CubuSynth 4VCLFO User manual

CubuSynth 4VCLFO- Build Guide SMD PCB V1.2 Dec2022
4VCLFO
Quad voltage controlled Triangle LFO
Build Guide
SMD PCB V1.2 Dec2022
Written and Illustrated by Ruben Sponar
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CubuSynth 4VCLFO- Build Guide SMD PCB V1.2 Dec2022
Introduction
The 4VCLFO is our LFOs with triangle Outputs in 10hp. It eatures a knob or the
Frequency o each LFO and CV inputs with attenuators.
The „Aux“ input is normalized to the our CV inputs, so you can modulate all LFOs with
one signal at the same time. Plugging a cable into the CV input breaks its connection
rom the aux input.
This way you can create more interesting Modulations or your Patches.
Tools Required
Soldering iron (+wire)
side-cutter
Nut wrench / driver M8
- optional:
Digital Multimeter
Helping (third) hand / PCB holder
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CubuSynth 4VCLFO- Build Guide SMD PCB V1.2 Dec2022
BUIL GUI E
STEP 1
LEDs
Place the LEDs like shown below.
Orientation o the LEDs is Important. The longer leg o the LED goes in the squared hole.
Make sure to have the colors placed as below to correctly indicate the LFOs Polarity.
One o each color represents positive or negative Output voltage or each LFO. In this case green
stands or positive and blue or negative voltages.
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CubuSynth 4VCLFO- Build Guide SMD PCB V1.2 Dec2022
STEP 2
Power Header
Place the Pin Header or Power like shown here.
Orientation o the Power Header is very important to be able to insert the power cable the
correct way.
Put some tape, to hold it in place while soldering rom the other side.
You can also solder only one pin, while holding the Power header in place. Then solder the
remaining Pins.
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CubuSynth 4VCLFO- Build Guide SMD PCB V1.2 Dec2022
STEP 3
Electrolytic capacitors
Place the capacitors on the PCB with the white line o the capacitor acing down towards the
white mark on the PCB. The longer leg o the capacitor goes through the hole marked with "+"
You can bend the solder legs outwards, like shown below, to keep them rom alling out.
Then solder and cut the legs.
You can easily customize the LFO speeds to your taste. Choosing larger capacitors will make the
LFO slower. You can also choose a di erent value or each o the our LFOs.
Here is some capacitor values with LFO times / requency ranges:
LFO 1 – capacitor C12
LFO 2 – capacitor C13
LFO 3 – capacitor C14
LFO 4 – capacitor C15
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cap. Value seconds frequency (hz)
10uf: 140~5 sec 0.007~0.2 hz
4.7uf: 70~2.5 sec 0.014~0.4 hz
1uf: 14~0.5 sec 0.07~2 hz
0.1uf: 0.5~0.014 sec 2~70 hz

CubuSynth 4VCLFO- Build Guide SMD PCB V1.2 Dec2022
STEP 4
Controls
Now take the Potentiometers and jacks and put them in place as marked on the PCB but don't
solder yet.
In the picture you can see the placement.
When everything is in place, take the ront panel and put it on top, so all controls go into each
corresponding hole o the panel. "wiggle" the ront panel into place and make sure everything
its well.
Fit all nuts to the Potentiometers and the Jacks.
Be care ul when turning the boards around, so that all the components stay in place.
Then solder everything.
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CubuSynth 4VCLFO- Build Guide SMD PCB V1.2 Dec2022
STEP 4
inal check
Check your soldering. I you see shorts or bad solder joints, ix it
up. Then check the power pins or shorts with your multimeter. I
everything looks ine, you can place the knobs, so the pointer is
correctly orientated and push them down.
Now you can install the module in your rack and have un
patching!
Help
Please understand that we can't guarantee or your DIY module to work. Nevertheless we will do
our best to guide you through the build or to solve problems when needed.
In case there should be parts missing in your Full DIY kits contact us to ask or replacement /
I you have trouble with your build, you can contact us at:
[email protected]
To be able to identi y mistakes in your build, please include high quality pictures o your
soldered PCBs, ront+back.
https://cubusynth.com/
https://www. acebook.com/cubusynth
https://www.instagram.com/cubusynth_modular/
https://www.etsy.com/shop/CubuSynth
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