This is why I love this channel. You actually burn things to show what happens when things go wrong. Usually you only learn the right way, but never get to see the wrong way. Awesome video.
The cap at the end of the video behaved exactly as it was intended to. The pressure in the cap caused splitting of the top of the can along the indents there specifically for that reason. However, even with those indents or in big cans that have a pressure relief safety plug, explosions do happen. They can be very dangerous and cause severe injury. You can wind up with the can where your eyeball used to be or being sprayed with boiling electrolyte.
I actually have a anecdotal story about capacitors. When I took physics class in college many years ago, we had some section about electronics and capacitors was one of the chapters, and a guy I knew back then had found a 1 farad--yes, a whole farad--capacitor. It came from some old IBM mainframe powersupply. This brilliant guy shorted this gigantic capacitor using a regular nail and the spark burnt of a chunk of metal from the ports. Crazy guy. He liked explosives as well. Don't know what happened to him though.
Hello Richard, you always have en enlightening video. Your quizzes are always fun. The one thing I would like to mention is that the capacitor discharged through the resistor and the internal resistance of the LED, which is about 20 ohms. Keep up the great videos!!
Thanks for another great video Richard. I've been reading/watching a lot about capacitors recently to try and understand an astable multivibrator circuit utilizing 2xNPN BJTs. As I understand it, the property of 'displacement current' of a capacitor in crucial to this circuit's operation. What I don't fully understand is under exactly what conditions does displacement current occur? Obviously a 'rapid change' in potential on one plate, but just how rapid? It would be great if you could cover this property of capacitors in one of your future videos as I understand many circuits make use of this property and I'm sure that would be useful for many of us to understand. Thanks again for your great content!
Really good, well presented stuff. It would be nice to get an idea at the beginning not only how the basic components work, but also what typical uses they're put to. e.g. for capacitors, smoothing, noise filtering, etc. Even if the details will come in a later video it would be great to know why they're found in almost every circuit.
Heya, very nice video and so easy to untherstand with the explanations and practical demostation and for me yes I would like to see the formule with some calculations because at school I didn't got that to learn
A couple of things you missed.... bi-polar electrolytic capacitors (commonly used in audio circuits) and putting a polarized electrolytic capacitor in backwards. The latter will of course cause the cap to instantly explode. Same for tantalum caps too. Maybe you can do that as a grand finale in the next part hehe!
I avoid using Swiss Rolls or Christmas Logs in power supply sections; they tend to leak at higher temperatures making the boards tacky and inviting ants.
True. I think Christmas Logs also have the higher capacitance per layer, mostly due to the high chocolate content 😜Well it works for me anyway, if i can beat the ants to it
Since non polarized capacitors work in both directions do you get the same results with the resistor in series with a capacitor when ac voltage is applied? What about ac voltage across a capacitor and led in series? Since the led only works in one direction does it still light but at a 50% duty cycle because of the ac only being in the right direction 1/2 of the time? Do these resistor capacitor circuits start developing tank circuit properties when using ac across them? What about with the capacitor and led circuit with ac; does this start to function as a basic crystal radio with a diode?
A resistor in series with a capacitor (resistor between input and cap; output across the capacitor) forms a "low pass filter." It takes quite a lot to explain how they work, so I suggest you look around the web. I had a quick look and found some articles that aren't too heavily into the math. An LED will behave as a rectifier, so if you put one in series with a capacitor and apply AC the LED will light briefly until the capacitor is charged to the peak voltage of the applied AC minus the forward voltage of the LED. There is no mechanism to discharge the cap, so this is a "one time" event. The reverse breakdown voltage of LEDs is quite low, so this only works for low magnitude AC input. Without a resistor in the circuit the initial charge current could be high enough to destroy the LED. If the RC time constant were very long with respect to the period of the applied AC it could take many cycles to charge the cap. You need two reactive components, normally a capacitor and an inductor, to form a resonant circuit ("tank"). Energy is transferred back and forth between the two reactive components. A simple RC circuit does not resonate. The forward voltage of an LED is high enough that it isn't a good detector for a crystal radio. You would need a very large signal from the antenna and resonant circuit to get enough voltage for it to work well. A germanium diode is usually what is used in a crystal radio.
