> > > More load _reduces_ the ripple? That's very unusual. > > Perhaps a parasitic oscillation that's defeated by more load > because now the loop gain is below 1?
But loading the +5V output also reduces the ripple on the +12V output. Loading the +5V output would, I think, vary the mark-space ratio of the drive to the main chopper and thus the drive signal to the 555 in the +12V regulator. Not that I can see how that would affect things. -tony
