Hi Alan,
from the days of repairing TV's I remember the permanent magnets on certain
"coils" too. Guess they used this to distort the current waveform in a
controlled fashion for the deflection unit.
About the DC-bias winding: Sounds a bit like a "transductor" - ancient magnetic
component, sometimes called magnetic amplifier. The basic idea was to control a strong AC
current with a weak DC current. But I cannot imagine these are used in SMPSU's.
About the slots in ferrite rods: Yes, they are used to reduce eddy currents.
Especially in those high-permeability types which are more semiconductors than
insulators (you can tell with an ohmmeter). I have a large bundle of them in my
radio-direction finding antenna for VLF ;-)
Regards, and have a good LF season,
Wolf DL4YHF
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