To make the 12, -12, & 5 volt power supplys easier to adjust I changed the adjustment pot to a 20 turn pot(Digi CT94EZ102-ND). I also changed the two 50K pots used to zero the HC and CO on the IR bench (R123 & R223) to 20 turn pots(Digi 490-2889-nd). I also made a schematic for the IR bench board.