Regulators and local power bypasses in a cd-player

[Flemming J P]

I've recently replaced some local power bypasses Caps (original 2 X 100uf, new 2 X 1000uf) for each rail near the output stage (OPA2604). The difference was huge, maybe it's because there is only one +-15V rail which drives everything in the cd-player?

I have planed to make a new output stage where I will make a +- regulator based on LM317 and LM337 for each IC (OPA637 and BUF634) and was wondering if a local power bypass should be before or after the regulator? (I know that the regulator should be as close as possible to what it's feeding)

 

[vbd]

I would recommend bypass both before and after each regulator, a 100nF multilayer ceramic for HF very close to each IC power pin, as the ICs are wide bandwidth, plus a LF say 100uF or more...
Denis