DAC for technics SL-PS900

Hi everybody, I'm looking for a simple DAC schematic, if it's posible with an optical input

I'm planing to use it with an old Technics SL-PS900, and a cheap Sony DVD player

I never built something like this, this will be my first project. That's why I'm looking for something simple.

Can I use this DAC with my CD player?, and will it improve the sound with any of these DACs?

I need a complete schematic, cause I don't know much about DACs