Electronics > Beginners
Do bypass caps invert the signal? 1010101 to 0101010
amyk:
--- Quote from: ataradov on August 11, 2018, 04:08:16 pm ---You don't have to be an expert on the subject, but learn how to ask question properly.
--- End quote ---
This, absolutely this. We're not psychic, we have no idea what you're thinking if you don't explicitly state it. You said you watched a video, so specify which one. The onus is on the asker to make him/herself not look like an idiot.
Beamin:
--- Quote from: mikerj on August 11, 2018, 05:37:17 pm ---
--- Quote from: Beamin on August 11, 2018, 04:03:26 pm ---I also realized that was a hero999 post before looking at the name: Just so you know those type of responses' scare away beginners because they are afraid to ask questions because someone make think they are dumb. Fortunately that doesn't work on me because I have no shame... or rather I don't value the opinion of hostile people, choosing to ignore them, and their insecurities that they try to project onto others.
--- End quote ---
It a cunning ploy to encourage people to make an effort at helping themselves before seeking help, and when they do seek help they are encouraged to ask questions in an intelligent way. You mentioned a video you watched, but don't provide a link to it, and then say you are talking about bypass caps when you meant coupling caps. This kind of thing makes it enormously difficult to understand exactly what you are asking since it makes no sense.
Even at this point I'm pretty sure no-one knows the thought process that made you think coupling caps can invert a signal. A single coupling cap is part of a single pole RC high pass filter, so the maximum phase shift would be close to 90 degrees, but in the frequency range that the coupling cap was chosen to pass, phase shift will be small.
--- End quote ---
I often don't know my terms so thanks for clarifying (A big reason why I sometime struggle with "googling" as bypass caps were not yielding results totally different thing.
So the coupling cap gets charged by the logic chip sending out one pulse of data. Since it goes into a cap in series that pulse is absorbed into the cap. That pulse doesn't get sent out until the logic chip puts a new potential on the cap which would have to be negative to get the charge out. How does it do that? If I think of a light switch turning on/off connected to a cap it's not going to work until I somehow get the cap to discharge by reversing polarity or something this is what I don't understand.
Nerull:
--- Quote from: Beamin on August 11, 2018, 04:27:14 pm ---
--- Quote from: ataradov on August 11, 2018, 04:08:16 pm ---
--- Quote from: Beamin on August 11, 2018, 04:03:26 pm ---Remember at some point EVERY ONE here had no idea of what an electron even was.
--- End quote ---
Hero999 never said anything bad about you or your knowledge, he just commented on a way you asked a question.
If you say you watched a video, then post a link to the video. There are a lot of videos out there, some are good, and some a bat shit crazy. Who knows what exactly did you watch.
You don't have to be an expert on the subject, but learn how to ask question properly.
--- End quote ---
I wasn't attacking him: I said I ignore those people. I replied with a friendly tip. If it makes you feel better I thought you were responding at first... Just kidding... And when I talk about videos on the electronics enthusiastvideoforum I am talking about the eevblog episodes, my other posts always include links. There is a chronic problem of people on technical forums responding this way, with this forum being an exception, hence it's popularity and beginner section. Honestly your avatar thing even says "I have informed you thusly" which can be seen as arrogant not as joking like I see it.
But that's all before this turns into a back and fourth.
--- End quote ---
I hope you understand that "I need help with something but I refuse to tell you what" is just as annoying as overly critical pendant posts.
hamster_nz:
I will explain a bit better later, but at high frequency an idea cap acts as a wire, and at a low frequency it is if it isn't there.
It is only in between these two regions where things get trick and you have to analyse things in detail bacause it is acting like a filter.
Nerull:
--- Quote from: Beamin on August 11, 2018, 07:57:40 pm ---
--- Quote from: mikerj on August 11, 2018, 05:37:17 pm ---
--- Quote from: Beamin on August 11, 2018, 04:03:26 pm ---I also realized that was a hero999 post before looking at the name: Just so you know those type of responses' scare away beginners because they are afraid to ask questions because someone make think they are dumb. Fortunately that doesn't work on me because I have no shame... or rather I don't value the opinion of hostile people, choosing to ignore them, and their insecurities that they try to project onto others.
--- End quote ---
It a cunning ploy to encourage people to make an effort at helping themselves before seeking help, and when they do seek help they are encouraged to ask questions in an intelligent way. You mentioned a video you watched, but don't provide a link to it, and then say you are talking about bypass caps when you meant coupling caps. This kind of thing makes it enormously difficult to understand exactly what you are asking since it makes no sense.
Even at this point I'm pretty sure no-one knows the thought process that made you think coupling caps can invert a signal. A single coupling cap is part of a single pole RC high pass filter, so the maximum phase shift would be close to 90 degrees, but in the frequency range that the coupling cap was chosen to pass, phase shift will be small.
--- End quote ---
I often don't know my terms so thanks for clarifying (A big reason why I sometime struggle with "googling" as bypass caps were not yielding results totally different thing.
So the coupling cap gets charged by the logic chip sending out one pulse of data. Since it goes into a cap in series that pulse is absorbed into the cap. That pulse doesn't get sent out until the logic chip puts a new potential on the cap which would have to be negative to get the charge out. How does it do that? If I think of a light switch turning on/off connected to a cap it's not going to work until I somehow get the cap to discharge by reversing polarity or something this is what I don't understand.
--- End quote ---
If the cap is properly sized, that's not what happens. Capacitors resist changes in voltage across them, so pulling one side of the capacitor up will result in the voltage at the other terminal going up as well, unless it is held low. The current flowing into one side of the capacitor will be equal to the current flowing out the other side. As long as the signal changes rapidly enough that it never fully charges the capacitor the signal passes through, with a phase shift.
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