CubuSynth Exhaust User manual

CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
Expander Module for the CubuSynth Engine
Build Guide
PCB V1.1 May 2022
Written and Illustrated by Ruben Sponar
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CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
Introduction
This Build Guide is written or buiders with experience in soldering and assembling PCBs.
Due to the complexity o the build, the guide is ocused on the steps that require special
care or techniques. There ore, not every component value is described and listed as a
single step.
To help keeping track o the already placed components, print the BOM and cross out
the parts you already soldered.
Tools Required
- Soldering iron (+wire)
- side-cutter
- Nut wrench / driver M6, M8
Helpful, but not necessary:
- Digital Multimeter
- Helping (third) hand / PCB holder
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CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
B ILD G IDE
STEP 1 (Main PCB)
Diodes
Identi y the 1N4148 diodes and put them in place. Orientation is Important! Make sure the line
on the diodes lines up with the stripe on the PCB silkscreen.
STEP 2 (Main PCB)
Resistors
There is di erent ways to go, you might already have developed your own method to place the
components and solder.
You can always select the resistors o the same value, place them, turn the board around and
solder in place. Trim the solder legs and move on to the next value.
Another method is to place all resistors and solder them rom the top, without turning around
the board.
On the next page, you can ind a picture o all resistors in place.
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2 1N4148 D8,D9
1 1k R135,R176,R221,R232
1 4k7 R138,R235
6 10k R137,R141,R143,R144,R153,R229,R230
2 20k R167,R231
7 100k
1 470k R136
R147,R154,R155,R177,R217,R218,R219,R220,
R222,R223,R224,R225,R226,R233

CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
STEP 3 (Main PCB)
ceramic capacitors
1n is marked as "102"
100n is marked as "104"
Orientation doesn't matter. Put them in place and bend the solder legs outwards, so they don't
all when turning around the board.
Solder all ceramic capacitors in place. On the next page you can see how your PCB should look
by now.
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3 1n C28,C29,C30
6 100n C12,C14,C16,C19,C25,C31

CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
STEP 4 (Main PCB)
Power header
Turn around the board and place the Pin Header like shown below.
Put some tape, to hold them in place while soldering rom the other side.
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1 HDR-M-2.54_2X5 H4

CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
STEP 5 (Main PCB)
Transistor
Take the 2N3904, put it in place and make sure the orientation is correct. The outline o the
transistor has to match with the silkscreen on the PCB. You can bend the 2 outer legs o each
transistor, so it doesn't all out when turning around the board.
The ootprint is quite small, so stay ocused and don't use too much solder to avoid shorts.
Check your solder joints with a magni ier and/or multimeter when in doubt.
STEP 6 (Main PCB)
IC sockets
Oriantation is important to know how to place the ICs later! The notch should ace upwards,
matching the print on the PCB.
You can use tape to hold them in place, put the other PCB on top, or bend 2 pins o each socket
inwards, so they don't all when turning the board around. Then solder everything.
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3 IC Socket 14P n

CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
STEP 7 (Main PCB)
Toggle Switch
Pin headers
Place the toggle switch in the correct spot.
Take the 8-Pin Headers (Male) and Sockets (Female) and stick them together. Place them on the
Main PCB, with the emale header down, but don't solder yet!
Below you can see the correct placement o the switch and the pin headers.
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CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
STEP 8
Control PCB
Now take the other PCB and it it on top, so the sha t o the switch goes in the big hole and all
pins o the male headers are showing through their solder pads. Fit the nuts to the switch and
care ully turn the board around. Solder the Switch irst, it will hold together the 2 PCBs while
soldering the pin headers on both sides (both PCBs).
STEP 9 (control PCB)
Resistors
A ter removing the nut rom the switch and care ully taking apart the two PCBs, place and
solder the resistors on the control PCB as shown below.
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3 1k R135,R176,R221,R232
1 4k7 R138,R235
2 47k R227,R228
7 100k
R147,R154,R155,R177,R217,R218,R219,R220,
R222,R223,R224,R225,R226,R233

CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
STEP 10 (Control PCB)
LED
For the LED the orientation is important! The longer leg goes in the upper hole, while the lat
side o the LED points down.
Solder it lush to the PCB.
STEP 17 (control PCB)
Controls
Now take the Potentiometers and jacks and put them in place as marked on the PCB but don't
solder yet.
On the next page you can see the placement
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1 LED-TH-3mm_W LED13
7 B100K AM,EXT,REF,SEL1,SEL2,SUB/2,SUB/4
5 PJ-301M J36,J37,J38,J39,J42

CubuSynth Engine - Build Guide PCB V1.1 Jul 2022
When everything is in place, put the ront panel on top, so all controls go into each
corresponding hole o the panel. Make sure everything its well.
Fit all nuts to the Potentiometers and Jacks.
Be care ul when turning the boards around, so that the components stay in place.
Then solder everything.
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