BLACK NOISE GOMA Manual

00
Introduction
GOMA
Build instructions
01 Solder Zener diode
Bend de tabs and place the diode on the PCB.
Pay attention to the polarity, the black mark on
the diode must be aligned with the black mark
on the footprint printed on the silkscreen.
Double check the polarity and solder the diode.
01
02 Solder hearders
Start by soldering the I/O header. Then
solder the power connector. If you have
solder paste you can use some instead of
solder wire to make connector assembly
easier.
GOMA
Build instructions
GOMA stand for Generator, Offset, Mixer, Attenuverter.
The idea behind GOMA was to make an improved version of the classic 3
Attenuator/Attenuverter modules.
We wanted to design high-end but small module so it could fit in any case. We want it
to be ergonomic and easy to use despite is size. But we also wanted to pack as much
features as possible to make of it a "swiss knife module".
00
Contents of kit
1- GOMA PCB (SMD presoldered) x1
2- GOMA Faceplate x1
2- Pin header 2x5 x1
3- I/O Header x1
4- 11v Zener Diode x1
5- LED 3mm - Red/Green x3
6- LED 3mm - White x12
7- Jack socket 3.5 mono x6
8- Potentiometer B-100k x3
9- Small knob x3
10- Micro Switch x6
11- Micro Switch Caps x6
12- Power ribbon cable x1 optional
Sourced
BLACK NOISE warrants the contents of this kit to be free of defects in materials or workmanship and
to be conform with the specifications at the time of shipment for a period of two years from the date
of purchase.
We do not warrant, and we do not repair or take in modules to troubleshoot end-user DIY build faults
or second hand DIY products.
BLACK NOISE cannot be held responsible for any damage caused by one of our DIY kits and resulting
from an end-user DIY build faults.
If you encounter problems in the assembly you can contact us at: [e-mail]
Warranty

GOMA
Build instructions
03 Clean the PCB
Cut off the trimmer tabs of the diode and
clean flux residue with isopropyl alcohol.
02
04 Place the potentiometers
Place the potentiometers as shown in the
picture but not solder them yet.
GOMA
Build instructions
05 Place the dual LEDs
Place the LEDs as shown in the picture
but not solder them yet.
03
06 Place the white LEDs
The shortest leg of the LED is the cathode
(-). place the cathode in the square hole as
shown on the picture.
Place the LEDs as shown in the picture
but not solder them yet.
The shortest leg of the LED is the cathode
(-). place the cathode in the square hole as
shown on the picture.

GOMA
Build instructions
07 Place the jack connectors
Before placing the jacks make sure that
none of the legs of the sockets are bent
then place the them.
don't solder the yet.
04
08 Put Caps on switches
Place the caps on the switches as shown
in the picture.
GOMA
Build instructions
09 Identify the orientation of the switches
Look under the switch you will see a
round mark. Pay attention to this mark is
important to correctly place your switches
on the PCB.
05
10 Place the switches
Place the switches on the PCB. As
indicated in the previous step pay
attention to the orientation of the
switches. place the switches as shown in
the picture.

GOMA
Build instructions
11 Place the faceplate
Place the faceplate and screw the nuts on
the potentiometers and jack connectors.
06
12 Secure the switches
To prevent the switches from moving
during the assembly of the module, solder
a pin of each switch. Do not solder all the
pins of the switches right away. Make
sure the switches are flush against the
PCB before soldering them.
GOMA
Build instructions
13 Solder the jack connectors
Solder the jack connectors. Before
soldering them make sure they are flush
against the PCB.
07
14 Solder the white LEDs
Before soldering them make sure they are
flush against the faceplate and aligned
with the diffusers.

GOMA
Build instructions
15 Cut the tabs of the white LEDs
Once soldered, cut the white LED tabs. Be
careful when cutting the tabs, some are
close to SMD components, they could be
damaged during the operation.
08
16 Solder dual LEDs
As for the white LEDs, now solder the
dual LEDs. The LEDs must be flush with
the faceplate and aligned with the
diffusers.
GOMA
Build instructions
17 Cut the tabs of the dual LEDs
Once soldered, cut the dual LED tabs. Be
careful when cutting the tabs, some are
close to SMD components, they could be
damaged during the operation.
09
18 Solder the switches
Now solder the rest of the switch pins.

GOMA
Build instructions
19 Solder the potentiometers
Finish by soldering the potentiometers.
Once the potentiometers are soldered,
check the PCB to spot any solder bridges,
unsoldered pins, etc.
10
20 Check our module
Set your multimeter to "continuity",
connect one of the probe to one the the
ground pin. Test +12V and -12V pins with
the other probe.
your multimeter should not ring, if it rings
there is a short.
GOMA
Build instructions
21 Clean the PCB
Clean the PCB of flux and solder residue
using Isopropyl alcohol.
11
22 Place knobs
Place the potentiometers at 0, align the
white dot on the knob with the
potentiometer.
Press the knob halfway and turn the pot
to full to check that the knob is well
placed.
Once the knob is correctly placed, pushed
into the bottom.

GOMA
Build instructions
23 test your GOMA
12
For more information on connecting to
your rack and the possibilities of your
GOMA, consult the user manual
accessible by scanning the QR code.
Scan the QR code
to access the user
manual