Hello all,
Plugged in a "new to me" 6450-24p, and the thing is hella loud. Ordered some
Comair Rotron "Gryphon" GDA4028-12BB fans and it's... still hella loud. Pulled the fans out and running them outside the case, it looks like the most annoying part of the noise is the vibrations and the PWM buzz.
I ran across this post (
https://forums.servethehome.com/ind...be-40gbe-switching.21107/page-187#post-269342) from earlier in this thred, where a guy used a 330µF to quiet it down. I ran the same test he did briefly, and it does indeed eliminate the PWM buzz.
I've spent the entirety of this evening trying to understand out how low-pass filters work, but I must be incredibly dense, because I'm still just as puzzled as when I started. Based on what I've read, it sounds like you need a resistor and a capacitor to make it work - yet it seems to work just fine with a capacitor by itself.
My question: Does a capacitor, when used in the manner described in that post, have a chance of damaging anything? And if so, and a resistor really should be used, how would one determine what resistor value to use? (and anyone know the PWM frequency on the 6450? I've got a pretty nice (Brymen) multimeter, but the DC frequency function is reading 0hz or 60hz depending when I measure it, and that guy's video show 3khz).
Thank you