feedback in this circuit, and how R3 fits into that: First, note that the circuit is an emitter follower, and has a voltage gain less than 1. Second, R3 bypasses the transistor for most input voltages. The block diagram you show is usually meant to be used when the for... (more) |
— | over 3 years ago |
| Edit | Post #284514 | Question reopened | — | over 3 years ago |
| Comment | Post #284514 |
Explain how you think how the circuit works. In particular, I want to know what you think R3 does, and why it has the value it does.
Remember, we don't just answer homework questions here. We can help you thru the process or understanding a circuit, but that requires you to actively participate.... (more) |
— | over 3 years ago |
| Comment | Post #284514 |
You ask about feedback and gain. These make no sense without an input and output. Gain can only be from one specific place to another specific place. Don't be so sloppy. Also, tell us how you tried to solve this problem and where exactly you are stuck. (more) |
— | over 3 years ago |
| Edit | Post #284514 | Question closed | — | over 3 years ago |
| Edit | Post #284395 |
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— | over 3 years ago |
| Edit | Post #284395 |
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— | over 3 years ago |
| Edit | Post #284395 | Initial revision | — | over 3 years ago |
| Answer | — |
A: PTC resettable fuse leakage current That's a marketing blurb. Look at the real datasheet. I just checked a polyfuse datasheet, and see that there is usually only about a 2.5 to 3.0 ratio of trip current to hold current. That should be enough to keep the motor from overheating. Polyfuses work on heat. When cold, they have low r... (more) |
— | over 3 years ago |
| Edit | Post #284344 | Initial revision | — | over 3 years ago |
| Answer | — |
A: CAN "split" pin, bus termination and common mode stabilization Can anyone explain the theory behind this pin You have already done so yourself: used to give a common mode stabilization and thereby reduce radiated emissions As far as I know, that is exactly the reason. Since the CANH/CANL lines are supposed to be a twisted pair, radiation comes from the... (more) |
— | over 3 years ago |
| Edit | Post #284304 |
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— | over 3 years ago |
| Edit | Post #284304 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Driving PMSM machine as an AC induction machine A motor with stator winding and permanent magnets on the rotor, is very different from an AC induction motor. As a result, they require very different drive. You can just apply an AC signal to an induction motor, and there will be a net startup torque. The actual torque is a somewhat complicated... (more) |
— | over 3 years ago |
| Comment | Post #284282 |
This site has a wide audience, so you should define, or at the very least spell out PMSM and VFD. I know what they stand for, but if you spelled them out, particularly PMSM, you might notice yourself that PMSM and AC induction motor don't make sense together.
Step back and explain in more detail ... (more) |
— | over 3 years ago |
| Comment | Post #284253 |
@Joel: "parallel plate inductor" doesn't make much sense. (more) |
— | over 3 years ago |
| Comment | Post #283936 |
While you are technically correct, I think you're also being pedantic in this case. Given that there is no such thing as an ideal current source in reality, it seems clear enough that the switch and current source together are meant to be an open when the switch is open, and producing a fixed curren... (more) |
— | over 3 years ago |
| Comment | Post #284253 |
I read this twice and still don't know what your setup is and what exactly you are asking. You start out talking about a parallel plate capacitor. OK so far. But in the next paragraph there is something about an inductor, but that was not previously defined or introduced.
