Mx unsaver numpad
About the Mx unsaver numpad PCB
Mx unsaver numpad is an open source STM32 PCB design by nearestexit, published on GitHub under the MIT license. It is a 2-layer board measuring 74.3 × 105.4 mm, with 45 components from 16 distinct parts.
Its main chip is the STM32F072CBTX, from the STM32 family. Other key parts include the XC6206PXXXMR. By type, the board carries 9 capacitors, 5 connectors, 3 switches, 2 ICs, 2 resistors and 1 diode.
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.
Main components on the Mx unsaver numpad
Mx unsaver numpad bill of materials (BOM)
45 components, 16 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32F072CBTX STM32F072CBTx | LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | XC6206PXXXMR XC6206PxxxMR | SOT-23-3 | U2 |
| 2 | CONN_01X01 Conn_01x01 | PinHeader_1x01_P2.54mm | J1, J2 |
| 2 | CONN_01X02 Conn_01x02 | PinHeader_1x02_P2.54mm_BOOT | J3, J4 |
| 1 | CONN_01X04_MOUNTINGPIN Conn_01x04_MountingPin | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J5 |
| 20 | MX_SW_solder | SW_MX_1u_PCBMount | MX1, MX3, MX4, MX5, MX6, MX7, MX9, MX10 +12 |
| 1 | MX_SW_solder | SW_MX_1u_PCBMount_NoRight | MX2 |
| 1 | MX_SW_solder | SW_MX_1u_PCBMount_NoLeft | MX8 |
| 1 | MX_SW_solder | SW_MX_1u_3pin | MX21 |
| 3 | MX_stab | STAB_MX_2u_FixedDistance | S1, S2, S3 |
| 1 | 67-1058 LED_NUM | LED_MX_3mm_Offset_Flipped | D1 |
| 4 | 100N 100n | C_0603_1608Metric | C1, C2, C5, C7 |
| 3 | 1u | C_0805_2012Metric | C3, C8, C9 |
| 2 | 4.7U 4.7u | C_0603_1608Metric | C4, C6 |
| 1 | 10K 10k | R_0805_2012Metric | R1 |
| 1 | 1k | R_0805_2012Metric | R2 |
Mx unsaver numpad 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 numpad: common questions
What microcontroller does the Mx unsaver numpad use?
The Mx unsaver numpad is built around the STM32F072CBTX, from the STM32 family.
How big is the Mx unsaver numpad PCB?
The Mx unsaver numpad measures 74.3 × 105.4 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Mx unsaver numpad?
45 components, from 16 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 numpad 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 numpad 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 numpad 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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