Erica Synths Eurorack bipolar 12V PSU kit - Manual (Page 6)

Install power transformer and solder its primary and sec-
ondary winding outputs in relevant holes of PCB! Make sure
you have correct primary winding voltage configuration of
the transformer. Congratulations, you have completed Erica
Synths 12V bipolar PSU!
TRIMMING
Connect precize voltmeter to the GND and +12V output and
adjust relevant trimpot in order to get exactly 12V reading
on the voltmeter. Repeat the same procedure with -12V.
CONSTRUCTION