Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #291215 |
Make it readable, with properly defined axes. I see Andy has given you some suggestions. I'm not going to repeat basic presentation lessons you should have learned in grade school. (more) |
— | 25 days ago |
| Comment | Post #290863 |
No. You didn't supply what was asked for. This question really should have been closed originally due to lack of information. I'll go fix that now. (more) |
— | 2 months ago |
| Comment | Post #290874 |
I think keeping the electrodes clean will be a problem. Gold should be inert enough, even in seawater. But the chlorine in the salt has a way of getting into everything eventually. Soldermask might survive long term in clean water, but I'd really want to do accelerated aging tests before expecting... (more) |
— | 2 months ago |
| Comment | Post #290874 |
Do you really only need to know whether the water is up to a certain level, or are you ultimately trying to sense the level. If the latter, there are some technologies you might not be aware of. A company I work for specializes in measuring levels in tanks, and things like the draft of ships. We h... (more) |
— | 2 months ago |
| Comment | Post #290863 |
What you are asking can't be answered without knowing the purpose of each connection to ground. We need to see both the layout (which you provided) and the schematic. (more) |
— | 2 months ago |
| Comment | Post #290785 |
@#8062: <i>"initially it could provide 10-15 minutes of runtime"</i>. Where did you see this? I looked all over for such a spec, but didn't find it. I checked in the user manual and on the web page the device was sold from. The web page just has a dash where the runtime would be (see above), and ... (more) |
— | 2 months ago |
| Comment | Post #290779 |
@#8049: Yes, there is more to it than just Ah capacity. However, it's a start, and I was trying to keep things simple. (more) |
— | 2 months ago |
| Comment | Post #290720 |
You are assuming the domed buttons are capacitive switches. Maybe they are, but I wouldn't rule out that they are simple mechanical contacts. In all the products I've worked on that had these kinds of domed buttons, they were just switches. The on-resistance was up to about 200 Ω or so. I c... (more) |
— | 3 months ago |
| Comment | Post #290541 |
Yes, if you isolate the TX and RX signals, then you get around the bi-directional problem. Now you have to isolate at each interface to the bus, though. (more) |
— | 3 months ago |
| Comment | Post #290499 |
That literally translates to "music closet", which seems to mean a stand-alone cabinet with assorted audio gear. Apparently that includes a radio, at least in your case. (more) |
— | 4 months ago |
| Comment | Post #290499 |
What's a "hifi sideboard"? (more) |
— | 4 months ago |
| Comment | Post #290448 |
I'm not following all your calculations, but I can see that you are not carrying units properly thru all the computations. In several places you show dimensionless quantities on one side of an equation, with units inexplicably appearing on the other side. That's clearly wrong.
Don't be so sloppy... (more) |
— | 4 months ago |
| Comment | Post #290416 |
Actually the nominal difference from CANH to CANL is only 1.8 V with the bus in dominant state. In any case, I wasn't suggesting to run the LED directly off the CAN bus. I was expecting the other end of the resistor driving a transistor or something. I assumed the OP was planning that considering ... (more) |
— | 4 months ago |
| Comment | Post #290354 |
Those ICs don't usually make +-12 V, even with 5 V in. They usually have a two-stage charge pump, so you'll get +-10 V minus a little loss. (more) |
— | 5 months ago |
| Comment | Post #290284 |
The analog filter rolloff is around 9 Hz, so 60 Hz should be about 16 dB down. Power frequency here in North America is 60 Hz. There will always be some power line noise, but shouldn't effect settling time. (more) |
— | 5 months ago |
| Comment | Post #290284 |
Errors in software are always possible, but the same software exhibits much longer settling times at lower resistances, and these vary by capacitor. (more) |
— | 5 months ago |
| Comment | Post #289688 |
Too much hand waving, too little schematic. I think I know what's going on, but don't want to decipher the word soup to understand the circuit. (more) |
— | 7 months ago |
| Comment | Post #289577 |
@#53033 See addition to answer. (more) |
— | 8 months ago |
| Comment | Post #289635 |
I'll reopen the question now that you have added definitions and references. (more) |
— | 8 months ago |
| Comment | Post #289577 |
@#53033 It was easy to create once I decided to regulate the slope of the internal power voltage. After that it's just make a slope detector with feedback to reduce the slope if it's measured too high. The topology falls out from that.
