Use of ferrite beads for PS filtering ?

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gurevise
Posts: 9
Joined: Fri Feb 25, 2011 1:13 am

Use of ferrite beads for PS filtering ?

Post by gurevise »

Guys,
I'm working on a power supply mod for my SS SUMO power amplifier (Ulysses 2).
I'd like to add a bit of filtering to quiet down rectifier diode switching noise.
Couple changes:
1. RC (10 Ohms and 0.1uF) across each rectifier diode.
2. Add LC filer in series w each power rail. Filter could consist of cylindrical ferrite bead and 1uF quality film or ceramic capacitor. Ferrite has about 10...50 ohms impedance above 500 kHz. This should clean up high frequency noise.
This should keep power supply very low impedance below 100k and clean up switching noise at higher frequencies.

BUT, I've read somewhere that ferrite's are not recommended for audio use. So, any comments or suggestions?

Thanks
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