Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #287232 |
There are no mainline on stream calculators that get it right except 1 (mine). They all show daft maths that appears to have been copied from the originator to all the rest hence, why I did my own. In your answer, I'm not sure what R23 or R13 is meant to mean and ditto k. I appreciate the work but yo... (more) |
— | over 1 year ago |
| Comment | Post #287197 |
R1 + R3//(R2 + RL) = Rin in mathjax is \$R_1 + R_3 || (R_2 + R_L) = R_{IN}\$ = `\$R_1 + R_3 || (R_2 + R_L)= R_{IN}\$`. Thanks for trying Olin
(more) |
— | over 1 year ago |
| Comment | Post #287196 |
Yes, both are connected and both must see their respective impedances when they look into the taper-pad port (no tricks etc.). I'm probably going to post another unrelated question to give the site a boost. Maybe you should think about posting the odd question (that you can answer) given you are site... (more) |
— | over 1 year ago |
| Comment | Post #286988 |
It's basically homework with no attempt to solve (more) |
— | over 1 year ago |
| Comment | Post #282053 |
@#53586 welcome to the punishment planet (more) |
— | over 1 year ago |
| Comment | Post #286850 |
The fuse needs to be on the input supply side to the zeners and not the output to the sensors. (more) |
— | almost 2 years ago |
| Comment | Post #286823 |
I hadn't really thought about an actual device but the TLV looks a decent choice. (more) |
— | almost 2 years ago |
| Comment | Post #286823 |
I won't work using this type of chip with a massive impedance feeding the chip's Vcc pin. I've said enough on this subject now. Take heed or be prepared for disappointment. (more) |
— | almost 2 years ago |
| Comment | Post #286823 |
The absolute maximum voltage the supervisor chip can survive is 7 volts. Two series batteries can be 8.5 volts when close to fully charged. And, if that wasn't a problem enough, you would need to use a PMOS FET in the positive lead else you could carry on discharging the battery through the MOSFET bu... (more) |
— | almost 2 years ago |
| Comment | Post #286809 |
It draws 6 uA current and that will still deplete your battery. I'd be concerned about that but sure, in principle, that's the sort of comparator idea that fits in with my thinking. Check that it can handle supplies as high as 9 volts and, regards the resistor values, there should be enough informati... (more) |
— | almost 2 years ago |
| Comment | Post #286792 |
The op-amp (beyond its local feedback) needs to have a resistor in series with the output that feeds the first inductor L1 else, it's not a Hartley oscillator. Please learn how to draw schematics correctly. (more) |
— | almost 2 years ago |
| Comment | Post #286793 |
Actually, to make this circuit work correctly, you need theoretically an extra resistor to ensure that the pi-network behaves like a 3rd order filter and not a 2nd order filter. This means that the op-amp MUST have output resistance (despite the circuit showing none). I mean, what's the point of the ... (more) |
— | almost 2 years ago |
| Comment | Post #286745 |
Yes, you could make a converter using a BJT oscillator and a transformer connected to a rectifier and smoothing capacitor but, it would be low-powered, inefficient and have poor regulation so, why would you bother? (more) |
— | almost 2 years ago |
| Comment | Post #286738 |
A BJT doesn't have a CE junction; it has a BE and BC junction. The yellow line you drew is too simplistic as is the graph you drew it over. Each curve in that graph has a differently sloped saturation region like [this](https://it.mathworks.com/help/examples/sps_product/win64/ee_npn_02.png). This mea... (more) |
— | almost 2 years ago |
| Comment | Post #286724 |
R/L is actually \$4\pi\$. You have inadvertently chosen to work in radians/sec but you didn't convert Hz to rad/sec. Rookie error. Also, you didn't appear to understand that the basic relationship involved is this: \$Q=\dfrac{1}{R}\sqrt{\dfrac{1}{LC}}\$ and, Q is centre frequency divided by bandwidth... (more) |
— | almost 2 years ago |
| Comment | Post #286537 |
Your graph is for a PNP transistor yet you have drawn an NPN transistor (more) |
— | almost 2 years ago |
| Comment | Post #286435 |
You can tweak the MOSFET VGS threshold voltage with the addition of a VSB voltage. See [this](http://cmosedu.com/jbaker/courses/ee420L/s15/students/yurgelon/lab8/lab8.htm) (more) |
— | about 2 years ago |
| Comment | Post #286020 |
The maximum allowable level of the input voltage ripple is not calculated; it is something you, as an engineer decide upon. (more) |
— | about 2 years ago |
| Comment | Post #285928 |
Mike, I'm not demanding anything and I have no interest in the politics of the site. (more) |
— | about 2 years ago |
| Comment | Post #285921 |
It seems a rather lame discussion to some of those on SE. I mean, recently one guy kept having a go at me and we both got banned for 5 days. Another more recent SE discussion got me banned for a week despite the idiot totally trying to misrepresent what I said in his answer i.e. his answer was all ab... (more) |