One issue is that I really wanted to limit current inrush. ... (more) |
— | 8 months ago |
| Comment | Post #289635 |
Too many undefined variables, abbreviations, and missing context. (more) |
— | 8 months ago |
| Comment | Post #289577 |
@#56656 See addition to answer. (more) |
— | 8 months ago |
| Comment | Post #289528 |
It's not clear what this 60 Ω dynamic resistance is you're talking about, nor how you intend to hook up everything. (more) |
— | 8 months ago |
| Comment | Post #287197 |
@#56656 I totally forgot about this. This post is so old that it's not worth it anymore. I still haven't looked up mathjax, and the answer to the original question is apparently *"no, it really is messy"*. (more) |
— | 8 months ago |
| Comment | Post #289395 |
He's trying to make an LED flash. That means he needs intense light for a short time. It's quite valid to run the LED at its pulse limit instead of steady limit for short times and low repetition rates. That's what the pulse spec is for. (more) |
— | 8 months ago |
| Comment | Post #289345 |
This is a link-only question. All essential parts of a question must be here in the question itself. Assume the volunteers you want to answer the question won't follow links unless they are to datasheets or the like. (more) |
— | 8 months ago |
| Comment | Post #289186 |
Yes. That applies to both up and down votes. (more) |
— | 9 months ago |
| Comment | Post #289204 |
Nicely thought out, well done. (more) |
— | 9 months ago |
| Comment | Post #276306 |
"It" refers to the firmware or the execution. (more) |
— | 9 months ago |
| Comment | Post #289183 |
Or, maybe it's just because we removed meta votes from affecting your rep (as it should have been all along). (more) |
— | 9 months ago |
| Comment | Post #289161 |
What you did was fine. I just want to put in everyone's mind that whenever you think of writing a self-answered question like this, you should consider making it a paper instead. I realize people are not used to this from other platforms. (more) |
— | 9 months ago |
| Comment | Post #289161 |
If you want to expand on this, like adding a graph or two, it might make a good paper. (more) |
— | 9 months ago |
| Comment | Post #277272 |
I create the schematic in Eagle, then export it in black and white at 600 DPI. I then run a script which shrinks and filters that image down by a factor of 6. That is the image I upload to the site.
By starting with 600 DPI and shrinking the resulting image, I get a nicely anti-aliased 100 DPI i... (more) |
— | 9 months ago |
| Comment | Post #288720 |
OK, thanks. --- (more) |
— | 9 months ago |
| Comment | Post #288720 |
It's been a month. A few people agreed, and nobody objected. Most probably rolled their eyes and thought *Why do I have to get involved with this? Can't they just get it done?"*".
So lets do it. This is a great example of something that should simply have been done because it makes sense witho... (more) |
— | 9 months ago |
| Comment | Post #289054 |
Not so fast. Using RF does have more complexity than wires, but that complexity is all implemented in solid state electronics with no moving parts. Once it's working, it should stay working with the only operational wear being vibrations and shock, just like the rest of the electronics.
Wires ha... (more) |
— | 9 months ago |
| Comment | Post #288985 |
Nowadays, you'd try to do that with high speed digital, multiplexing the various signals. I haven't specified a cable harness anything like that in such a long time that I have no idea what is customary with many-wire harnesses these days. (more) |
— | 10 months ago |
| Comment | Post #288874 |
Everyone would have to give their individual reasons, but here are a few that pop out at me:<ol>
<li>The lazy screenshot dump. You didn't bother to properly export the schematic to an image, fix up the image, then post that. The multiple colors and background dots are annoying.
<li>Poor descr... (more) |
— | 10 months ago |
| Comment | Post #288844 |
Those opamp links don't go to datasheets. They go to some product page that asks me to accept cookies. No thanks. (more) |
— | 10 months ago |
| Comment | Post #288784 |
This is getting off the topic of this question, and is better addressed in a separate question. (more) |
— | 10 months ago |
| Comment | Post #288641 |
I don't see anything wrong with a question that was prompted by current events, as long as it asks about real EE issues like design tradeoffs. In my opinion, this question meets those criteria. (more) |
— | 10 months ago |
| Comment | Post #288688 |
Tell us what you ultimately want to achieve, not how you imagined to go about it. All you've said is that you want to *"generate strong magnetic fields"*. Driving an electro-magnet does not necessarily require resonance. Maybe a class D amp? "Strong" is a useless spec, so we have no idea of what ... (more) |
— | 10 months ago |
| Comment | Post #288641 |
What's with the downvotes? This question is well written, to the point, uses pictures well to illustrate the point, and is a legitimate question prompted by current events. It's not asking a user-level question about a game controller, but design issues that make products suitable for different use... (more) |
— | 10 months ago |
| Comment | Post #288550 |
@Lundin So say that in an answer. It's OK to answer with speculative information as long as it's labeled as such. I don't want the information to get lost here in a comment chain. Comments are not for content. (more) |
— | 10 months ago |
| Comment | Post #288550 |
@Lundin You should make this an answer. This information doesn't belong in a comment. (more) |
— | 10 months ago |
| Comment | Post #288440 |
It seems you want to be able to invert the sense of an input into a microcontroller. Why not do the inversion in the firmware? There should be no need for hardware polarity flipping. (more) |
— | 10 months ago |
| Comment | Post #288222 |
I don't know what other form you've seen pots in, but a rotating shaft is very common. In any case, you need to fix the question. (more) |
— | 11 months ago |
| Comment | Post #288222 |
No, those are pots (potentiometers). You even label them yourself as <i>variable resistors</i>. Remember, this is an <i>analog</i> computer. Switches are digital. (more) |
— | 11 months ago |
| Comment | Post #288222 |
I looked at your full image carefully, and the only rotary switch selects one of three frequency ranges for the built-in square wave generator. The silver-colored 10-turn knob above the rotary switch provides the fine adjustment. I see no rotary switch where <i>"set the rotary switch to multiply th... (more) |
— | 11 months ago |
| Comment | Post #288163 |
We need to see exactly what you connected to this chip. Show the schematic. It would also help to provide a link directly to the datasheet of the chip. (more) |
— | 11 months ago |