HardLabs

Bmcv

Bemeier·bmcv·pcb/BMCV.kicad_pcb

Bmcv PCB layout, top view — open source STM32 board by Bemeier

About the Bmcv PCB

Bmcv is an open source STM32 PCB design by Bemeier, published on GitHub under the CC-BY-SA-4.0 license. It is a 4-layer board measuring 80 × 108 mm, with 370 components from 40 distinct parts.

Its main chip is the STM32G474CETx, from the STM32 family. Other key parts include the PEL12T-4225S-S1024, WS2811F, MCP23S17_SS, TXS0108EPW and AD7367-5. By type, the board carries 169 resistors, 110 capacitors, 42 ICs, 16 switches, 14 connectors and 4 inductors.

It belongs with the audio and displays & leds designs in this gallery.

From the project

Macro CV controller for eurorack inspired by the Emblematic Systems Catalyst

Eight scene-crossfaded LFOs in 16HP, with a PLL that locks them to an incoming clock. This repository is the firmware, and three other things that run the same firmware: a headless simulator, a browser frontend, and a VCV Rack module.

bemeier.github.io/bmcv is that frontend, built and deployed from main. It runs the module with no install, shows a physical one over USB if you have the hardware, and carries the manual, a firmware updater and a diagnostics page.

Bmcv, from the project README
From the project README

Main components on the Bmcv

PEL12T-4225S-S1024WS2811FMCP23S17_SSTXS0108EPWAD7367-5AD5754RSTM32G474CETxMB85RS64PNF-G-JNERE1OPA4171TLV7673374AHCT1G125

Bmcv bill of materials (BOM)

370 components, 40 distinct parts.

QtyPartRefs
8
PEL12T-4225S-S1024
U1, U2, U3, U4, U5, U6, U7, U8
21
WS2811F
U9, U10, U11, U12, U13, U14, U15, U16 +13
2
MCP23S17_SS
U30, U31
1
TXS0108EPW
U32
1
AD7367-5
U33
2
AD5754R
U34, U35
1
STM32G474CETx
U36
1
MB85RS64PNF-G-JNERE1
U37
3
OPA4171
U38, U39, U40
1
TLV76733
U41
1
74AHCT1G125
U42
1
38.4MHz 10pF
Y1
12
AudioJack2_SwitchT
J1, J2, J3, J4, J5, J6, J7, J8 +4
1
USB_C_Receptacle_USB2.0_14P
J14
1
Conn_02x08_Eurorack
J16
1
SMD1206P110TF
F1
12
SD12C-01FTG
RV1, RV2, RV3, RV4, RV5, RV6, RV7, RV8 +4
1
R_Potentiometer_Dual
RV13
13
TC002-N11AS2XT-RGB
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +5
1
FN1
SW14
Show 20 more
QtyPartRefs
1
FN2/Boot
SW15
1
FN3
SW16
4
470R
FB1, FB2, FB3, FB4
2
10p
C1, C2
33
100n
C3, C4, C5, C6, C12, C13, C18, C26 +25
4
1u
C7, C9, C10, C16
21
10n
C8, C44, C45, C47, C49, C50, C52, C53 +13
19
100n
C14, C17, C19, C20, C21, C22, C23, C24 +11
3
22u
C15, C97, C98
18
10u
C60, C63, C66, C68, C69, C70, C71, C72 +10
2
680n
C85, C86
8
220n
C104, C105, C106, C107, C108, C109, C110, C111
2
5k1
R1, R2
64
10k
R3, R41, R84, R85, R86, R87, R88, R89 +56
12
1M
R5, R10, R11, R12, R13, R14, R15, R16 +4
36
100
R6, R7, R8, R9, R33, R34, R35, R36 +28
12
100
R17, R18, R19, R20, R25, R26, R27, R28 +4
21
33
R42, R64, R65, R66, R67, R68, R69, R70 +13
21
10
R43, R44, R45, R46, R47, R48, R49, R50 +13
1
1k
R158

Bmcv design files

The KiCad project lives in the Bemeier/bmcv repository on GitHub; these links point at the commit this page was built from.

Bmcv: common questions

What microcontroller does the Bmcv use?

The Bmcv is built around the STM32G474CETx, from the STM32 family.

How big is the Bmcv PCB?

The Bmcv measures 80 × 108 mm, has 4 copper layers and is 1.6062 mm thick.

How many components are on the Bmcv?

370 components, from 40 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bmcv design files?

From the Bemeier/bmcv repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Bmcv design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which Bemeier chose for the repository.

Can I test firmware for the Bmcv without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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