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2 layers88.9 × 177.8 mmModulinVCO, the printed circuit board in 3D

This repository holds all data for th modulin I am building. The concept behind this design is to make a fully analog synthesizer using only standard components, with a fun control system based on a violin.

Size
88.9 × 177.8 mm
Copper layers
2
Thickness
1.6 mm
Parts
113
Nets
74
Pads
503
Tracks, vias
619, 44
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
7 May 2025
Updated
26 Aug 2026

Overview

ModulinVCO is an open-source printed circuit board by ConDarth, from the ConDarth/modulin repository on GitHub. It is a 2-layer board of 88.9 × 177.8 mm with 113 parts on 74 nets, routed with 619 tracks and 44 vias.

It is built around the TL072, LM7805 and BC548. Its parts include 48 resistors, 23 capacitors, 8 ICs, 5 transistors and 4 diodes.

Main components

3

README

README.md

Modulin

This repository holds all data for th modulin I am building. The concept behind this design is to make a fully analog synthesizer using only standard components, with a fun control system based on a violin. This project is mostly based on a design Martin Molin of Wintergatan. An explanation of his design can be found here.

My goal in improving this design is to make it more accessible. His design uses 9 or so prebuilt modules meant for modular synthesizers, each of which costs in the range of 70$+ making the instrument quite expensive for a diy build. I took inspiration from the modular synth DIY community to instead try and build the necessary modules from scratch using only much cheaper standard electronics components. The components I am limiting myself to are resistors, capacitors, inductors/transformers, diodes, transistors (both BJT and FET), op amps and linear voltage regulators.

Parts

113
QtyValueFootprintReferences
14100nUser:C_Axial_P5.00mm_CNCC6, C7, C8, C9, C12, C13, C14, C15, C16, C17, C20, C21, C22, C23
9B100kUser:Potentiometer_PanelMount_CNCRV1, RV2, RV7, RV8, RV14, RV15, RV16, RV17, RV18
6100kUser:Potentiometer_Trim_CNCRV5, RV6, RV9, RV10, RV11, RV13
5100k 1%User:R_2.54mm_CNCR14, R17, R24, R28, R31
5220kUser:R_10.16mm_CNCR2, R42, R43, R44, R45
4BC548User:TO-92_CNCQ1, Q2, Q4, Q5
4TL072User:DIP-8_CNCU5, U6, U7, U8
3100k 1%User:R_10.16mm_CNCR13, R16, R23
310kUser:R_10.16mm_CNCR8, R9, R25
3TL074User:DIP-14_CNCU1, U3, U4
2100kUser:R_2.54mm_CNCR3, R18
2100kUser:R_2.54mm_CNC_AltR19, R41
2100kUser:R_10.16mm_CNCR26, R32
2100nUser:C_Radial_Polarized_P3.8mm_CNCC10, C11
21N4148User:D_P7.62mm_CNCD3, D4
21k 1%User:R_10.16mm_CNCR34, R35
2220nUser:C_Axial_P5.00mm_CNCC4, C5
222kUser:R_2.54mm_CNCR5, R47
22k2User:R_10.16mm_CNCR33, R36
247kUser:R_10.16mm_CNCR22, R30
1100kUser:R_7.62mm_CNCR11
1100k 1%User:R_7.62mm_CNCR29
1100k 1%User:R_5.08mm_CNCR20
1100pUser:C_Axial_P5.00mm_CNCC1
1100pUser:C_Rect_P5.00mm_CNCC18
110k 1%User:R_10.16mm_CNCR39
110k 1%User:R_2.54mm_CNC_AltR40
110nUser:C_Rect_P5.00mm_CNCC2
118kUser:R_10.16mm_CNCR38
11MUser:R_10.16mm_CNCR7
11kUser:R_7.62mm_CNCR15
11kUser:Potentiometer_Trim_CNCRV4
120pUser:C_Axial_P5.00mm_CNCC3
1220kUser:R_2.54mm_CNCR4
122kUser:R_10.16mm_CNCR10
122kUser:R_5.08mm_CNC_AltR48
12M2User:R_10.16mm_CNCR1
12N7000User:TO-92_CNCQ3
133kUser:R_2.54mm_CNC_AltR27
1390User:R_5.08mm_CNCR37
147User:R_5.08mm_CNCR6
147kUser:R_7.62mm_CNCR21
147pUser:C_Rect_P5.00mm_CNCC19
150kUser:Potentiometer_Trim_CNCRV12
151kUser:R_2.54mm_CNCR46
151kUser:R_5.08mm_CNCR12
15V1User:D_P2.54mm_CNCD1
15V1User:D_P5.08mm_CNCD2
1A1MUser:Potentiometer_PanelMount_CNCRV3
1Conn_01x06_PinUser:TerminalBlock_1x6_CNCJ1
1LM7805User:TO-220_CNCU2
1SW_SPDTUser:SW_Slide_SPDT_H6.00mm_CNCSW1

The 108 most common of 113 parts.

Questions

How big is the ModulinVCO PCB?

It measures 88.9 × 177.8 mm and has 2 copper layers, 1.6 mm thick.

What parts does the ModulinVCO use?

113 parts, built around the TL072, LM7805 and BC548. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the ModulinVCO KiCad files?

From the ConDarth/modulin repository on GitHub, at the commit this page was made from: the board is modulinVCO/modulinVCO.kicad_pcb and its schematic modulinAmplifier/modulinAmplifier.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the ModulinVCO design in my own project?

Its repository states no licence, so its author keeps all rights: ask ConDarth before reusing the design.

More from ConDarth/modulin

7
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  • 2 layers76.2 × 50.8 mmModulinVCA, the printed circuit board in 3D

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  • 2 layers76.2 × 50.8 mmModulinAmplifier, the printed circuit board in 3D

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  • 2 layers74.9 × 62.2 mmModulinTest, the printed circuit board in 3D

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  • 2 layers76.2 × 50.8 mmModulinControl, the printed circuit board in 3D

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    This repository holds all data for th modulin I am building. The concept behind this design is to make a fully analog synthesizer using only standard components, with a fun control system based on a violin.

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  • 2 layers25.4 × 177.8 mmModulinPowerSupply, the printed circuit board in 3D

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