Retrobrad Presents! Electronics Tutorial 5 - Introduction to Capacitors.

[xRoNiN116]

thank you so much ,, you helped me a lot !

[jed30007]

you teach better than my professor.

[ion010101]

the time constant is a deep subject... you just lost me utterly at mention of it.

[ion010101]

Hang on. I thought holes were just atoms that were minus an electron (a place where an electron used to be). There are such things on the plate of capacitors? I thought there was merely an imbalance, fewer electrons here than there... Apparently there is more for me to learn. Many thanks. Brilliant tutorials.

[ion010101]

At last, a tutorial on yt that isn't completely worthless. You actually explain what's happening, and then give something to do based on that (one can set it up on a bread board).

[2Champions]

Brilliant tutorials, thank you so much Brad!

[adrsya]

Been enjoying your tutorials immensely (great for absolut beginners in electrics--like me!). Hope to see more in the future. :)

[Andre8869]

hey, nice video. Im building a power suply circuit with a capacitor in it which will feed a microcomputer. The battery which will power the computer is rated at 11.1 v. As I understand, more capacitance = greater charging/discharging time. so if I use a 1000 microfarad 16v capacitor in the circuit assuming low resistance(100ohms) 1 time constant should be 0.1 seconds. If I want a longer charging/discharging time therefore I would simply use a higher rated capacitor(3000 micro farads)?

[montauk06]

GREAT VIDEO!!!

[Joelpyro]

Very helpful video... THANKS!

[jobinjohn1992]

hey i dont understand the graph, where he says the current decreases. i thought the current would run through the circuit as its a complete circuit? also at 15.30 when u say the capacitor will get full 10 volts will the battery have 0 volts?

[spinlizard1]

Thanks for uploading this. Your vid taught me more in 10 mins about capacitors, and far more clearly, than the book that I've been struggling with for the last 3 days.

[ZoneXXL]

@Runelol mostly filters and timing applications.

[miguelvelarde10]

WHERE DID YOU GET THE 5??? IN 5X10ms =50ms

[Runeylol]

I don't get how these would be used in practical situations. Could someone please tell me?

[MrJohnpaul08]

good vid. . tHanks

[lolopli1]

Hey at 13:46 when you said ov across the capacitor, how can you get the 10v on the resistor if the pos voltage is not going across the capacitor yet? Oh how the works?

[zeproo]

This guy is a 5star teacher ! Thanks.

[weward]

what do you call a notebook like that with no lines?

[Nadrealis]

Can you use a capacitor as a reservoir supply for a transistor. For example, in the first closed circuit the capacitor would charge up to 10 V, if you then had a fuse or circuit breaker that opened the first circuit, it would allow the capacitor to discharge through the transistor turning it on and allowing an LED to turn on notifying the person that the circuit was broken and turning on a backup source. Now, I don't know how you'd keep the LED on, but is something like that possible?

[Nadrealis]

Can you use a capacitor as a reservoir supply for a transistor. For example, in the first closed circuit the capacitor would charge up to 10 V, if you then had a fuse or circuit breaker that opened the first circuit, it would allow the capacitor to discharge through the transistor turning it on and allowing an LED to turn on notifying the person that the circuit was broken. Now, I don't know how you'd keep the LED on, but is something like that possible?

[sixxdegree]

best explaination on capacitors on youtube i found... and ive seen most

[00retrobrad00]

@sixxdegree Thanks man, much appreciated!

[MrHorsetail]

Very good and helpful videos Brad, thanks. One question, Why is 5 time constants used to represent a fully charged cap, why not ten? Is 5 time constants used to represent a fully charged state in all caps?

[00retrobrad00]

@MrHorsetail To work out 1 time constant we just multiply the resistor by the capacitor. So if this worked out to be 1mS and we then connected it to a power supply - after 1mS it would be charged to approx 63% of that power supply voltage. if we waited 5mS we would find that the capacitor basically equals the power supply voltage (more than 99% anyway) So we use five time constants to say that it is charged because that is just how long it takes. This holds true for all capacitors..

[rome877]

Nice and clear good job !

[cymonsgames]

Am I correct that this can be used to make a simple circuit with a blinking LED? I'd like to see a practical application of the theory presented, even if it's just something tiny.

[00retrobrad00]

@cymonsgames I certainly will be making tutorials using capacitors in various circuits. although to make an LED actually blink, you are going to need more than just a capacitor. You can however charge the capacitor up, then connect it to an LED (through a resistor) and the LED will turn on and then fade to off. (as long as you had a reasonably large capacitor (hundreds or even thousands of microfarads)

[cymonsgames]

@00retrobrad00 Fair enought. I figured it was something like that.

All this theory tends to bar folks from doing anything with electronics, tho. There's so much between "learning electronics" and "doing electronics."

[MrBlandandboring]

These tutorials are brilliant.

[brokenbylaw2]

Thanks :)

[00retrobrad00]

Thanks for the feedback guys, it's very much appreciated!

[thomas3120]

Excellent Brad.  thanks again!

[davem314]

Thanks Brad!! I didn't really understand capacitors but now I do great!!

You should teach maths on YouTube (please) haha.

Keep up the great work man.