Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #276306 |
"It" refers to the firmware or the execution. (more) |
— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #288720 |
Post edited: Updated tags to show this is now done |
— | over 1 year 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) |
— | over 1 year ago |
| Comment | Post #289161 |
If you want to expand on this, like adding a graph or two, it might make a good paper. (more) |
— | over 1 year 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) |
— | over 1 year ago |
| Comment | Post #288720 |
OK, thanks. --- (more) |
— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #283239 |
Post edited: Copied image into question to protect against link rot |
— | over 1 year 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) |
— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #288971 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288971 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Is there an easy way to measure the characteristic impedance of a cable using basic lab instruments? What you basically ask for can be done (I've done it), but not all your specific constraints can be reasonably met. The way to measure transmission line impedance is to drive a step onto the transmission line with a known resistance, while observing the waveform on a scope. During the time the st... (more) |
— | over 1 year ago |
| Edit | Post #288923 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Are a JFET's Idss and Vgs(off) values correlated? I'll let someone else answer about the device physics. I'll answer from an electrical engineering standpoint. The answer is: Maybe, but it doesn't matter since you should be considering worst case in your design anyway. You are really asking whether there is any correlation between the gate vo... (more) |
— | over 1 year ago |
| Edit | Post #288853 |
Post edited: |
— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #288874 |
Post edited: Removed annoying time-wasting fluff. Read the rules already! |
— | over 1 year ago |
| Edit | Post #288877 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Floating circuitry and diodes is the "X" point floating when there is no 12V applied ? Perhaps over a limited range, depending on whether the 12V line is left open or connected to something other than 12V. Case 1: The voltage on X is bounded by the Zener diode. X can't be more than one diode drop below ground, or th... (more) |
— | over 1 year ago |
| Edit | Post #288853 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Choosing between common-drain JFET amplifier, and common-source The first circuit uses the FET in follower mode. That means it works as an impedance buffer with a gain a little below 1. Such configuration can be useful to turn a high impedance signal into a low impedance signal. The second circuit uses the FET as a common source amplifier. This inverts the ... (more) |
— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #288784 |
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— | over 1 year ago |
| Edit | Post #288784 |
Post edited: |
— | over 1 year ago |
| Comment | Post #288784 |
This is getting off the topic of this question, and is better addressed in a separate question. (more) |
— | over 1 year ago |
| Edit | Post #288784 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288784 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Ground pour on outer layers on 4-layer PCB I would not do deliberate ground pours on a board like that. It's relatively small, and not exceptionally high frequency. I also wouldn't try to guess what effect or not it might have on the board fab process. I've put similar microcontrollers on larger boards many times and not had any issues l... (more) |
— | over 1 year ago |
| Edit | Post #288757 | Initial revision | — | over 1 year ago |
| Answer | — |
A: How to convert dv/dt of noise into frequency for filter capacitor selection? It looks like you've sort of re-discovered a motivation for Fourier analysis. The difference between looking at slope versus frequency content is exactly the difference between time domain and frequency domain analysis. Both are perfectly valid and provide the same ultimate answers. However, one o... (more) |
— | over 1 year ago |
| Edit | Post #288740 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288740 |
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— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #288740 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Should posting on Meta affect reputation? Yes, votes on meta should not factor into rep. Meta downvotes indicate disagreement, not that you're a terrible person, have the IQ of a garden slug, and cast dispersions on your heritage like they do on the main site ;-) Users should be free to express their opinions, whether popular or not, as ... (more) |
— | over 1 year 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) |
— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #288708 | Initial revision | — | over 1 year ago |
| Answer | — |
A: High power LC circuit with programmable resonant frequency What you are asking for is totally unrealistic, and your numbers don't add up. With 10 mH and 80 µF, the resonant frequency is 178 Hz. Getting down to 1 Hz even with 10 mH would require over 2.5 F. Keep in mind that with the inductance fixed, the capacitance required for resonance is inver... (more) |
— | over 1 year ago |
| Edit | Post #288652 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Titanic submarine control considerations I don't have any special knowledge about how submarines get controlled, so this is mostly speculation. I expect that the actual controls are fine. There seem to be the necessary degrees of freedom, and as you say, people are already familiar with the interface. In that sense I don't see anything... (more) |
— | over 1 year 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) |
— | over 1 year ago |
| Comment | Post #288550 |
@Lundin You should make this an answer. This information doesn't belong in a comment. (more) |
— | over 1 year ago |
| Edit | Post #288515 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Sensing 3 states in a single mcu pin using firmware Starting with your first circuit: It seems a little klunky, but should work. I don't like the D1 and D2 diodes. The reason I placed D1 is to avoid triggering the mosfet with very low voltage like 2V to 4V. Is D2 really necessary? The input voltage threshold for sensing high is the 8.2 V... (more) |
— | over 1 year ago |
| Edit | Post #288474 | Initial revision | — | over 1 year ago |
| Answer | — |
A: How to change the polarity of an input using a single switch? The difference between your two options is which polarity the input floats to when left open, and whether there is an overall inversion. Adding the inversion in the firmware would require one more pin from the chip. Not necessarily. I was envisioning inversion or not would be specified by conf... (more) |
— | over 1 year 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) |
— | over 1 year ago |