u are thinking about a filter board for pc-amn/galga..serie's board's
basicly the video need it to nock down the noise..about that simple
for the power-supply part same thing..they just knock down the noise
before u ask a ton of q's about it
the output level's needed to be nokced down so
a choke and filter cap on the video line's
and a choke and electorlitic on the power line's >by-pass<
about that easy..no need to go tech here
ed