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<SNIP>At the time I didn’t use pre-regulators, but all signal processing stages in the entire system had their own regulated galvanically isolated power supply. <SNIP>RegardsPaul
SNIPThe PR3PPRAP (PR3 pre and post regulator application) shows the ideal connection system for one sub circuit section load. Using two regulators in series (Pre and Post regulation) provides a double layer of mains power supply line interference rejection making the equipment less prone to performance variation when the mains power is dirty during high grid usage.One PR3PPRAP is used for each sub section of the equipment circuitry. Circuit sections requiring a negative voltage rail would use NR3PPRAP constructed using negative voltage regulators. The 0V connection from the post regulator to the load should be connected to the ground terminal of any local load decoupling used in the subsection to be powered. The post regulator +VE connection should go to the positive terminal of the local decoupling. This keeps the ground return currents of each section out of the main earth reference system on the board allowing a very clean earth reference for the whole system. This makes a big difference to the resolution of dynamic scale and micro detail presentation. Timbre and tempo are improved and there is a reduction in confusion in the soundstage particularly when the music gets busy. Music just sounds more like real people playing music.Setting up the power supply properly where the equipment to be powered has many subsections can be rather expensive and time consuming. Few will venture along this path. Steve is one of the few.RegardsPaul