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

#75 #electronics #capacitors
In this video I look at what is the influence of the value of the decoupling capacitor. In particular, how should you chose an appropriate value, that is as small as possible without compromising circuit functionality. I of course look at the basics in the LTspice circuit simulator and then try things out on a real life circuit.

More on decoupling capacitors:

Special Thanks to all my supporters on Patreon! Especially @afiskon !

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[carlosdiaz]

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.

[mgeo]

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! 🙏🏻

[FF]

Very instructive and well presented. Thanks!

[RixtronixLAB]

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

[rul]

A treasure of a video. Subscribed and thumbs up.

[jaredgray]

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?

[BalticLab]

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

[KamleshGadhvana]

thanks for this solution very nice work

[thearithmos]

Nice job, you really deserve more subs.

[louco]

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.

[christopherwolford]

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.

[maksymkloka]

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.

[debmalya]

So just adding more capacitors are not always good idea