Oh it was the one where we were finding out how long a capacitor would survive, when connected to a high voltage supply via a mosfet with a floating gate.... kinda like you do LOL 😂 ruclips.net/video/cpFRp9C10ww/видео.html
Question, why do you make the circuit parallel? I see this a lot and can't understand that. Thanks in advance. Be blessed in Jesus Christ name amen. Great lesson
I really think it would be worth your while to setup a Udemy course. Start with basics, then move into more and more troubleshooting etc. You already have most of the videos you'd need and you can always choose to keep updating the course
not really. you've forgotten he's running a business repairing stuff. sure he has a bit of free time but his business and making money to pay bills and buy food is priority. just watch the vids and be happy.
This is why I love this channel. You actually burn things to show what happens when things go wrong. Usually you only learn the right way, but never get to see the wrong way. Awesome video.
Thank you for how detailed you are with your videos and how you simplify the concepts I’m learning so much from you !
Entertaining, informative and fun. Look forward to the next one.
Wonderful explanations in this capacitors series. Looking forward to its continuation.
Coming soon 😉
The cap at the end of the video behaved exactly as it was intended to. The pressure in the cap caused splitting of the top of the can along the indents there specifically for that reason. However, even with those indents or in big cans that have a pressure relief safety plug, explosions do happen. They can be very dangerous and cause severe injury. You can wind up with the can where your eyeball used to be or being sprayed with boiling electrolyte.
Thanks. Is very good see your class!
You do a great job of explaining the basic concepts of all these components. Thank you very much for your content.
Love it. Great video
I did not know about Bounce Back. Clearly I need to pay more attention. Thanks for this video 😀
Another great and informative video. Thanks for putting in the time. Cheers
I actually have a anecdotal story about capacitors. When I took physics class in college many years ago, we had some section about electronics and capacitors was one of the chapters, and a guy I knew back then had found a 1 farad--yes, a whole farad--capacitor. It came from some old IBM mainframe powersupply. This brilliant guy shorted this gigantic capacitor using a regular nail and the spark burnt of a chunk of metal from the ports. Crazy guy. He liked explosives as well. Don't know what happened to him though.
Hello Richard, you always have en enlightening video. Your quizzes are always fun. The one thing I would like to mention is that the
capacitor discharged through the resistor and the internal resistance of the LED, which is about 20 ohms. Keep up the great videos!!
great job, from Italy!
Thanks for another great video Richard. I've been reading/watching a lot about capacitors recently to try and understand an astable multivibrator circuit utilizing 2xNPN BJTs. As I understand it, the property of 'displacement current' of a capacitor in crucial to this circuit's operation. What I don't fully understand is under exactly what conditions does displacement current occur? Obviously a 'rapid change' in potential on one plate, but just how rapid? It would be great if you could cover this property of capacitors in one of your future videos as I understand many circuits make use of this property and I'm sure that would be useful for many of us to understand. Thanks again for your great content!
Really good, well presented stuff. It would be nice to get an idea at the beginning not only how the basic components work, but also what typical uses they're put to. e.g. for capacitors, smoothing, noise filtering, etc. Even if the details will come in a later video it would be great to know why they're found in almost every circuit.
Love the magic smoke!
Heya, very nice video and so easy to untherstand with the explanations and practical demostation and for me yes I would like to see the formule with some calculations because at school I didn't got that to learn
Great. It would be nice to see the voltage charge and discharge curve on a scope or even the graphing multimeter you had on the last live stream.
Oh there is another part coming, showing a few other properties on a scope
Thanks
you're the best
excellent thank you
A couple of things you missed.... bi-polar electrolytic capacitors (commonly used in audio circuits) and putting a polarized electrolytic capacitor in backwards. The latter will of course cause the cap to instantly explode. Same for tantalum caps too. Maybe you can do that as a grand finale in the next part hehe!
