Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #289577 |
@#56656 See addition to answer. (more) |
— | 8 months ago |
| Edit | Post #289577 |
Post edited: |
— | 8 months ago |
| Edit | Post #289577 | Initial revision | — | 8 months ago |
| Answer | — |
A: Soft-start circuit behaviour First, let's redraw your schematic so that it's not so annoying to look at. High voltages go at top, low voltages at bottom, and logical flow left to right: This is not a great soft-start circuit since it relies on unspecified behavior of the FET. It seems the strategy is to low pass filter ... (more) |
— | 8 months ago |
| Edit | Post #289543 | Initial revision | — | 8 months ago |
| Answer | — |
A: Can the corner frequency of thermal noise change with change in source impedance? The thermal noise of a resistance depends only on that resistance. However, there is always some parasitic capacitance. That capacitance against the resistance causes a low pass filter. So in a sense, yes, the frequency content of thermal noise does vary with resistance in the real world due to ... (more) |
— | 8 months ago |
| Edit | Post #289530 | Initial revision | — | 8 months ago |
| Answer | — |
A: Power switches and automotive load dump, unclamped It seems you want to protect a device against power spikes. The power supply is nominally 12 V, but can have spikes up to 79 V with an impedance of 500 mΩ. Two timing values were given, but they are useless without being defined, so we can only ignore them. The device can draw up to 200 mA. ... (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 |
| Edit | Post #289504 | Initial revision | — | 9 months ago |
| Answer | — |
A: Professional vs Hobbyist advice and potentially dangerous projects the original question is interesting and deserves a technical answer So go write one. That's your call, just like it's mine not to. We are all volunteers here, and are therefore never obligated to answer anything. I didn't answer with technical details because: I don't know all the specs f... (more) |
— | 9 months ago |
| Edit | Post #289477 | Initial revision | — | 9 months ago |
| Answer | — |
A: What is Ground Electrode in EMG? When measuring signals at different points on the skin of the body, you don't usually want to connect the victim patient to ground. Usually you use an extra electrode connected some distance away that is driven by the circuitry to the average of the other signals. That reduces the common mode range... (more) |
— | 9 months ago |
| Edit | Post #289475 | Initial revision | — | 9 months ago |
| Answer | — |
A: Essential safety features of an EMG/medical grade device? Safety of medical devices is not something you should be asking random folks on the internet about. The rules are stringent, for good reason. The clearance and creepage distances to line voltage, insulation voltage, leakage, and other specs are much tighter than for ordinary consumer devices. Be... (more) |
— | 9 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) |
— | 9 months ago |
| Edit | Post #289398 | Initial revision | — | 9 months ago |
| Answer | — |
A: How to deal with design review questions? I agree with this approach. Categories should only be created when they are expected to have reasonable traffic. A category with only chirping crickets is an anti-advertisement. Take a look at the Photography and Outdoors sites. They have lots of nearly unused categories, which I think makes th... (more) |
— | 9 months ago |
| Edit | Post #289397 | Initial revision | — | 9 months ago |
| Answer | — |
A: Disabling breakpoints in real-time section of firmware I have a similar problem when debugging firmware on a dsPIC that drives a flyback power supply. The switch isn't designed to be on for very long, as eventually the inductor saturates. Usually the transistor blows out when it is left on too long. In normal operation, the PWM hardware in the micro g... (more) |
— | 9 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) |
— | 9 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) |
— | 9 months ago |
| Edit | Post #289345 | Question closed | — | 9 months ago |
| Edit | Post #289285 |
Post edited: |
— | 9 months ago |
| Edit | Post #289285 | Initial revision | — | 9 months ago |
| Answer | — |
A: Tag naming guidelines. Adding to what Lundin said (+1): s is seconds, S is siemens (1/Ω). What we write here is inherently HTML. Greek characters like µ and Ω are defined as HTML entities, and can always be written with "µ" and "Ω", respectively. There is therefore no e... (more) |
— | 9 months ago |
| Edit | Post #289209 | Initial revision | — | 9 months ago |
| Answer | — |
A: Two way circuit breaking capability for ideal diode controllers The two ICs you reference don't do the same thing. The first sentence of the first datasheet says: The MAX16141/MAX16141A ideal diode controllers provide system protection against a variety of system faults, such as reverse current, reverse voltage, overcurrent, input overvoltage/undervoltage, ... (more) |
— | 9 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 |
| Edit | Post #288720 |
Post edited: Updated tags to show this is now done |
— | 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 |
| Edit | Post #283239 |
Post edited: Copied image into question to protect against link rot |
— | 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 |
| Edit | Post #288971 |
Post edited: |
— | 10 months ago |
| Edit | Post #288971 | Initial revision | — | 10 months 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) |
— | 10 months ago |
| Edit | Post #288923 | Initial revision | — | 10 months 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) |
— | 10 months ago |
| Edit | Post #288853 |
Post edited: |
— | 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 |
| Edit | Post #288874 |
Post edited: Removed annoying time-wasting fluff. Read the rules already! |
— | 10 months ago |
| Edit | Post #288877 | Initial revision | — | 10 months ago |