Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Answer | — |
A: Can I make an AC inductor (reactor) rated 75mH 40A from a 3-phase induction motor? An induction motor with its shaft held still will mostly look like an inductor with a series resistance electrically. However, there will be some issues: It will be difficult to guess the inductance from the motor datasheet. There will probably be higher effective series resistance than for a ... (more) |
— | about 1 year ago |
| Edit | Post #289853 |
Post edited: |
— | about 1 year ago |
| Edit | Post #289862 | Initial revision | — | about 1 year ago |
| Answer | — |
A: Will shorting a lithium ion battery cause an explosion? Since you seem to be asking about whole batteries, not individual bare cells, dangerous effects should be limited. Consumer batteries made from lithium cells almost always include integrated protection circuits. These prevent over-charging, too deep discharge, and probably also mitigate shorts some... (more) |
— | about 1 year ago |
| Edit | Post #289853 | Initial revision | — | about 1 year ago |
| Answer | — |
A: What are some best practices for library management? I don't know about "best practices", but I make all my own library parts. I use Eagle, and the library parts that come with Eagle are quite inconsistent in things like pad shapes, what is shown on the silkscreen, size of lines and text, what goes into the various layers, etc. It might be tempti... (more) |
— | about 1 year ago |
| Edit | Post #289801 | Initial revision | — | about 1 year ago |
| Answer | — |
A: derating MLCC ripple current for transient current spikes how much higher can i go in current ripple RMS None, of course, at least if you want to rely on anything else the datasheet says. The heating is a function of the RMS current. No, you don't get to cheat physics. Calculate the RMS of the pulse waveform, and make sure that doesn't exceed what t... (more) |
— | about 1 year ago |
| Edit | Post #289710 | Initial revision | — | about 1 year ago |
| Answer | — |
A: Burned Source Driver - Noise Spikes from Relay Coil At first this sounded like it might be a classic case of forgetting the flyback catch diode across the relay coil. However, now that you've posted a schematic we can see that a diode is built into the driver chip for each output. That leaves two possibilities I can think of, power overload and gr... (more) |
— | about 1 year 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) |
— | about 1 year ago |
| Comment | Post #289577 |
@#53033 See addition to answer. (more) |
— | about 1 year ago |
| Edit | Post #289577 |
Post edited: |
— | about 1 year ago |
| Edit | Post #289635 | Question reopened | — | about 1 year ago |
| Comment | Post #289635 |
I'll reopen the question now that you have added definitions and references. (more) |
— | about 1 year 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) |
— | about 1 year ago |
| Comment | Post #289635 |
Too many undefined variables, abbreviations, and missing context. (more) |
— | about 1 year ago |
| Edit | Post #289635 | Question closed | — | about 1 year ago |
| Edit | Post #289621 | Initial revision | — | about 1 year ago |
| Answer | — |
A: What residential wiring questions are on-topic here? Thanks for asking. In my view, if it's something you'd first think of asking an electrician, it's probably off topic here. That includes what type of cable to use, whether it should be in a conduit or not, working with breaker panels, what size wire is needed for a particular application, etc. T... (more) |
— | about 1 year ago |
| Comment | Post #289577 |
@#56656 See addition to answer. (more) |
— | about 1 year ago |
| Edit | Post #289577 |
Post edited: |
— | about 1 year ago |
| Edit | Post #289577 | Initial revision | — | about 1 year 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) |
— | about 1 year ago |
| Edit | Post #289543 | Initial revision | — | about 1 year 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) |
— | about 1 year ago |
| Edit | Post #289530 | Initial revision | — | about 1 year 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) |
— | about 1 year 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) |
— | about 1 year ago |
| Edit | Post #289504 | Initial revision | — | about 1 year 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) |
— | about 1 year ago |
| Edit | Post #289477 | Initial revision | — | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #289475 | Initial revision | — | over 1 year 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) |
— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #289398 | Initial revision | — | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #289397 | Initial revision | — | over 1 year 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) |
— | over 1 year 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) |
— | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #289345 | Question closed | — | over 1 year ago |
| Edit | Post #289285 |
Post edited: |
— | over 1 year ago |
| Edit | Post #289285 | Initial revision | — | over 1 year 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) |
— | over 1 year ago |
| Edit | Post #289209 | Initial revision | — | over 1 year 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) |
— | over 1 year ago |
| Comment | Post #289186 |
Yes. That applies to both up and down votes. (more) |
— | over 1 year ago |
| Comment | Post #289204 |
Nicely thought out, well done. (more) |
— | over 1 year ago |