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Mx unsaver main

nearestexit·mx-unsaver·mx-unsaver-main/mx-unsaver-main.kicad_pcb

Mx unsaver main PCB layout, top view — open source STM32 board by nearestexit
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About the Mx unsaver main PCB

Mx unsaver main is an open source STM32 PCB design by nearestexit, published on GitHub under the MIT license. It is a 2-layer board measuring 391.8 × 105.4 mm, with 229 components from 32 distinct parts.

Its main chip is the STM32F072CBTX, from the STM32 family. Other key parts include the XC6206PXXXMR. By type, the board carries 98 diodes, 9 capacitors, 9 resistors, 7 switches, 6 connectors and 2 ICs.

It belongs with the keyboards designs in this gallery.

From the project

Custom Keyboard & Numpad inspired by the IBM "Unsaver", built with Onshape and KiCad

Custom keyboard and numpad inspired by vintage Cherry keyboards and the IBM "Unsaver". Designed in Onshape and KiCad. Powered by QMK.

Case Source (Onshape): https://cad.onshape.com/documents/1d9e79a61d42e7395c429f47/w/28912f958105e1c831f67a9e/e/537bd51b2d234361e6d6eea3

Important: The PCB has the words "Made In Germany" printed on it. This is because it was actually manufactured in Germany. If you choose to have it manufactured in China, please remove this logo from the PCB.

Mx unsaver main, from the project README
From the project README

Main components on the Mx unsaver main

STM32F072CBTXXC6206PXXXMR

Mx unsaver main bill of materials (BOM)

229 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F072CBTX
STM32F072CBTx
U1
1
XC6206PXXXMR
XC6206PxxxMR
U2
2
CONN_01X02
Conn_01x02
J1, J2
1
CONN_01X04_MOUNTINGPIN
Conn_01x04_MountingPin
J3
2
CONN_01X01
Conn_01x01
J4, J5
1
CONN_01X20_MOUNTINGPIN
Conn_01x20_MountingPin
J6
2
MadeInGermany
G1, G2
78
MX_SW_solder
MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +70
6
MX_SW_solder
MX15, MX18, MX91, MX97, MX100, MX110
7
MX_SW_solder
MX17, MX92, MX93, MX95, MX119, MX122, MX126
3
MX_SW_solder
MX121, MX123, MX127
1
MX_SW_solder
MX124
1
MX_SW_solder
MX125
1
MX_stab
S1
4
MX_stab
S2, S3, S4, S5
1
MX_stab
S6
1
MX_stab
S7
89
1N4148W-FDI
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +81
1
LED_LAYER2
D71
1
LED_LAYER3
D72
Show 12 more
QtyPartRefs
1
LED_LAYER4
D73
1
LED_CAPS2
D78
1
LED_CAPS1
D86
1
LED_LAYER5
D87
1
67-1058
LED_NUM
D135
1
67-1058
LED_SCLK
D136
1
LED_LAYER1
D137
4
100N
100n
C1, C2, C5, C7
3
1u
C3, C8, C9
2
4.7U
4.7u
C4, C6
1
10K
10k
R1
8
1k
R2, R3, R4, R6, R8, R17, R18, R19

Mx unsaver main design files

The KiCad project lives in the nearestexit/mx-unsaver repository on GitHub; these links point at the commit this page was built from.

Mx unsaver main: common questions

What microcontroller does the Mx unsaver main use?

The Mx unsaver main is built around the STM32F072CBTX, from the STM32 family.

How big is the Mx unsaver main PCB?

The Mx unsaver main measures 391.8 × 105.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mx unsaver main?

229 components, from 32 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Mx unsaver main design files?

From the nearestexit/mx-unsaver repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Mx unsaver main design in my own project?

Yes, under the terms of its MIT license, which nearestexit chose for the repository.

Can I test firmware for the Mx unsaver main 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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