I avoid using Swiss Rolls or Christmas Logs in power supply sections; they tend to leak at higher temperatures making the boards tacky and inviting ants.
True. I think Christmas Logs also have the higher capacitance per layer, mostly due to the high chocolate content 😜Well
it works for me anyway, if i can beat the ants to it
@@LearnElectronicsRepair loool
I always wondered why capacitors on circuit boards were unipolar and now I know!
“I’m not sure how conductive cake is!”… that’ll have to go down on the notes sheet 😂
Since non polarized capacitors work in both directions do you get the same results with the resistor in series with a capacitor when ac voltage is applied?
What about ac voltage across a capacitor and led in series? Since the led only works in one direction does it still light but at a 50% duty cycle because of the ac only being in the right direction 1/2 of the time?
Do these resistor capacitor circuits start developing tank circuit properties when using ac across them?
What about with the capacitor and led circuit with ac; does this start to function as a basic crystal radio with a diode?
Hmm lets try this....
A resistor in series with a capacitor (resistor between input and cap; output across the capacitor) forms a "low pass filter." It takes quite a lot to explain how they work, so I suggest you look around the web. I had a quick look and found some articles that aren't too heavily into the math.
An LED will behave as a rectifier, so if you put one in series with a capacitor and apply AC the LED will light briefly until the capacitor is charged to the peak voltage of the applied AC minus the forward voltage of the LED. There is no mechanism to discharge the cap, so this is a "one time" event. The reverse breakdown voltage of LEDs is quite low, so this only works for low magnitude AC input. Without a resistor in the circuit the initial charge current could be high enough to destroy the LED. If the RC time constant were very long with respect to the period of the applied AC it could take many cycles to charge the cap.
You need two reactive components, normally a capacitor and an inductor, to form a resonant circuit ("tank"). Energy is transferred back and forth between the two reactive components. A simple RC circuit does not resonate.
The forward voltage of an LED is high enough that it isn't a good detector for a crystal radio. You would need a very large signal from the antenna and resonant circuit to get enough voltage for it to work well. A germanium diode is usually what is used in a crystal radio.
I think most would prefer to use Scientific notation would help explain ratings better when using lots of zeros.
I think a lot of people don't understand scientific notation so it's swings and roundabouts
A capacitor is a lot like a cannoli, except instead of ricotta it’s filled with sweet, sweet dielectric 😋
Mmmmm dielectric 🤤
@9:40 which stream was the hole burnt? I subscribed BTW. 😊
Oh it was the one where we were finding out how long a capacitor would survive, when connected to a high voltage supply via a mosfet with a floating gate.... kinda like you do LOL 😂
ruclips.net/video/cpFRp9C10ww/видео.html
Absolutely thought “hmmmm I wonder how conductive a Swiss roll is” hahaha
Question, why do you make the circuit parallel? I see this a lot and can't understand that. Thanks in advance. Be blessed in Jesus Christ name amen. Great lesson
I did a a Google search for the conductivity of raspberry jam and got no relevant results, except for a number of recipies for making it.
I was waiting for it to go pop and see the Mrs jump
Another snack for thought, capacitors will not measure complete discharge as your meter will charge it a bit.
Yeah that is true
fab
I really think it would be worth your while to setup a Udemy course. Start with basics, then move into more and more troubleshooting etc. You already have most of the videos you'd need and you can always choose to keep updating the course
not really. you've forgotten he's running a business repairing stuff. sure he has a bit of free time but his business and making money to pay bills and buy food is priority. just watch the vids and be happy.
@@g4z-kb7ct I'm saying to use the vids he has already, not make fresh and I'm very happy
Some idiot i worked with would charge capacitors then put them into drinks cans in the canteen. Dont do this.
WOW when you turn the pwer off the LED goes out 😂😂😂 there be something really wrong if it stayed on!!🤣🤣
37:50 It didn't explode😱😱😭😭🤣🤣🤣
This is live video recording... expect the unexpected