We can't know the assu... (more) |
— | over 3 years ago |
| Edit | Post #284253 | Question closed | — | over 3 years ago |
| Edit | Post #284238 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Change of pins in monostable multivibrator The circuit you show doesn't make any sense: Start by examining the steady state condition. In steady state, C1 is effectively an open, so you ignore it. R4 keeps Q1 on. That means the collector of Q1 will be low, which keeps the base of Q2 low, which means Q2 is off. The diode doesn't d... (more) |
— | over 3 years ago |
| Edit | Post #284219 | Question reopened | — | over 3 years ago |
| Comment | Post #284219 |
That's much better, and I wouldn't have closed it in its current state. However, since we're here, fix it the rest of the way. The junction dot to the right of C1 and below R4 is missing, V1 could be centered better, etc. Show me an example of neatness and attention to detail! Actually *try* to m... (more) |
— | over 3 years ago |
| Edit | Post #284225 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Quality control of the site There are four things we can do with bad or poorly written questions. In order of seriousness, these are: Leave a comment. Downvote. Close. Delete. The questions you mention have mostly been addressed with #1 and #2. Do you really think more severe measures are appropriate for th... (more) |
— | over 3 years ago |
| Edit | Post #284219 | Question closed | — | over 3 years ago |
| Comment | Post #284219 |
That schematic is too much of a mess to look at. There are too many unnecessary zig-zags, gratuitous "loopy" corners, and rails that are not straight. Asking others to look at this mess is downright rude. It is like writing two paragraphs in text-speek.
You've had plenty of warnings about slopp... (more) |
— | over 3 years ago |
| Comment | Post #284199 |
@Kran: Some questions *are* stupid. The OP isn't going to change without some reaction to that. In any case, if you think a question isn't answered well, write your own answer. We could use more good answers here, in addition to more questions. This site won't go anywhere if one person does most ... (more) |
— | over 3 years ago |
| Comment | Post #284199 |
@Kran: Yeah, these questions have been pretty lazy. I haven't been upvoting the lazy ones, and sometimes downvoting. We want to help students, but we also aren't here to read the datasheet to people. At this point in the life of this site, I'm being more tolerant and using these questions as a way... (more) |
— | over 3 years ago |
| Comment | Post #284207 |
There were two flags to close this question. I'm not going to close it, but don't be so lazy. This is almost certainly why you are getting downvotes. Look at a few datasheets yourself. If you don't understand what the datasheets are saying, then ask about that. (more) |
— | over 3 years ago |
| Edit | Post #284199 |
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— | over 3 years ago |
| Edit | Post #284199 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Capacitance of inductor What is a typical value for capacitance of a real inductor? "Typical" capacitance is a useless to design circuits with. It will also vary considerably by inductor size, geometry, and materials used. The only real answer is in the datasheet of whatever inductor you are considering using. There... (more) |
— | over 3 years ago |
| Comment | Post #284076 |
@Carl: Self-answered questions are allowed here. Of course a self-answered question should be the kind that someone else might reasonably run into, and both the question and answer must be well written, well presented, and correct. (more) |
— | over 3 years ago |
| Comment | Post #284074 |
Asking for the voltage of a "circuit" is meaningless. It's obviously 0 around any closed loop. It would make sense to ask about the voltage between two specific points, or across a specific component. (more) |
— | over 3 years ago |
| Edit | Post #284046 |
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— | over 3 years ago |
| Edit | Post #284046 |
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— | over 3 years ago |
| Edit | Post #284046 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Inductance vs frequency No. An inductance is an inductance. One way to look at an inductance is as an impedance that is a function of frequency: Zind = ωL = 2πfL Where Zind is the impedance magnitude of an inductance, ω and f the applied frequencies, and L the inductance. When &omega... (more) |
— | over 3 years ago |
| Comment | Post #283958 |
OK, but don't tell me here, <i>fix the question</i>. (more) |
— | almost 4 years ago |
| Comment | Post #283958 |
How coupling effects the series inductance is a good question, +1. However, it's ambiguous to talk about the inductance "of this circuit". Do you really mean the two inductors in series? Do you mean the inductors and resistor as view from the voltage source? (more) |
— | almost 4 years ago |
| Comment | Post #283956 |
No, 2(4/9) <b>is</b> dimensionless. That's what you wrote. (more) |
— | almost 4 years ago |
| Comment | Post #283956 |
Seriously!? Just read the whole post looking for errors. Obviously you haven't done this yet. (more) |
— | almost 4 years ago |
| Comment | Post #283956 |
Whether one can guess the units is not the point. It's still <b>just plain wrong</b> to equate a value of Volts to a dimensionless quantity. (more) |
— | almost 4 years ago |