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SONY CD AMP.
inside_top_all
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.
amp_close
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
opamp_details
opamps
audio psu filter and mute relays
An extra transformator with 4 separate windings
bottom_regulators
The power supply +-12 volt is double regulated for each channel, so a total of 8 regulators is used