Could someone with more EE skills explain the ferrite beads on capacitors?
My understanding:
- (ideal) capacitors block DC and likewise form a low pass filter, but inductance lets higher frequencies through.
- ferrite beads block very high (RF) frequencies, so it's a high frequency low pass filter.
So it's just blocking high, and low, frequencies but not a middle band? So it's a bandpass filter?
There must have been a very specific purpose for having them on every cap, since nobody else does it. And putting them _attached_ to each cap must be for one/both of two reasons:
- Package convenience instead of populating two slots on the board
- Extreme locality for minimum... I don't know the EE term... noise/interference between two coupled components.
Anyway, if I'm right/wrong, I'd love someone to give me some background information. Thanks!
--Chris