Erica Synths DIY Polivoks(ish) ADSR EG kit - Manual (Page 10)

BUILDING INSTRUCTIONS
step➐a
You may have trouble with finding 79L10 – 10V negative voltage regula-
tor. Luckily we have a solution! Take 79L09, cut its GND pin off close to
the case and replace it with 680ohm resistor! Then solder the IC on PCB
as shown on picture below!
step➐
Solder trimpots and voltage regulator ICs