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SONY CD AMP.
My SONY CD player had a noicy audio amplifier made of normal dual op-amps
So I found the best available single op-amps that was on the marked in 1993
The audio alias filter schematics is the same, but now all is DC-coubled and all powersupplys to each op-amps
has seperate decoupling capacitors and series resistors.
op-amps are mounted inside the PCB box, and all powersupply filters in another box, and regulators outside box..
This box is then mounted inside the Sony CD player
audio psu filter and mute relays
An extra transformator with 4 separate windings
The power supply +-12 volt is double regulated for each channel, so a total of 8 regulators is used