Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #285854 | Initial revision | — | about 2 years ago |
| Question | — |
Why am I receiving so many downvotes at once? Why am I getting these downvotes? It started last week (or the week before) and now it seems like it's getting contagious: - Screenshot of 9 downvotes on February 6, 2022 Seems like this site has some of the same outrageous inclinations as stack exchange. Downvotes should be registered and view... (more) |
— | about 2 years ago |
| Comment | Post #285814 |
@olin - keep them ready and warmed-up for the next bad post. In case anyone thinks Olin is being harsh, he's not. A little bite at a person's ankles to remind them what is expected of a good question isn't being unnecessarily rude; engineering requires absolute attention to detail if you are to be go... (more) |
— | about 2 years ago |
| Comment | Post #285737 |
Thanks Olin. I also agree about transparency when it comes to downvotes. (more) |
— | about 2 years ago |
| Edit | Post #285737 |
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— | about 2 years ago |
| Comment | Post #285737 |
Did you downvote my answer @lundin? (more) |
— | about 2 years ago |
| Edit | Post #285737 |
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— | about 2 years ago |
| Edit | Post #285737 |
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— | about 2 years ago |
| Edit | Post #285737 |
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— | about 2 years ago |
| Edit | Post #285737 | Initial revision | — | about 2 years ago |
| Answer | — |
A: How to protect RF switches from ESD? Currently there are $\boxed{\color{red}{\text{three}}}$ downvotes so maybe someone can explain why this has happened. Anyway, on to my downvoted answer: - You have "mentioned" the threat (the ESD level) but, you haven't defined the peak voltage or current limit for the potential victim. Neither ha... (more) |
— | about 2 years ago |
| Comment | Post #285693 |
Basically, if you look carefully and read between the lines of what Olin wrote, he is saying the following:
**look in the RFIC datasheet**. Can you remember my comment from under your question: *Don't you need to give details for the RFIC device since The RFIC manufacturer recommends to "add filteri... (more) |
— | over 2 years ago |
| Comment | Post #285687 |
Don't you need to give details for the RFIC device since *The RFIC manufacturer recommends to "add filtering caps" for high RF output cases.* (more) |
— | over 2 years ago |
| Comment | Post #285657 |
Not one even tiny little bit. (more) |
— | over 2 years ago |
| Comment | Post #285543 |
AGC (the variable gain amplifier) is best placed on the front-end before the mixer. However, the control voltage for it can come from after the demodulator or the IF stage. For FSK, it's likely that all you will have is a limiter-circuit that runs balls-out because, well, that's what FM requires i.e.... (more) |
— | over 2 years ago |
| Comment | Post #285543 |
The LNA appears to be the one that is adjusted and, that makes a lot of sense because that's where you'd want it to be to maximize noise performance i.e. you'd want the LNA to have variable gain to give the AGCed signal a better SNR. (more) |
— | over 2 years ago |
| Edit | Post #276438 |
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— | over 2 years ago |
| Edit | Post #276438 |
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— | over 2 years ago |
| Edit | Post #276438 |
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— | over 2 years ago |
| Comment | Post #285361 |
You should ask a question. (more) |
— | over 2 years ago |
| Edit | Post #285361 |
Post edited: Just breaking up the wall-of-text format into easier chunks. This post needs to ask a question. |
— | over 2 years ago |
| Suggested Edit | Post #285361 |
Suggested edit: Just breaking up the wall-of-text format into easier chunks. This post needs to ask a question. (more) |
helpful | over 2 years ago |
| Comment | Post #285242 |
Why does your diagram have time accumulating from right to left. This is very unconventional and I would be cautious about posting a picture that shows it like this. Maybe it came from a web site that's a little flaky?
