Catalinbread · Overdrive

Formula 55

9V · 5 mA · maker

Catalinbread Formula 55 power requirements

9V DC · centre negative · draws 5mA
the voltage it ships for · also runs on a 9V battery · from the maker
“You can power your Formula No.55 with a 9v battery or any good quality filtered and regulated 9-18vDC power supply with a center-negative tipped plug designed for use with effects pedals. … 5mA power draw at 9vDC, 10mA power draw at 18vDC” source
Checked 2026-10-13
18V DC · centre negative · draws 10mA
from the maker
“regulated 9-18vDC power supply with a center-negative tipped plug designed for use with effects pedals. … 5mA power draw at 9vDC, 10mA power draw at 18vDC” source
Checked 2026-10-13

59.94 × 109.98 × 49.78 mm (2.36 × 4.33 × 1.96 in)

Width × depth × height, from the enclosure standard.

Each has an output that can power it, checked against its published figure. Plan the whole board to see what runs everything.