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

Jean-Pierre Coulon <coulon@cacas.pam.oca.eu> wrote:

I have put some on an amplifier box for my + and 5 V supplies. But yet a
ripple on either supply signically contaminates my outut signal.
 
AFAIK they represent a 6-uH series inductor and an about 5-nF parallel
capacitor. Is this inductor a coil or a toroid? If it is a coil it could
radiate a signficant magnetic field, contaminating my input signal.
 
Regards

Sorry I don’t know the internal construction but suspect the inductor is
possibly not a coil but merely the central conductor passing through a
ferrite sleeve. In those feedthroughs the capacitors are often annular too
so nothing is left to chance.

You haven’t said what the frequency is of the ripple that you observe,
those devices will have negligible effect at powerline frequency.

--
piglet