How A Dialectric Works and How Capacitive Proximity Sensors Work - Simply Put
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- เผยแพร่เมื่อ 1 ต.ค. 2024
- A capacitor is an insulator separating two conductors, and a dialectric is the name for this insulator. The electric field of attraction between the positive and negative charges on the plates of a capacitor reaches not just between the plates but also around them, like a magnetic field would, and so the dialectric is not just between the plates directly but also between and nearby. Different materials for the dialectric (such as air v. a hand) change the capacitance, and this can be detected.
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Damn in 40 years I could never understand the dialectric until now. No electricians, teachers, even engineers, have ever been able to explain it.
This video is clear as a bell, you are the man!! Thanks.
I love your spirit. Let's learn everything.
Trank you so much , you sir are amazing
Bro, that was a freaking amazing video. Finally someone explain to me how capacitive sensors REALLY works. Congrats!
most underrated video on capacitor on youtube
Sorry to say that there are a few mistakes in your video. 1) Just spelling, but it's dielectric with an e. 2) Then there are no protons involved in an electric circuit, it's just more or less electrons. 3) And you have to be cautious about drawing similarities between electric and magnetic field. You can have a single, electrically charged object and it will be the source of radial field lines. That is not possible in magnets. Only if you have a negatively charged object close to the positive one, the electric field lines will go in between the two.
Just found your channel subscribed and thumbs up I use copper strips to learn circuits I tape them down on a piece of cardboard and solder my components as needed good learning tool CHEERS
I’m also glad your hand doesn’t look like that and you don’t have to see a doctor. LOL. That absolutely cracked me up.
Explicit and comprehensible, good job.
Bottle capastor.....5 gallon bucket........yep.........use a can aluminum.........yep
That was an amazing explanation.
You look like Hagrid teaching us about capacitors 😊
Thanks this was very helpful
So I'm guessing this is the basis for capacitive touch screens?
lovely stuff
Bravo......beer.....and then pee.........plank cap........cheers
Amazing! Thanks.
OMG, Hagrid! This video is really AWESOME!! I'm researching on how calipers works, I can share few information if you are interested for further video (y). Just le me know.
Beautiful video. This explained capacity proximity sensors better than any other source i've found. I hope you go to heaven cause you truly are doing god's work.
Well done. Very exciting. Unfortunately I was distracted by the image of semi naked ladies at the beginning of the video. I hope you stop showing it.
So the waves are actually not just above the wire on the table, but the waves are also under the table as well, because the wire sits on top of the table.. and if you put your hand under the table, it will trigger the effect as well. This is some beginner type wireless/no/non touch/touchless/proximity type stuff, and you're probably one of the very few that actually go this far into this particular subject, very good watch, tnx a million.
Do you have any info about capacitive sensors, instrumentation amplifiers for detecting very low frequencies?
you have given me so many ideas to do with copper tape & tin foil/allu-foil.. the possibility's are endless.. & its so true that sometimes the most simplest thing is the most effective!!!
Hope you are ok.
👏👍
Awesome.
Lmaoo headphones with the sides cut out :)
Awesome video, thanks!
Just a truly awesome video. Thank you.
Just awesome, Thank you!
This video deserves more views, honestly!
On larger (2 to 4 ft diameter) tunable passive loop antennas for AM radio they recommend that you space the turns of the loop about 1/8th of an inch apart to avoid capacitance between the turns but on the small 9 inch diameter passive loop I bought the coil turns are close wound. I keep forgetting why the turns on the larger loops have to be spaced exactly without going back and reading it again. My memory sucks and I simply don`t quite understand electronics. Is it because a close wound larger coil would have too much capacitance to tune the top of the AM band (1700khz)? Why isn`t the smaller coil affected this way? The air variable tuning capacitor used with these loops is 365pf typically to cover a frequency range between 520 and 1700 khz. By the way (for the curious), these loops work inductively and couple magnetically with the internal ferrite antenna on the typical AM receiver and boost the signal.
id like to know this too.. didn't know about what you just described there but im intrigued now to know... "simply put" can you answer this for him/me??????
Unfortunately I have not studied antennas and electromagnetic-wave transmission/reception yet. I can say that 1/8" air gap in terms of a capacitor is gigantic, so it very well could be to reduce the capacitance to a low enough level that it won't affect it. Maybe it doesn't matter as much on the smaller one because the inductance is stronger and overpowers it? Inductance is partially determined by the diameter of the coil. I wish I could tell you, but I have a lot of study ahead of me before getting into stuff like broadcast signals.
@@simplyput2796 It`s pretty interesting. Normally getting a good AM signal past 50 or 60 miles during the day is nearly impossible but using the loop I can get a strong signal at 138 miles on one station and a readable signal at 168 miles on another. With a 300 foot insulated long wire antenna stretched out through the bushes and lower tree limbs and connected to a small grounded coil of magnet wire I can hear surrounding states during the day up to 350 miles away. This antenna is a lightning magnet though.
Excellent explanation
help? I'm driving the gate of a mosfet... problem is, the gate doesn't use enough power from the caps to eventually shut itself off. It's a PIR motion circuit that keeps a light on for X time when triggered. The mosfet drives a larger 12v load. Gate is logic 3.3V
Your question is unclear without a circuit diagram, so I don't know what "the caps" are. Google gives me a whole bunch of different designs. Are you saying that you're trying to get the mosfet to continually drain a capacitor that's supplying its gate? Because the entire point of mosfets is they don't do that. If you want a transistor to drain a cap like that, use a BJT.
@@simplyput2796 yep exactly. The mosfet is friendly. The charge in the caps is what times how long the gate stays active. I'm gonna hook a boost converter to the logic and run the gate at ~10v. The conversion should bleed the caps. (Just dunno how quickly)
If you just want to charge the capacitor to high to turn on and feed the gate, and have the capacitor go low to turn the gate off after a fixed duration, why not just use an RC network? In other words, just add a resistor from the positive end of the capacitor (attached to the gate) to circuit ground, so the capacitor discharges through it, and you can apply the charging voltage (when you turn it on) directly to the capacitor's positive end (and the gate) or through an additional small-value resistor, so it turns on quickly.
@@simplyput2796 I would, but I'm piggybacking onto something pre made. Best i can do is an led in parallel, but the output flickers some of the time. Just something for fun. I like to experiment on things.
What have I done? Lol!