CubuSynth Engine V2 Manual de construção - Página 10
Procurar online ou descarregar pdf Manual de construção para Sintetizador CubuSynth Engine V2. CubuSynth Engine V2 11 páginas. Dual complex vco with wave shaping and modulation features
Imprimir páginaCubuSynth Engine V2 - Build Guide
SMD-PCB V1.1 Jul 2023
Step 19 - Callibration
Before your module is finished, you need to calibrate the trimmers on the back.
To do so, plug in the 16pin Eurorack Power cable correctly to your Bus board and the Module
while your rack is powered OFF! Make sure orientation is correct. (Red stripe to the -12V side).
Then turn on your case.
Sine wave callibration
Plug the sine wave output of VCO 1 to an oscilloscope.
There is two little single turn trimmers for each VCO. First adjust the "Sine Symmetry1" so the
wave looks the same on top and bottom ends, and swing around 0V. It may show values between
-4,5V to +4,5V and -5,5V to +5,5V.
Then adjust "Sine Round1", so the curve shows nice, rounded sine shapes.
You can also check with a frequency spectrum analyzer (most plugin EQs have one) and adjust to
keep the overtones as low as possible.
Then repeat for VCO 2.
1 V/octave tuning
To adjust the V/oct, plug a Keyboard/Sequencer or MIDI-interface, that produces 1V/oct signals
to the 1V/O input of VCO1. Play the lowest C and tune VCO1 to play a C. Then press the C1 on
your keyboard (one octave higher) and adjust the trimmer (without detuning on the Front) so
the tuning is exactly note C, one octave higher. Repeat those steps until the VCO always plays a
C when you play a C on the keyboard, and up to 10 octaves higher.
Repeat everything for VCO2.
If you prefer, you can also let a sequencer play through 4 octaves in 4 steps (C1, C2, C3, C4) and
turn the trimmer, until the tuner always shows the same note in different octaves.
If you don't have a tuning device, but a frequency counter (on the oscilloscope), you can replace
the notes with Hz. Tune down to exactly 100hz, the next octave should always double the
frequency to 200hz, then 400hz, 800hz, 1600hz and so on.
The HF trim might need to be adjusted. If, by playing in
higher frequencies (higher octaves) the V/O tracking is not
exact, turn up or down the trimmer, until the high octaves
are also stable in pitch.
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