EEVblog #33 2of2 - Capacitor Tutorial (Ceramics and impedance)

[lesterliston27]

all I can say is WOW!!!!!!!!

[CoolDudeClem]

I have not heard of microphonics in capacitors before, but I have experienced it with cables. Quite a few times when handling a cable connected to a piece of audio equipment, I could hear the sound of the cable being moved comming out though the speakers, as if there was a microphone connected to it whitch of course there wasn't!

[EEVblog]

@CoolDudeClem Yes, in cables it's called the Triboelectric effect.

[DeCypher91]

These videos are fantastic. I'm studying up on electronics for my audio engineering college course coming up and these are a huge help!

Thanks!

[TheThievingBeggars]

I like this guy! Good video, very informative! Thanks for this!

[chucktheduck]

Great Help, I needed to use a 555 timer at 50 hz, I looks ok!

[azdinator]

This guy is great. He's passionate and loves his job. We need some guys like him in France.

[Iseekoutthetruth]

what do you know about Nikola Tesla electric car the arrow, they say it had 1 car battery that could be driven on everyday and that he used a super capacitor and had a 6 foot antenna that stuck up in the air in the back of his car. could the antenna have been a micro phonic capacitor?

[ksjoberg]

Y5V tolerance isn't -82%, it's +82%! Though it's still -20%ish...

[lucasmontec]

Well, after all this... what is the best capacitor?

[LauxHawk]

@lucasmontec Depends on the application.

[EEVblog]

@rellimxelabolly A capacitor has small amounts of inductance and resistance in it also, hence the shape of the curve.

[Thetruthishere11]

Electrolytic caps suck. Tv's don't last long. Most of our electronics wont last.

[DagGirl]

3:00 OMG AWESOME :D

[Gameboygenius]

Microphonics? Don't tell the audiophools, mate. ;)

[ArtemRomanov]

Could you orginize your videos in playlist, please :)

[planexzeropoint]

like the bit at the end with the wave form as well, be cool if you could set up a phi gap ratio, the mind truly boggles.

[planexzeropoint]

hey dave, what's your thoughts on using barium titanate instead of ceramics?

[rottenapple02]

I have no training in electronics and this whole video was over my head but I have a question about the microphonic effect. Does this mean that if an electronic device is exposed to vibration regularly (i.e. my cell phone on the dash in my truck), it will put some unexpected stress on the circuitry and shorten the life of the device?

[EEVblog]

It can, yes.

Although products like that are usually vibration tested at the design stage. They have to meet certain minimum requirements in order to be transported by road and air to the end user without being damaged for starters. There are industry standards for this.

[rottenapple02]

hm. Interesting. Thanks.

[davidbball13]

AHHHH i friggin love your videos

[Afrotechmods]

5 stars for teaching me about the microphonic effect! I am guessing this effect is more of a problem with very low capacitance values like a few pF?

[Vlakpage]

Class 2 can have large capacitance changes not just over temperature but even over different voltages across the cap so watch out, it gets worse with larger values.

At work we have some boards with 10n and 22n NP0 caps but such large values are expensive.

[Twistx77]

Thanks again Dave, always great stuff!

[shiftplusone80]

Wow, thank you for the tutorial. I love how you can take something simple and make it complicated.

[Olwe90]

Keep it up mate. Even though I'm doing 2nd year mechanical engineering and taking digital circuitry, always learn new things from your video blogs.

[chromebeats]

that wasn't 10 minutes lol

also if you change your account to director you can upload videos longer then 10 minutes

[LainInnocenti]

thank you, keep it up please.

[ntjbjhq]

Love it, more info like this on components, any and all!

[TheCynicalAtheist]

Ditto.