Resonate or not resonate here is the question...
For some people that like to try things like I do, here is a simply test that anyone can try with simple test tools...
Some basics:
A cap should be a shunt to all frequencies right? That would be great, but reality is far worse... As the internal inductance of the electrolytic cap rises it's efficiency on the higher frequency starts degrading and the impedance starts rising...normally to resolve this problem, it's used the bypass technique to continue when the big cap starts loosing efficiency and keep the impedance low...but the problem is that any technique isn’t 100% effective...as the small cap and the big cap will start resonating the impedance will start rising at the resonating frequency...If this resonance exists this test will measure it...
To the test...
"A cap should be a shunt to all frequencies right?" so what we do is to a signal generator feeding a cap in series through a 1kohm resistor (to prevent overloading the signal generator as it will be driving a shunt) and connect an oscilloscope in parallel with the cap so that we can measure the residual of the cap.
Change the frequency of the signal generator and see what’s happening on the scope...
The cap (or association of caps) that will show the lowest residual in the highest bandwidth is the best cap!
In my tests the single cap won but don’t believe in my word or anyone else, do this test and believe in you...
So Easy, So true!! Like the null test 😀😀😀😀😀
