2 layers215 × 100 mm
2 layers83 × 69 mm
Midi2cv
shmoergh/hog124Fully analog two-voice monophonic synth for live performances
- Size
- 83 × 69 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 88
- Pads
- 213
- Tracks, vias
- 343, 18
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 27 Oct 2024
- Updated
- 13 Jul 2025
Overview
Midi2cv is an open-source printed circuit board by shmoergh, from the shmoergh/hog repository on GitHub. It is a 2-layer board of 83 × 69 mm with 46 parts on 88 nets, routed with 343 tracks and 18 vias.
It is built around the LM358 and MCP4822-E/P. Its parts include 19 resistors, 11 capacitors, 6 ICs and 2 diodes. It belongs with the audio and music boards and the RP2040 boards of this library.
Main components
2
LM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational 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)
README
README.mdHog
Fully analog two-voice monophonic synth for live performances.
Details and user guide: shmoergh.com
Latest revision: rev #3.
Build
The HOG is a very fun but equally advanced electronics project. It's fully open source and we've put together a build guide for the brave ones who decide to build one. Let us know if you have questions and definitely share some pics of your builds (follow Shmøergh on Instagram).
BOMs
The HOG consists of 5 separate boards which you can find in the boards folder. Each board has it's own gerber files for JLCPCB PCB and Mouser BOMs in the board's production folders. The Core and Filter boards have SMD components too for which you can find JLCPCB assembly files (BOM and position) in the production/jlcpcb folder.
Cloning
The MIDI2CV module uses pico-lib submodule. Make sure you clone
the repo like with its submodules:
git clone --recurse-submodules git@github.com:shmoergh/hog.gitLicense
Shmoergh Hog © 2024
Hardware is licensed under CC BY-NC 4.0
Software is licensed under MIT.
Font used on PCBs: https://departuremono.com
Simulations made in CircuitJS
Disclaimer
All electronic projects and designs presented on this web site, or associated web sites should be considered dangerous if not lethal if not used safely. When working on projects based on the designs on this site, use extreme care to ensure that you do not come into contact with mains AC voltages or high voltage DC. If you are not confident about working with mains voltages, or high voltages, or you are not legally allowed to work with mains voltages, or high voltages, you are advised not to attempt work on them. The author, host, and all people associated with these web pages disclaim any liability for damages should anyone be killed or injured while working on these projects, or projects based on these designs, or any other project or design presented on these web pages and any associated web pages. The author, host, and all people associated with these web pages also disclaim any liability for projects, or projects based on these designs, or any other project or design presented on these web pages and any associated web pages when used in such a way as to infringe relevant government regulations and by-laws.
All circuits, schematics, printed circuit board, panel design and associated data published on this site can be used for private use only.
We are not responsible for any errors in the PCB design or the parts list. All responsibility for ordering PCBs, components, and assembly services rests solely with you.
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 1k | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R10, R14, R15, R16, R19 |
| 3 | 100n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C3, C4, C11 |
| 3 | 22p | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C5, C10 |
| 2 | 100k | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R17 |
| 2 | 1u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C8, C9 |
| 2 | 220 | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R3 |
| 2 | 47k | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R12 |
| 2 | 51k | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R18 |
| 2 | 68k | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R13 |
| 2 | LM358 | Package_DIP:DIP-8_W7.62mm_LongPads | U3, U6 |
| 2 | MountingHole | MountingHole:MountingHole_3mm_Pad | H1, H2 |
| 1 | 10k | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | 10u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C7 |
| 1 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D2 |
| 1 | 22p | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C6 |
| 1 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q_GATE_LED1 |
| 1 | 330n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C2 |
| 1 | 4.7k | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 470 | Shmoergh_Custom_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11 |
| 1 | 6N138 | Package_DIP:DIP-8_W7.62mm_LongPads | U2 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J_SWCLKDIO1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J_OUT1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal | J_SWD_IO1 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J_IN1 |
| 1 | Jumper_2_Open | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | JP1 |
| 1 | LM7805_TO220 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U1 |
| 1 | MCP4822 | Package_DIP:DIP-8_W7.62mm_LongPads | U4 |
| 1 | Pico | MCU_RaspberryPi_and_Boards:RPi_Pico_SMD_TH | U5 |
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Questions
How big is the Midi2cv PCB?
It measures 83 × 69 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Midi2cv use?
46 parts, built around the LM358 and MCP4822-E/P. 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 Midi2cv KiCad files?
From the shmoergh/hog repository on GitHub, at the commit this page was made from: the board is boards/midi2cv/schematics/midi2cv.kicad_pcb and its schematic boards/core/experimental/core.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Midi2cv design in my own project?
Its repository states no licence, so its author keeps all rights: ask shmoergh before reusing the design.