I have a WS2812B[PDF] LED strip which I want to control with the PWM0 pin (GPIO18) of my Raspberry Pi.
Multiple sources highly recommend to insert a 330-470𝛀 resistor in between the data pin of the controller and the DIN of the first LED.
It looks something like this:
Apparently the resistor is there “for impedance matching between the [Raspberry Pi's] low-impedance output and the WS2812B's high-impedance input. When using long wires, they act like transmission lines, causing reflections, resulting in unwanted oscillations, ringing and noise.” quote This could damage the IC, cause flickering in the LED or something like that.
But I'm currently missing such a resistor, so my first thought was that maybe a ferrite bead could as well do the job. (Therefore the question.)
The LED strip without any resistor or ferrite bead looks fine to me and I also don't own an oscilloscope, so I cannot verify if a ferrite bead would work equally well.
I also lack the skills in electronics and electrical engineering to be confident enough that I'm not talking complete nonsense here. If somebody could help me out with that, I would appreciate it. Thank you very much in advance!