You said this: `Assume now that the bandwidth of the signal is 2kHz.If the band... (more) |
— | over 2 years ago |
| Comment | Post #285198 |
A zener barrier in the so-called "safe area" will still require 3 zeners if it feeds equipment that is contained in a Zone 0 environment. Ditto if the zeners are mounted in a Zone 1 or 2 area (UK/EU regulations are what I'm referring to because I think NA regulations don't always recognize a zone 0 s... (more) |
— | over 2 years ago |
| Edit | Post #285173 |
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— | over 2 years ago |
| Comment | Post #285201 |
All zener barriers must have a fuse to protect the zeners. If you don't need much output current maybe 100 mA will do but, it has to be a fuse that is line/phase voltage rated (i.e. 250 volts) and, it has to have high rupture current (4,000 amps from a long ago and fading memory) (more) |
— | over 2 years ago |
| Comment | Post #285201 |
The fuse, in all zener barriers is never optional. The output resistors Olin shows suffice as current limiters. (more) |
— | over 2 years ago |
| Edit | Post #285173 |
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— | over 2 years ago |
| Edit | Post #285173 |
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— | over 2 years ago |
| Edit | Post #285201 |
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— | over 2 years ago |
| Edit | Post #285201 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Flyback transformer with Intrinsic Safety > Please let me know if there is anything wrong with this logic. So far so good. The voltage clamp (3 zener diodes for European IS category iA and two for category iB) is the limiter on voltage and, providing you do not generate more then these zeners, it's virtually a rubber stamp job. It's li... (more) |
— | over 2 years ago |
| Edit | Post #285173 |
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— | over 2 years ago |
| Edit | Post #285173 | Initial revision | — | over 2 years ago |
| Answer | — |
A: How long does it take for energy to propagate in a circuit? Try this out for size: - Image alt text Hope it's clear. Maybe a little simulation of 10 km 600 Ω line might help paint a better picture: - Image alt text The voltage (V1) that feeds the t-line via the 100 Ω lamp is a 1 volt step. The end of the t-line is shorted: - Image alt t... (more) |
— | over 2 years ago |
| Comment | Post #284955 |
Energy does propagate. If it didn't propagate then how would we ever hope to see the light of our sun. It propagates entirely on it's own and then, when that light (EM wave) hits something that can make use of it, then, that energy is partially or completely used or reflected. (more) |
— | over 2 years ago |
| Edit | Post #285138 | Initial revision | — | over 2 years ago |
| Answer | — |
A: 208VAC triple-phase to single-phase conversion > I want to convert the power from the wall from 208V triple-phase to 208V single-phase before feeding that single-phase into the transformer I got. Try this using a 1:1, 208 volts isolation transformer: - Image alt text Or get an isolation transformer that directly delivers 230 V AC on... (more) |
— | over 2 years ago |
| Comment | Post #285070 |
Why do you say convert triple phase to single phase when this is contradicted by only having two of the three hots available. Please fix this. It's a big deal. (more) |
— | over 2 years ago |
| Comment | Post #279876 |
Show your interface circuit up to the first line of chips. (more) |
— | over 2 years ago |
| Edit | Post #284863 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Resistance of digital ampmeter Image alt text You might get lucky and be able to measure the input resistance using this method. It should work because the black socket (common) is shared by all measurements. (more) |
— | over 2 years ago |
| Comment | Post #282671 |
When it is critically damped, there is not oscillation. (more) |
— | over 2 years ago |
| Comment | Post #284514 |
There is no input shown and no output shown and, with the component values you have shown, the BJT might just as well be removed entirely. (more) |
— | over 2 years ago |
| Comment | Post #284282 |
Let's **not** start with assuming *that torque vs. rpm of the load is linear.* (for extremely good and sensible reasons). Your follow-up question makes no sense either. (more) |
— | over 2 years ago |
| Edit | Post #284234 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Inductance vs frequency Inductance is defined by the shape of the coil, the area of the coil, the number of turns in the coil, the distance between turns, the ferromagnetic permeability of material within (and surrounding) the coil and induction to other not-so-obvious conducting parts. Frequency lowering (with a fixed A... (more) |
— | over 2 years ago |
| Comment | Post #284074 |
Do you mean C2? (more) |
— | over 2 years ago |
| Comment | Post #283960 |
Sorry but that's garbage. (more) |
— | over 2 years ago |
| Edit | Post #283993 |
Post edited: |
— | over 2 years ago |