2 layers45.1 × 102.5 mm
4 layers65.8 × 128.5 mm
Don midi2cv
jomag/synth-project2Experimental Eurorack Synth DIY Project
- Size
- 65.8 × 128.5 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 113
- Nets
- 121
- Pads
- 351
- Tracks, vias
- 623, 135
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 15 Aug 2019
- Updated
- 18 May 2025
Overview
Don midi2cv is an open-source printed circuit board by jomag, from the jomag/synth-project repository on GitHub. It is a 4-layer board of 65.8 × 128.5 mm with 113 parts on 121 nets, routed with 623 tracks and 135 vias.
It is built around the TL072, 1N914BWS and B5819W. Its parts include 32 resistors, 22 capacitors, 11 connectors, 10 ICs and 7 diodes. It belongs with the audio and music boards and the STM32 boards of this library.
Main components
3
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
1N914BWS
SOD-323F150mA 4A 5uA@75V 720mV@5mA 75V Independent SOD-323F Diodes - General Purpose ROHSonsemiDiodes - General Purpose
B5819W
SOD-123-55℃~+125℃ 1.5A 1mA@40V 25A 40V 600mV@1A Standalone SOD-123 Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdProject files for an experimental, DIY modular synth in Eurorack format.
Casing
Threaded strips: 2x5x432 mm (also available in 203.2 mm). Hole distance: 5.08 mm.
https://gie-tec.de/product/threaded-strips/?lang=en
References
A lot of generic and module specific design tips: http://dintree.com/
Precision tuning of the AS3340 VCO https://cabintechglobal.com/tune3340 http://www.alfarzpp.lv/eng/sc/Tuning%20the%20AS3340.pdf
CEM3340 VCO (Voltage Controlled Oscillator) designs https://electricdruid.net/cem3340-vco-voltage-controlled-oscillator-designs/
Kassutronics blog: VCO CEM3340: https://kassu2000.blogspot.com/2018/06/vco-3340.html
Collection of a few simple Eurorack module PCB and some notes about components etc: https://github.com/nickajeglin/Eurorack-pcbs
Understanding audio jack switches https://www.cuidevices.com/blog/understanding-audio-jack-switches-and-schematic
Timo Rozendal CEM3340 VCO design http://www.timorozendal.com/files/cem3340vco_schematic.pdfs
Parts
113| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C7, C8, C12, C13, C14, C15, C17, C18, C19, C20, C21, C22, C23 |
| 9 | 0 | Resistor_SMD:R_0603_1608Metric | R12, R13, R30, R31, R32, R33, R34, R35, R36 |
| 8 | R | Resistor_SMD:R_0603_1608Metric | R18, R19, R20, R21, R22, R23, R24, R25 |
| 7 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3, TP17, TP18, TP19, TP20 |
| 5 | R | Potentiometer_SMD:Potentiometer_Bourns_TC33X_Vertical | RV1, RV2, RV3, RV4, RV5 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4, U5, U8, U9 |
| 4 | TestPoint_Small | TestPoint:TestPoint_Pad_D1.5mm | TP4, TP5, TP6, TP7 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R3, R7 |
| 3 | 10u | Capacitor_SMD:C_0805_2012Metric | C6, C10, C11 |
| 3 | 1k? | Resistor_SMD:R_0603_1608Metric | R9, R10, R11 |
| 3 | 330 | Resistor_SMD:R_0603_1608Metric | R26, R27, R28 |
| 3 | SolderJumper_3_Bridged12 | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP1, JP2, JP3 |
| 2 | 100r@100MHz | Inductor_SMD:L_0805_2012Metric | FB1, FB2 |
| 2 | 10p | Capacitor_SMD:C_0603_1608Metric | C4, C5 |
| 2 | 20p | Capacitor_SMD:C_0603_1608Metric | C2, C3 |
| 2 | 220 | Resistor_SMD:R_0603_1608Metric | R15, R17 |
| 2 | MCP4922-ESL | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U6, U7 |
| 2 | amber? | LED_SMD:LED_0603_1608Metric | D4, D5 |
| 2 | green | LED_SMD:LED_0603_1608Metric | D2, D3 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C16 |
| 1 | 1N914BWS | Diode_SMD:D_SOD-323F | D7 |
| 1 | 2k2 | Resistor_SMD:R_0603_1608Metric | R14 |
| 1 | 2k2? | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 32kHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | 390 | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 4k7 | Resistor_SMD:R_0603_1608Metric | R16 |
| 1 | 500 mA? | Fuse:Fuse_0603_1608Metric | F1 |
| 1 | 6N138 | Package_SO:SOP-8_6.62x9.15mm_P2.54mm | U3 |
| 1 | 8MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y2 |
| 1 | B5819W | Diode_SMD:D_SOD-123 | D1 |
| 1 | CV1 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J10 |
| 1 | CV2 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J11 |
| 1 | Conn_02x03_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | Conn_02x08_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J3 |
| 1 | DIN-5_180degree | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | GATE1 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J8 |
| 1 | GATE2 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J9 |
| 1 | MIDICLK | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J7 |
| 1 | NCP1117-3.3_SOT223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | STM32F030C8Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | TL431DBZ | Package_TO_SOT_SMD:SOT-23 | U10 |
| 1 | UART | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J5 |
| 1 | VEL1 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J12 |
| 1 | VEL2 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J13 |
| 1 | midi_panel_mount | custom:DIN Panel Mount Electrokit | E1 |
| 1 | red | LED_SMD:LED_0603_1608Metric | D6 |
The 112 most common of 113 parts.
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Questions
How big is the Don midi2cv PCB?
It measures 65.8 × 128.5 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Don midi2cv use?
113 parts, built around the TL072, 1N914BWS and B5819W. 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 Don midi2cv KiCad files?
From the jomag/synth-project repository on GitHub, at the commit this page was made from: the board is midi/rev0/don-midi2cv.kicad_pcb and its schematic midi/rev0/don-midi2cv.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Don midi2cv design in my own project?
Its repository states no licence, so its author keeps all rights: ask jomag before reusing the design.