VR104 is a 5 kOhm pot in the output voltage feedback circuit and VR102 (500 Ohm) ... The build started with one of the common DPH5005 bench power supply kits, which [Dennis] ...

Power Supply . Just south of these are devices labeled Q5 and Q6 which I am assuming are part of a power supply selection circuit. ... your own AIY Kit. The KiCAD schematic files are available ...