Decoupling Capacitors 2/3 - Calculating a minimum value and testing the effects

[@carlosdiaz4535]

Can't get tired of your videos, I've been watching them the last couple of weeks and learned more than in school and work, you got a great mix of simulation, theory and hands-on in electronics. Kudos to you.

[@FesZElectronics]

I'm happy these are useful! Thank you!

[@m1geo]

I don't think I've ever seen a simulation and practical measurement agree so closely before! Nice work! 👌

[@remy-]

Ok. From ‘just add a 10n cap’ to easy understandable science by you. Thanx! 🙏🏻

[@homemade83]

keep going , you are different.

[@rul1175]

A treasure of a video. Subscribed and thumbs up.

[@RixtronixLAB]

Nice information, thank you for sharing it with us, keep it up :)

[@FF7824]

Very instructive and well presented. Thanks!

[@thearithmos3408]

Nice job, you really deserve more subs.

[@jaredgray7872]

Thanks for the video! I like how you go from theory and formulas to simulation to real life. I'm curious, have you used micro-cap before?

[@FesZElectronics]

Not really, but that program has been recommend to me before. Simulation results should be the same from any spice simulation program but at the moment I am most familiar with LTspice so I stick to that.

[@KamleshGadhvana]

thanks for this solution very nice work

[@q12x]

Nice explanation

[@profpoochie]

Thank for very nice tutorial.

[@FesZElectronics]

Glad it was helpful!

[@BalticLab]

Oscillations in a nutshell: When you don't want them, you get them. When you actually want them, you don't get them. 🙂

[@FesZElectronics]

This should be one of Murphy's laws :D

[@crazyham]

⚡🙏⚡ Awesome Channel Thank You ⚡🙏⚡

[@hernandariocostantini5420]

Excelent video.....

[@iblesbosuok]

Excellent

[@afonsomanuel1585]

Like. Excelente.

[@cannesahs]

Really good video.

[@louco2]

Are you considering the 360mv the voltage drop across the capacitor/ESR? Because in my mind it should be U_supply-V_drop (8.5v-0.36v)=voltage across capacitor/ESR.

[@mrlajel]

Hi Fesz, what do you mean about the inductor, is it a part of equivalent circuit? or is it added to the circuit as a part of decoupling mechanism? thank you.

[@FesZElectronics]

Both I guess; an inductor is part of the equivalent circuit of a capacitor, and this is detrimental to its filtering ability; but an inductor can also be added in series with the power line to form an LC filter with the capacitor. The inductor built into the capacitor cannot be changed, while the one added in the LC filter is up to the designer to chose a value.

[@chandrashekarg2073]

How to measure dv/dt of capacitor ?

[@maksymkloka5016]

I searched the internet far and wide ... can't seem to understand where the C=L(Zt^2) came from. Any chance you could assist.

[@FesZElectronics]

I don't remember exactly but I think its the damping factor equation where R is replaced with Z and the damping factor with 0.5; so to have a clear underdamped condition.

[@christopherwolford6522]

I don't have an o scope, looking at making one from stm32 or ATmega32u4, but I'm not sure how much of an o scope I need. What type of range would I need for small examples like this? Thanks. Edit: I would like to build small little led / other smps dc to dc converters from ground up and maybe take old psu for PC and build a cheap lab psu. I'm working on small stuff and working on setting up a home lab.

[@FesZElectronics]

I guess the biggest limitation in a uC based scope will be its bandwidth. What do you expect to get out of your circuit? I could not say what is an ideal BW for my examples, you can usually fine-tune the experiment to work at lower frequencies - this can be simulated in LTspice first.

[@christopherwolford6522]

@@FesZElectronics thank you, that's what I was thinking. Currently I am wanting to dive in to smps and dc to dc buck and boost. With $10 stm32 I can push 1.5 to 2MHz, with the ATmega good to about 50KHz. Note this are dso. I would love a nice one, but time and money don't justify. Last I used an o scope was 3 years ago in an intro circuit class. Thanks for the response.

[@mojtabajamal3457]

hi ...you are very perfational.

[@paulwary]

Think you mean 'professional'? I agree!

[@debmalya6144]

So just adding more capacitors are not always good idea

[@aa-bu7ml]