Re: Question about Oxley RFI suppression filters FLTM/P/5000

On 1/31/25 15:40, Jean-Pierre Coulon wrote:

On Thu, 30 Jan 2025, john larkin wrote:
 

EMI filters only filter high frequency stuff, AM band and up. If your
problem is AC-line frequency ripple or low frequency switcher noise, a
typical EMI filter won'[t help.
>
What does the contamination look/sound like?

 At 10 MHz the ripple of my power supplies contaminates my output signal at a level much higher than the documented inserson loss.
 So I suspect some 10 MHz makes its way through a magnetic field and perhaps a filter with only a simple annular capacitor would be  more effective.
 

It looks like your circuit has gain from power-in to output. That's
bad.
Anyway, it's poor practice to expect a feedthrough filter to clean
switcher noise off your power lines.
Jeroen Belleman