— | over 2 years ago |
| Comment | Post #285921 |
@#53110 cheers Mike (mike?) (more) |
— | over 2 years ago |
| Comment | Post #285921 |
@#53042 I'm happy to take a look at the carnage of your endeavours that happened before I joined. I'm also happy to give you my opinion on what you wrote but, I can be brutally honest sometimes so, if you are up for it, leave a link. (more) |
— | over 2 years ago |
| Comment | Post #285861 |
No I haven't. Just because the transmission-line symbol looks like coax, it doesn't mean it has to be regarded as coax. (more) |
— | over 2 years ago |
| Comment | Post #285928 |
@#8062 no problemo (more) |
— | over 2 years ago |
| Comment | Post #285921 |
I really don't get the in jokes here. (more) |
— | over 2 years ago |
| Comment | Post #285820 |
I totally agree - simplicity is the key word here. Get rid of non useful red-tape (more) |
— | over 2 years ago |
| Comment | Post #285106 |
I didn't upvote the question (something I don't normally do in the other place) but, I did answer it and, I think it's fair game that if I answered it, that should be regarded as equivalent to an upvote. Hey, if you answered it just to reveal how some parts of the question were undecipherable or full... (more) |
— | over 2 years ago |
| Comment | Post #285921 |
Totally and thoroughly agree. (more) |
— | over 2 years ago |
| Comment | Post #285928 |
Ah, maybe so to you, but it's based on many years experience in a hard place like SE. (more) |
— | over 2 years ago |
| Comment | Post #285907 |
Downvotes are indicators to people seeking help on a particular subject that an answer may not contain useful information and should be ignored. Now, to me, that seems like a good reason to prevent ill-placed downvotes. It's the main reason why I downvoted your answer BTW. (more) |
— | over 2 years ago |
| Comment | Post #285921 |
@#53110 in downvoting this answer you are, in effect, telling the author of the answer that his answer is worth less than no answer at all. I certainly don't think this is the case. Look at it from the perspective of the guy answering; he put some effort in to produce words that maybe could be improv... (more) |
— | over 2 years ago |
| Comment | Post #285921 |
Reasonably competent (and even junior ranking) engineers will certainly understand the term mentioned. I don't understand why you think they won't. (more) |
— | over 2 years ago |
| Comment | Post #285737 |
@#53110 I choose to complain for sure and, if I'd known about a debate (I received a message just minutes ago from Olin), I'd have both complained and participated. I will of course participate now that I know there's a debate. (more) |
— | over 2 years ago |
| Comment | Post #285854 |
Well, @#36396 without the link (that you have just provided) I can only say I'm up for it. (more) |
— | over 2 years ago |
| Comment | Post #285854 |
@#36396 I'm up for it. I would also suggest that new users need to reach a certain reputation before they are allowed to downvote thus preventing moron abuse. I might also suggest that anyone downvoting (that can d/v) are given a small list of options to tick for their reasons. OK this last bit may b... (more) |
— | over 2 years ago |
| Comment | Post #285878 |
On this answer I'm still registering 7 downvotes: -
https://electrical.codidact.com/posts/285721/285737#answer-285737
Now maybe some of them are genuine but certainly not all. (more) |
— | over 2 years ago |
| Comment | Post #285876 |
Hurrah - spoken like a true champ (more) |
— | over 2 years ago |
| Comment | Post #285877 |
And I'm a volunteer too.
I'm not comparing the scale of this to a criminal offence - it's far less than that but, if a criminal offence "outs" the perpetrator then why shouldn't this lesser offence? (more) |
— | over 2 years ago |
| Comment | Post #285855 |
Then this site should prevent users who wish to remain anonymous from casting downvotes on anything. Personally I would choose not to be anonymous as I believe in openness in things like this. If you wish to avoid looking like big-brother stack exchange then you should consider this. (more) |
— | over 2 years ago |
| Comment | Post #285855 |
Just tell me the name of the downvoter and there's a chance I might be able to give you the reasons they downvoted. It's probably some revenge thing from stack exchange. (more) |
— | over 2 years ago |
| Comment | Post #285854 |
Thanks Olin. Time isn't an issue. (more) |
— | over 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) |
— | over 2 years ago |
| Comment | Post #285737 |
Thanks Olin. I also agree about transparency when it comes to downvotes. (more) |
— | over 2 years ago |
| Comment | Post #285737 |
Did you downvote my answer @lundin? (more) |
— | over 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 |
| Comment | Post #285361 |
You should ask a question. (more) |
— | over 2 years ago |