2 layers58 × 110 mm
2 layers60.5 × 110 mm
Brain core
shmoergh/moduleur222Fully analog DIY-friendly modular synth
- Size
- 60.5 × 110 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 104
- Nets
- 101
- Pads
- 414
- Tracks, vias
- 762, 373
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 1 Jun 2025
- Updated
- 27 Oct 2026
Overview
Brain core is an open-source printed circuit board by shmoergh, from the shmoergh/moduleur repository on GitHub. It is a 2-layer board of 60.5 × 110 mm with 104 parts on 101 nets, routed with 762 tracks and 373 vias.
It is built around the TL072, MCP4822-E/P and 74HC4051, with the 74HC4053BQ, MMBT3904 and BAT54S among its other parts. Its parts include 37 resistors, 20 capacitors, 12 connectors, 11 ICs and 6 diodes. It belongs with the audio and music boards and the RP2040 boards of this library.
Main components
7
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
MCP4822-E/P
PDIP-8-40℃~+125℃ 12 12LSB 2 2.7V~5.5V 20MHz 4.5us 415uA 50ppm/℃ Built-in Built-in SPI Voltage Buffer PDIP-8 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)
74HC4051
SOP-16-40℃~+85℃ 1 170MHz 28ns 29ns 3V~9V 5ns 5pF 80Ω 8:1 SOP-16 Analog Switches, Multiplexers ROHSWuxi I-core ElecAnalog Switches, Multiplexers
74HC4053BQ
DHVQFN-16-EP(2.5x3.5)-40℃~+125℃ 20ns 21ns 2:1 2V~10V 3 5ns 80Ω DHVQFN-16-EP(2.5x3.5) Analog Switches, Multiplexers ROHSNexperiaAnalog Switches, Multiplexers
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)BAT54S
SOT-231 Pair Series Connection 1V@100mA 200mA 2uA@25V 30V 600mA SOT-23 Schottky Diodes ROHSMDDSchottky DiodesBAT54
SOT-23200mA 2uA@25V 30V 800mV@100mA Independent SOT-23 Schottky Diodes ROHSFOSANSchottky Diodes
README
modules/08-default-patch/README.mdHog Moduleur / Default Patch
An optional passive PCB which connects the modules of the Shmøergh Moduleur. This essentially creates a default patch which makes the Moduleur playable without patch cables.
How to Build
Module specific instructions
🐛 3D model bug in schematics
The current version of the 3D model has two bugs:
- It incorrectly uses dual row headers. Single row, long pin headers should be used on the BACK side of the PCB so that it can connect to the UI board through the holes on the Core board.
- The side of the ADSR+VCA1, ADSR+VCA2 and UTILS pin headers are wrong. All pin headers should be soldered on the BACK side of the PCB.
License
Open source licensed under CC BY-NC 4.0.
Feel free to fork, build, and tweak.
Latest module version
v1.0
Parts
104| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 100k | Resistor_SMD:R_0603_1608Metric | R1, R14, R15, R16, R17, R18, R19, R20, R21, R24, R26, R30, R31, R32, R33 |
| 13 | 100n | Capacitor_SMD:C_0603_1608Metric | C3, C6, C7, C8, C9, C12, C13, C14, C15, C16, C17, C19, C20 |
| 6 | 1k | Resistor_SMD:R_0603_1608Metric | R12, R13, R22, R23, R34, R35 |
| 5 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4, U5, U8, U9, U11 |
| 4 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q3, Q6, Q7 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2, H3, H4 |
| 3 | 1N5817 | Diode_SMD:D_SOD-323 | D1, D2, D3 |
| 3 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5, J9, J10 |
| 3 | Conn_02x03_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J1, J4, J8 |
| 2 | 100u | Capacitor_SMD:CP_Elec_6.3x7.7 | C4, C5 |
| 2 | 10k | Potentiometer_THT:Potentiometer_ACP_CA6-H2,5_Horizontal | RV_CV_GAIN1, RV_CV_GAIN2 |
| 2 | 120k | Resistor_SMD:R_0603_1608Metric | R25, R27 |
| 2 | 22p | Capacitor_SMD:C_0603_1608Metric | C10, C11 |
| 2 | 3.3k | Resistor_SMD:R_0603_1608Metric | R2, R7 |
| 2 | 33k | Resistor_SMD:R_0603_1608Metric | R28, R29 |
| 2 | 47k | Resistor_SMD:R_0603_1608Metric | R8, R9 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R36, R37 |
| 2 | 62k | Resistor_SMD:R_0603_1608Metric | R10, R11 |
| 2 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D5, D6 |
| 2 | Conn_02x02_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J2, J3 |
| 2 | LOGO | Shmoergh_Logo:Gyeszno | G***, G*** |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 10u | Capacitor_SMD:CP_Elec_4x5.4 | C1 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C18 |
| 1 | 120 | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 2.2k | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 330n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2 |
| 1 | 6N137 | Package_SO:SOP-8_6.605x9.655mm_P2.54mm | U2 |
| 1 | 7.5k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 74HC4051 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U10 |
| 1 | 74HC4053B | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U7 |
| 1 | BAT54 | Package_TO_SOT_SMD:SOT-23 | D4 |
| 1 | Conn_01x01 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J11 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J_DEV1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J13 |
| 1 | Conn_02x05_Odd_Even | Connector_IDC:IDC-Header_2x05_P2.54mm_Horizontal | J6 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J7 |
| 1 | LM7805_TO220 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U1 |
| 1 | MCP4822 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U6 |
| 1 | Pico | Module:RaspberryPi_Pico_Common_Unspecified | U3 |
| 1 | SW_SPST | Button_Switch_THT:SW_Tactile_SKHH_Angled | SW1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J_USB_C_EXTENSION1 |
The 101 most common of 104 parts.
Questions
How big is the Brain core PCB?
It measures 60.5 × 110 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Brain core use?
104 parts, built around the TL072, MCP4822-E/P, 74HC4051 and 74HC4053BQ. 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 Brain core KiCad files?
From the shmoergh/moduleur repository on GitHub, at the commit this page was made from: the board is modules/07-brain/electronics/core/brain-core.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Brain core design in my own project?
Its repository states no licence, so its author keeps all rights: ask shmoergh before reusing the design.
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