Refactoring a "cost effective" linear power supply

[ovi_mv]

Hello

I started this topic because i believe it is possible and feasible to mod the "one huang lo" linear power  supply ( the ones with 2x fine+coarse adjustment pots & 2 panel meters, analog or 3½ digit ), which were sold in 10k  pcs.
To have a starting point i will add here the early version of the schematic (without the 7107 measurement board) used until 2006-2007. In few days time i will add up the "new" version of the schematic that  i believe it to be used  even on the relay&analog control of the Atten power supply described in episodes #439 and #440.