Changes

*Because the "+" pin of the red bridge rectifier is bonded to ground, the red supply's '''negative''' DC output is the rail that goes down to the −15 V regulator. This is normal for a stacked topology but can be confusing if you expect the rectifier "+" pin to be the rail output.

*Keeping the digital +5 V / +12 V supply on its own winding (blue) isolates digital switching noise from the ±15 V analog rails, which carry the precision references for the AD7543 DAC and the AD654 V/F converters.

===Active Components===