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CubuSynth Dual CS-20 VCF Build Manual

Dual / stereo multimode vcf with self-oscillating resonance and intuitive routing and cv modulation matrix
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CubuSynth Dual CS-20 VCF - Build Guide
PCB V1.4 Mar 2023
Dual CS-20 VCF
Dual / Stereo Multimode VCF with Self-oscillating Resonance and
intuitive Routing and CV modulation Matrix
Build Guide
PCB V1.4 March 2023
Written and Illustrated by Ruben Sponar
Page 1

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Summary of Contents for CubuSynth Dual CS-20 VCF

  • Page 1 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 Dual CS-20 VCF Dual / Stereo Multimode VCF with Self-oscillating Resonance and intuitive Routing and CV modulation Matrix Build Guide PCB V1.4 March 2023 Written and Illustrated by Ruben Sponar...
  • Page 2 PCB V1.4 Mar 2023 Introduction The CubuSynth Dual CS-20 VCF is a dual / stereo multimode VCF / Phaser / VCO, inspired by the legendary Korg MS-20, with CV control over frequency and resonance. The resonance can self-oscillate and features a 1V/Oct input, stable over at least 2~3 octaves.
  • Page 3 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 BUILD GUIDE STEP 1 (Main PCB) 1N4148 Diodes 1N4148 D2,D1 Identify 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.
  • Page 4 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 Here is a picture of all resistors in place. To help keeping track of the already placed components, print the BOM and cross out the parts you already soldered.
  • Page 5 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 STEP 4 (Main PCB) IC sockets IC-Socket 14pin U3,U6,U8,U9 IC-Socket 16pin U5,U2,U1 Look for the dip-14 and dip-16 sockets. Oriantation is important to know how to place the ICs later! The place for the notch is marked on the PCB with a "D...
  • Page 6 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 STEP 6 (Main PCB) 1nf ceramic capacitors 1n ceramic C5,C4 The 1nf ceramic capacitors are marked as "102" Place them in their spots and bend the solder legs outwards.
  • Page 7 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 STEP 7 (Main PCB) 4.7nf ceramic capacitors C6,C3 Find the 4.7nf ceramic capacitors They are marked as "472" Place them as shown in the picture and solder them from the other side of the board.
  • Page 8 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 STEP 9 (Main PCB) Transistors 2N3906 Q6,Q5,Q4,Q3,Q2,Q1 Take the 2N3906 transistors, put them in place and make sure the orientation is correct. The outline of the transistor has to match with the silkscreen on the PCB like shown in the picture.
  • Page 9 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 STEP 11 (Main PCB) Power header EURORACK10 Turn around the board and place the Pin Header for Power like shown. Orientation of the Power Header is very important to be able to insert the power cable the correct way.
  • Page 10 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 STEP 13 (Main PCB) Trimmer 3296W Trimmer 1k (102) RP1_102, RP2_102 3296W Trimmer 100k (104) RP3_104 Place the 100k Trimmer according to the marking on the PCB, like shown in the picture.
  • Page 11 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 Now place the other PCB on top, so all Pins go into their holes and fix the PCBs together with the M3 screw. Then you can solder all Pins on both sides (both PCBs) After that, you can unscrew the M3 screws/header and carefully take apart the 2 Boards.
  • Page 12 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 Resistors in place STEP 16 (control PCB) LEDs LED-TH-3mm_R LED4,LED3,LED2,LED1 Place the LEDs on the PCB. Orientation is Important! The longer leg goes into the square hole. Bend the solder legs outwards so they stay in place and solder them.
  • Page 13 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 STEP 17 (control PCB) Controls B100K Pot CUTOFF,LP-HP-1,LP-HP-2,RESO B100K Tall Trimmer CV1A,CV2A,RCV1A,RCV2A, PJ-301M CV1,CV2,IN1,IN2,OUT1,OUT2,RCV1,RCV2,V/O1 First, place fix the M3 spacer, like shown in the picture. Now take the Potentiometers and jacks and put them in place as marked on the PCB but don't solder yet.
  • Page 14 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 STEP 18 Installing ICs and final check TL074 / TL084 U3,U6,U8,U9 LM13700 U5,U2,U1 Take the Main PCB and install the Ics. Bend the Legs of the Ics inwards a bit so they form a 90°...
  • Page 15 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 Step 20 – Calibration The Calibration process contains the two trimmers for the 1V/octave scaling and an Offset for the second Filters frequency to have them both on the same resonant frequency.
  • Page 16 CubuSynth Dual CS-20 VCF - Build Guide PCB V1.4 Mar 2023 Help Please understand that we can't guarantee for your DIY module to work. Nevertheless we will do our best to guide you through the build or to solve problems when needed.