A blog so big it needed two parts.
This time it's all about ceramic capacitors, and that mysterious thing of putting different value capacitors in parallel. Not to mention microphonics.
This time it's all about ceramic capacitors, and that mysterious thing of putting different value capacitors in parallel. Not to mention microphonics.
Vg278400 C.CE Tublr 220pf 50v and mylar on my Yamaha CD I have not heard of the first type of capacitor what type of a capacitor is C.CE Tublr please let me know
A Dave Jones video under 7 min, why do feel I just teleported to an alternate universe. Had my beer ready and all, kinda feel short changed.
I don't understand, amazing advances in technology and they just keep getting better, but the entire video is about shortcomings: they can be very sensitive to temperature, have shocking and atrocious changes in rating with temperature, are super sensitive to sound, can make your circuit noisy and are extremely brittle. So, what is this transition to them all about? Why would anyone want to transition to such a device? Are the ones they're transitioning from even worse??
We used to call them, "Wafer" caps!
waouh, youtube was hard before….
Did you write a book yet?
One of the most underrated channels I have seen
Hello I have a Sentey 750w Essential PSU in my pc gamer (i 7 / RTX2080)
and yesterday one of this x-caps exploded ( I opened the PSU and watch a 1 of 3 x-caps exploded 0.33uf 500v X2), but the
psu contiunued working ok, my pc start ok, next monday I will buy a new
PSU (and maybe repair that x-caps 0.33uf later)….. the questios is?
Can I continue playing with my pc for a few days? or will explode all my
pc? thanks
Hello I have a Sentey 750w Essential PSU in my pc gamer (i 7 / RTX2080)
and yesterday one of this x-caps exploded ( I opened the PSU and watch a 1 of 3 x-caps exploded 0.33uf 500v X2), but the
psu contiunued working ok, my pc start ok, next monday I will buy a new
PSU (and maybe repair that x-caps 0.33uf later)….. the questios is?
Can I continue playing with my pc for a few days? or will explode all my
pc? thanks
Great video; thanks man!!!
Hello, kindly do a video about feedthrough capacitors.
i was thinking "huh why dont we use ceramic caps in speaker crossovers?" and then you said microphonics. oh.
when due to microphonic effect a cap can have extra voltages, then wouldnt it be bad for the circuit? perhaps mV ranges for sensitive circuits?
What was the name of that effect that you said effects cable?
watching this in 2016 this guy is getting old !!
ceramic or film for 100KHz 100Vac? Part of a resonant circuit (high power LC oscillator as part of the drive a TV flyback transformer)
Time goes by so fast!!
Anyone know how I can pick the 'worst' microphonic caps.. that is, I'd like to find ones that are highly inclined to produce sound, or pick it up.
Thanks
A capacitor should be operated within ~65 – 75% of their rated maximum voltage & properly polarized.
To operate them at lower voltages, the dielectric is not placed under proper "stress" to have the capacitance they are manufactured for. Lower than that operating voltage, there is less capacitance than rated.
You pointed out very vividly that the plates of a capacitor will move. Particularly in multi-layer capacitors. They generate physical movement which can result in micro cracks in boards. Sometimes that movement is in the audio spectrum heard by the human ear, other times ultrasonic. But there is movement which can affect the capacitance value by changing the space of the dielectric which is controlled by the applied voltage.
Operating within the 60 – 75% range is very important for pulse forming, shaping, clampers, clippers, oscillators, or other pulse coupling, transferring or developing circuits. Grossly over maximum rated voltage component will never perform in these circuits as expected, even though the capacitance value is labeled to be a match. It does not have that capacitance value until operated within this "sweet spot" voltage range. Even for well regulated power supplies, the operating voltage should be within 60 – 75% of maximum rated voltage to stress the capacitor dielectric enough so the rated capacitance is there.
You should have mentioned the nasty residual dielectric polarization of ceramic caps. What happens is that at the range of milivolts, the apparent capacity increases a lot and the cap will keep voltage for a long time. This can freeze astable multivibrators and put a nasty offset voltage to smoothed measurement points. I always prescribe foil caps to such applications.
Studying electrical physics right now and these videos are excellent to give the equations some context. Thank you!