Hi, I've just stumbled over this nice article + video from Cap supplier Murata.
Examples of Noise Countermeasures (Video) | Capacitors | Murata Manufacturing Co., Ltd.
It explains why we sometimes hear noise out of our notebooks during work. 😱
Effects happen when a monolytic ceramic smd cap is driven by a AC signal. This smd cap used nearly everywhere meanwhile can sing quiete nice. 😀
The ceramic cap is exited by the alternating fields inside and expands and compresses. The PCB acts as resonater. This finally makes the noise loud & detectable by our ears. It can be disturbing for the end user and therefore Murata advertises their own special cap design which really seems to compress the noise down to a minimum as you can see in the video.
For me the keypoint is another one: In any digital circuit wheter in Computer or pure CD drives it's expirienced that it's a benefit to mechanically couple them in a "right" way to the outer enviroment. By spikes or sand filled plates. Another point is to apply damping material on top of components etc...
This was sometimes seen as paradox as this is just a "digital" circuit" and not analog. 🙄
But ! I was told by computer audiophiles that micro vibration seems to alter capacity of for e.g. electrolytic components as the plates start to move. This introduces a small "swinging" signature to these capacities making the "C" smaller and bigger based on the vibration. I can confirm these tweaking potentials in digital areas through lots of tests I did.
Now I've learnt the following:
A) not only the typical "external" vibration exists and should be taken into consideration! If AC is passing a standard ceramic SMD cap the board may start creating its own noise. Hifi products are not known to "sing" loud as notebooks but higher numbers of ceramic caps could create a relevant influence to take notice from the design point of view. Maybe such noise can also be in a freq above our ears. Or the overall noise is lower than the ambient noise floor - not recognised by us but still an effect for the circuit an so finally detectable as sound detoriation after D/A conversion. Who knows...
B) And generally: The often under estimated correlation between electronic components to have mechanical side products as vibration (mechanical movement caused by fields) is definetly existing in "pratical world" and can grow to large scale like in the examples of notebooks.
Thougt that is interesting to report to you
Examples of Noise Countermeasures (Video) | Capacitors | Murata Manufacturing Co., Ltd.
It explains why we sometimes hear noise out of our notebooks during work. 😱
Effects happen when a monolytic ceramic smd cap is driven by a AC signal. This smd cap used nearly everywhere meanwhile can sing quiete nice. 😀
The ceramic cap is exited by the alternating fields inside and expands and compresses. The PCB acts as resonater. This finally makes the noise loud & detectable by our ears. It can be disturbing for the end user and therefore Murata advertises their own special cap design which really seems to compress the noise down to a minimum as you can see in the video.
For me the keypoint is another one: In any digital circuit wheter in Computer or pure CD drives it's expirienced that it's a benefit to mechanically couple them in a "right" way to the outer enviroment. By spikes or sand filled plates. Another point is to apply damping material on top of components etc...
This was sometimes seen as paradox as this is just a "digital" circuit" and not analog. 🙄
But ! I was told by computer audiophiles that micro vibration seems to alter capacity of for e.g. electrolytic components as the plates start to move. This introduces a small "swinging" signature to these capacities making the "C" smaller and bigger based on the vibration. I can confirm these tweaking potentials in digital areas through lots of tests I did.
Now I've learnt the following:
A) not only the typical "external" vibration exists and should be taken into consideration! If AC is passing a standard ceramic SMD cap the board may start creating its own noise. Hifi products are not known to "sing" loud as notebooks but higher numbers of ceramic caps could create a relevant influence to take notice from the design point of view. Maybe such noise can also be in a freq above our ears. Or the overall noise is lower than the ambient noise floor - not recognised by us but still an effect for the circuit an so finally detectable as sound detoriation after D/A conversion. Who knows...
B) And generally: The often under estimated correlation between electronic components to have mechanical side products as vibration (mechanical movement caused by fields) is definetly existing in "pratical world" and can grow to large scale like in the examples of notebooks.
Thougt that is interesting to report to you