HardLabs

OBSmini

MegaC-C·OBSmini_hardware·OBSmini_PCB/OBSmini_PCB.kicad_pcb

OBSmini PCB layout, top view — open source Nordic nRF board by MegaC-C

About the OBSmini PCB

OBSmini is an open source Nordic nRF PCB design by MegaC-C, published on GitHub. It is a 6-layer board measuring 50 × 28 mm, with 135 components from 50 distinct parts.

Its main chip is the C2895249, from the Nordic nRF family. Other key parts include the C12044, C7377 and C7972. By type, the board carries 61 capacitors, 34 resistors, 9 diodes, 6 ICs, 5 transistors and 4 connectors.

From the project

This repository includes all the essential PCB and 3D printing files required for the OBSmini hardware.

The files needed to order at JLCPCB are in /production folder *************************************************************

This is the KiCad project of the OBSmini_PCB.

The Bill of Materials (BOM) and layout take inspiration from the reference designs mentioned in the schematic. However, they are primarily optimized for availability and cost-effectiveness, particularly for assembly services provided by JLCPCB.

Main components on the OBSmini

C2895249C12044C7377C7972

OBSmini bill of materials (BOM)

135 components, 50 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C2895249
NRF52833-QDAA
U1
1
C12044
TP4057
U2
3
C7377
MCP6002T
U301, U302, U303
1
C7972
LMV321
U304
4
C20917
AO3400A
Q301, Q302, Q303, Q304
1
C15127
AO3401A
Q305
1
C9009
X322532MOB4SI
Y1
1
C32346
Q13FC1350000400
Y2
1
C668623
USB_C_Receptacle_PowerOnly_6P
J1
1
Conn_02x05_Odd_Even
J2
2
Conn_01x01
J9, J10
1
PCB_Antenna
AE201
4
Pad
H1, H2, H3, H4
2
ToolingHole
H5, H6
2
Transducer
LS301, LS302
2
Transformer_1:1:15
T301, T302
2
C2286
LED_red
D1, D3
1
C72041
LED_blue
D4
2
C2500
BAV99
D301, D302
4
C896535
RB521S30T5G
D303, D304, D305, D306
Show 30 more
QtyPartRefs
1
C14033
3.9nH
L1
1
C1051
10uH
L3
1
C27143
15nH
L4
4
C1547
12pF
C1, C2, C15, C16
3
C1550
1pF
C3, C4, C9
4
C307331
100nF
C5, C7, C11, C26
9
C23733
4.7uF
C6, C14, C17, C308, C309, C315, C322, C328 +1
5
C1523
1nF
C8, C312, C318, C326, C331
1
C1546
100pF
C10
2
C52923
1.0uF
C12, C13
4
C14858
100pF C0G
C18, C19, C21, C22
2
C1554
20pF C0G
C20, C23
2
C15195
10nF
C301, C303
8
C1542
6.8nF
C302, C306, C307, C310, C311, C313, C319, C321
6
C15008
100uF
C304, C305, C323, C324, C325, C333
4
C1555
22pF
C314, C320, C327, C332
4
C1530
220pF
C316, C317, C329, C330
3
C16780
47uF
C334, C335, C336
6
C26083
1M
R1, R307, R311, R312, R314, R328
5
C11702
1k
R2, R6, R7, R308, R317
1
C4109
2k
R3
1
C25744
10k
R8
2
C17928
1
R301, R302
2
C25900
4.7k
R303, R304
2
C25779
33k
R305, R306
6
C25890
3.3k
R309, R313, R319, R320, R323, R326
4
C36871
68k
R310, R321, R322, R327
2
C25765
20k
R316, R324
2
C25750
120k
R318, R325
1
C25104
330
R329

OBSmini design files

The KiCad project lives in the MegaC-C/OBSmini_hardware repository on GitHub; these links point at the commit this page was built from.

OBSmini: common questions

What microcontroller does the OBSmini use?

The OBSmini is built around the C2895249, from the Nordic nRF family.

How big is the OBSmini PCB?

The OBSmini measures 50 × 28 mm, has 6 copper layers and is 7.78 mm thick.

How many components are on the OBSmini?

135 components, from 50 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 OBSmini design files?

From the MegaC-C/OBSmini_hardware 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 OBSmini design in my own project?

The repository has no license, so all rights stay with MegaC-C. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the OBSmini without the hardware?

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

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