I thought maybe a case where you might want to use tantalum or film capacitors is if an MLCC could suffer from a microphonic effect in a part of your circuit which would be sensitive to that. You can also get many small package voltage regulators that either say they are fine with 100% MLCC filter caps, or they want an tantalum/electrolytic cap (I think so that they don't self-oscillate?). I would love to know the reasoning / design differences etc that cause this effect. I've been looking at building stuff to measure capacitance and some of its primary parasitic measurements - ESR and leakage. It's also interesting how defining the precise farad value of a capacitor could change depending if you wanted to measure it over an AC signal and at what frequency. Overall the practical measurement techniques you can use for measuring these values is also an interesting topic, I think. Whether using some sort of fancy bridge circuit with a precise AC signal to get phase angles and stuff (ugh complex math), or doing 'simple' tricks with constant current measurements, deciding what frequencies to measure at, up to needing to generate high voltages to find some bulk capacitors' true leakage value when used for those domains. edit: different capacitor types' lifetimes is also another topic, mostly that electrolytic tend to need to be replaced more often, but you can also find different types dying in different ways. Then there's safety cap selection and usage for power supplies
It depends on how you have the capacitor wired in the circuit. A capacitor is like a variable resistor whose resistance is inversely proportional to the frequency of the signal.
@@JTKhopefuls I Think the cap being in series and parrallel doesnot matter. Just remeber that In DC the capacitor stores energy. In AC it allows signal of certain frequency to pass through it. Inorder to understand this better you have to understand how AC waves are superposed onto eachother. Actually the noise is also a signal when introduced in our power supply. It gets mixed up with our signal and we get a resultant bad signal at our end. First you need frequency of the noise. Calculate Xc. For our AC desired siganl, Xc will be too big and it will appear as open circuit but for noise it will be short circuit as it will appear very small. To calculate Xc f= 1/2pi FC Hope for helps.
What else would you like to know?
How about how to pick out the correct MOSFETs for projects. Like examples of searching through DigiKey like this tutorial.
Or videos on more PCB theory. Like the questions you get in an interview!
Thank you sir. Nice design guides. Can you do a series on EV charger design. Like emi filter design guide, pfc, llc stages and more..
This channel is everything I need!
Thank you very much :)
Your channel is great! I’m going into electrical engineering this fall and this stuff is really helpful to learn before I go in!
Glad to hear it :)
I thought maybe a case where you might want to use tantalum or film capacitors is if an MLCC could suffer from a microphonic effect in a part of your circuit which would be sensitive to that. You can also get many small package voltage regulators that either say they are fine with 100% MLCC filter caps, or they want an tantalum/electrolytic cap (I think so that they don't self-oscillate?). I would love to know the reasoning / design differences etc that cause this effect.
I've been looking at building stuff to measure capacitance and some of its primary parasitic measurements - ESR and leakage. It's also interesting how defining the precise farad value of a capacitor could change depending if you wanted to measure it over an AC signal and at what frequency.
Overall the practical measurement techniques you can use for measuring these values is also an interesting topic, I think. Whether using some sort of fancy bridge circuit with a precise AC signal to get phase angles and stuff (ugh complex math), or doing 'simple' tricks with constant current measurements, deciding what frequencies to measure at, up to needing to generate high voltages to find some bulk capacitors' true leakage value when used for those domains.
edit: different capacitor types' lifetimes is also another topic, mostly that electrolytic tend to need to be replaced more often, but you can also find different types dying in different ways. Then there's safety cap selection and usage for power supplies
Just a question,By theory Caps filters out DC and allows AC,hows it that it blocks AC aswell as thats what considered as "high frequency noise"
It depends on how you have the capacitor wired in the circuit. A capacitor is like a variable resistor whose resistance is inversely proportional to the frequency of the signal.
@@RGBEngineering gotcha! In which configuration does it provide blockage to ac or dc in relation to parallel and series connection ??
@@JTKhopefuls I Think the cap being in series and parrallel doesnot matter. Just remeber that In DC the capacitor stores energy. In AC it allows signal of certain frequency to pass through it. Inorder to understand this better you have to understand how AC waves are superposed onto eachother. Actually the noise is also a signal when introduced in our power supply. It gets mixed up with our signal and we get a resultant bad signal at our end. First you need frequency of the noise. Calculate Xc. For our AC desired siganl, Xc will be too big and it will appear as open circuit but for noise it will be short circuit as it will appear very small.
To calculate Xc
f= 1/2pi FC
Hope for helps.
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