OMF-1
Analog filter Rack
Power Supply
The OMF-1 is supplied with the appropriate wall-wart AC adapter. In case you need a
replacement, you can get the correct AC Adapter for the OMF-1 through Mode Machines
online store:
https://supr.com/mode-machines/category/products/power-supplies/
In case you want to source your own power supply, the recommended option is to use an
insulated wall-wart or AC adapter. These can be bought from most places and are used
external to the OMF housing. They are very safe since all the nasty dangerous stuff is kept
inside the wall-wart.
You need a 15V or 18V alternating current (AC) output at 250mA or higher rating. Do not
use a DC output type. Although the latter are the most common type of wall-wart for guitar
effects pedals, they will not work with the OMF. To reiterate, because this is really important,
it must say 15VAC or 18VAC on it somewhere.
In the UK they can be bought from Maplin Electronics. The one we recommend is their part
number N57AT. This is a variable supply which means it can supply a variety of different
voltages. The adjustment is on the underside of the unit. Simply set this to 15V with a small
blade screwdriver.
Some 12V AC output types may also work but this is only because some AC output wall-
warts tend to be poorly regulated and have a lot of overhead. Do be aware that if they do
work some of the time they may not work all of the time. If the voltage does fall below the
required operating voltage of the OMF-1 the most obvious sign is an audible hum from the
outputs. You will not damage the OMF-1 by doing this although any connected amplifier or
speaker system may object to the humming.
7
