I printed a board meant to supply a variable 5–250VDC from this open-source schematic:
This was my board
with this schematic (excuse my silly device symbols)
but I can't get the output voltage to vary. With the 5k potentiometer (the box at the bottom center of the board), it measured ~320V, invariant of the pot's setting. For a 10k pot, it measured the same voltage, again invariant.
Here's the soldered print (excuse the poor quality, someone else has them currently):
Is something shorting? Is it somehow "skipping" the potentiometer? Is there anything obviously incorrect or any likely errors I could test for?