CubuSynth VCFA User manual

CubuSynth VCFA – Manual PCB V1.2 Sept 2022
VCFA
Multimode VCF with LP,HP and BP outputs and
integrated VCA
Manual
PCB V1.2 Sept 2022
Written and Illustrated by Ruben Sp nar
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CubuSynth VCFA – Manual PCB V1.2 Sept 2022
1. Introduction
The CubuSynth VCFA is a multim de VCF with LP,HP and BP m des with integrated VCA,
CV c ntr l ver Frequency, Res nance and V lume. The CV input f r the Frequency
features 1V/Oct scaling ver ab ut 2~3 ctaves. S y u can even create plucky mel dies
with the res nance in "ringing" m de.
The Gain c ntr l can reach a nice, s ft saturati n.
2. Specifications
Size: 10HP / 50mm
Depth: 34mm (measured fr m the fr nt panel)
Current Draw:
+12V: +14mA
-12V: -14mA
3. Key features
3 simultane us Outputs f r L w Pass, Band Pass and High Pass
Integrated VCA at the input stage
CV c ntr l ver V lume, Frequency and Res nance
"Ringing" m de n upper Res nance setting
1 V/ ct tracking ver 2~3 ctaves (with Freq CV attenuat r n 100%)
Saturati n n inc ming signal (VCA stage) n upper Gain setting
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CubuSynth VCFA – Manual PCB V1.2 Sept 2022
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CubuSynth VCFA – Manual PCB V1.2 Sept 2022
Limited Warranty:
CubuSynth guarantees this pr duct t be with ut defects in materials and w rkmanship f r a peri d f ne
year fr m the date f purchase (pr f f purchase/inv ice needed).
Malfuncti ns due t impr per supply v ltages, inc rrect r reversed Eur rack p wer cable c nnecti n,
misuse f the pr duct, rem val f kn bs, changing faceplates, r ther causes determined by CubuSynth
are the user's resp nsability and are n t c vered by this warranty.
During the warranty peri d, all defective pr ducts will be repaired r replaced, in the CubuSynth
w rksh p with the cust mer paying the shipping c sts t us.
CubuSynth takes n resp nsibility f r any damage t pers ns r equipment caused by the perati n f this
pr duct.
Please c ntact [email protected] m with any questi ns, auth rizati n f r return t manufacturer r any
needs and c mments.
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CubuSynth VCFA – Manual PCB V1.2 Sept 2022
VCFA
PCB V1.2 Sept 2022
Written and Illustrated by Ruben Sp nar
The CubuSynth VCFA was designed by Ruben Sp nar, fr m first pr t type in January 2021 t the finished m dule in
September 2022.
A few h n rable menti ns:
The main Filter circuit is based ar und the VCF-3 fr m Sculls&Circuits
The VCA part was riginally designed by T m Wiltshire (electric druid) and m dified f r the Input VCA stage and the
Res nance feedback path.
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