4 layers173.2 × 52.5 mm
6 layers50 × 28 mm
OBSmini PCB
MegaC-C/OBSmini_hardwareThis repository includes all the essential PCB and 3D printing files required for the OBSmini hardware.
- Size
- 50 × 28 mm
- Copper layers
- 6
- Thickness
- 7.78 mm
- Parts
- 136
- Nets
- 81
- Pads
- 358
- Tracks, vias
- 720, 220
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 3 Jul 2023
- Updated
- 30 Jul 2023
Overview
OBSmini PCB is an open-source printed circuit board by MegaC-C, from the MegaC-C/OBSmini_hardware repository on GitHub. It is a 6-layer board of 50 × 28 mm with 136 parts on 81 nets, routed with 720 tracks and 220 vias.
It is built around the NRF52833-QDAA-R, MCP6002T-E/MC and LMV321, with the TP4057, AO3400A and BAV99 among its other parts. Its parts include 61 capacitors, 34 resistors, 9 diodes, 6 ICs and 5 transistors. It belongs with the nRF52 and nRF5x boards of this library.
Main components
9
NRF52833-QDAA-R
QFN-40-EP(5x5)QFN-40-EP(5x5) Microcontrollers (MCU/MPU/SOC) ROHSNordic SemiconMicrocontrollers (MCU/MPU/SOC)
MCP6002T-E/MC
DFN-8-EP(2x3)-40℃~+125℃ 1.8V~6V 100uA 1MHz 1pA 1pA 2 23mA 28nV/√Hz@1kHz 2uV/℃ 4.5mV 600V/ms 76dB Rail-to-Rail Input, Rail-to-Rail Output DFN-8-EP(2x3) Operational Amplifier ROHSMicrochip TechnologyOperational Amplifier
LMV321
SOT-23-5L-2.75V~-1.25V、1.25V~2.75V 0℃~+70℃ 1 10pA 10pA 1MHz 2.1V~5.5V 20mA 20nV/√Hz@10kHz 520V/ms 60uA 70dB 800uV Built-in compensation Rail-to-Rail Input, Rail-to-Rail Output SOT-23-5L Operational Amplifier ROHSJiangsu Changjing Electronics Technology (CJ)Operational Amplifier
TP4057
SOT-23-6-40℃~+85℃ 1 25uA 4.24V 4V~6.5V Charging IC Lithium Battery Not supported SOT-23-6 Battery Management ROHSTECH PUBLICBattery Management
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsBAV99
SOT-231 Pair Series Connection 1.25V@150mA 100V 215mA 250mW 4A 4ns 500nA@80V SOT-23 Switching Diodes ROHSNexperiaSwitching DiodesAO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsQ13FC1350000400
SMD3215-2PSMD3215-2P Crystals ROHSSeiko EpsonCrystals
X322532MOB4SI
SMD3225-4P-40℃~+85℃ 12pF 32MHz 40Ω Crystal Oscillator ±10ppm ±20ppm SMD3225-4P Crystals ROHSYXCCrystals
README
README.mdOBSmini Hardware
This repository includes all the essential PCB and 3D printing files required for the OBSmini hardware.
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.
"Basic Parts" are utilized whenever tolerances permit, while "Extended Parts" are employed only when absolutely necessary.
5 PCBs cost 50€ (including parts, assembly and shipping).
NFC Antenna PCB
This is simply a PCB antenna tuned to the NFC pins of the nRF52833.
3D Printed Case
Fusion 360 Project and three .stl files of OBSmini Case (Top, Spacer, Bottom).
Parts
136| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C6, C14, C17, C308, C309, C315, C322, C328, C337 |
| 8 | 6.8nF | Capacitor_SMD:C_0402_1005Metric | C302, C306, C307, C310, C311, C313, C319, C321 |
| 6 | 100uF | Capacitor_SMD:C_1206_3216Metric | C304, C305, C323, C324, C325, C333 |
| 6 | 1M | Resistor_SMD:R_0402_1005Metric | R1, R307, R311, R312, R314, R328 |
| 6 | 3.3k | Resistor_SMD:R_0402_1005Metric | R309, R313, R319, R320, R323, R326 |
| 5 | 1k | Resistor_SMD:R_0402_1005Metric | R2, R6, R7, R308, R317 |
| 5 | 1nF | Capacitor_SMD:C_0402_1005Metric | C8, C312, C318, C326, C331 |
| 4 | 100nF | Capacitor_SMD:C_0402_1005Metric | C5, C7, C11, C26 |
| 4 | 100pF C0G | Capacitor_SMD:C_0603_1608Metric | C18, C19, C21, C22 |
| 4 | 12pF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C15, C16 |
| 4 | 220pF | Capacitor_SMD:C_0402_1005Metric | C316, C317, C329, C330 |
| 4 | 22pF | Capacitor_SMD:C_0402_1005Metric | C314, C320, C327, C332 |
| 4 | 68k | Resistor_SMD:R_0402_1005Metric | R310, R321, R322, R327 |
| 4 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q301, Q302, Q303, Q304 |
| 4 | Pad | Connector_Wire:SolderWirePad_1x01_SMD_1x2mm | H1, H2, H3, H4 |
| 4 | RB521S30T5G | Diode_SMD:D_SOD-523 | D303, D304, D305, D306 |
| 3 | 1pF | Capacitor_SMD:C_0402_1005Metric | C3, C4, C9 |
| 3 | 47uF | Capacitor_SMD:C_0805_2012Metric | C334, C335, C336 |
| 3 | MCP6002T | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U301, U302, U303 |
| 2 | 1 | Resistor_SMD:R_1206_3216Metric | R301, R302 |
| 2 | 1.0uF | Capacitor_SMD:C_0402_1005Metric | C12, C13 |
| 2 | 10nF | Capacitor_SMD:C_0402_1005Metric | C301, C303 |
| 2 | 120k | Resistor_SMD:R_0402_1005Metric | R318, R325 |
| 2 | 20k | Resistor_SMD:R_0402_1005Metric | R316, R324 |
| 2 | 20pF C0G | Capacitor_SMD:C_0402_1005Metric | C20, C23 |
| 2 | 33k | Resistor_SMD:R_0402_1005Metric | R305, R306 |
| 2 | 4.7k | Resistor_SMD:R_0402_1005Metric | R303, R304 |
| 2 | BAV99 | Package_TO_SOT_SMD:SOT-23 | D301, D302 |
| 2 | Conn_01x01 | Connector_PinHeader_1.27mm:PinHeader_1x01_P1.27mm_Vertical | J9, J10 |
| 2 | LED_red | LED_SMD:LED_0603_1608Metric | D1, D3 |
| 2 | ToolingHole | OBSmini_PCB:ToolingHoleJLCPCB | H5, H6 |
| 2 | Transducer | OBSmini_PCB:Transducer@Transformer | LS301, LS302 |
| 2 | Transformer_1:1:15 | OBSmini_PCB:B78416A2430A003 | T301, T302 |
| 1 | 100pF | Capacitor_SMD:C_0402_1005Metric | C10 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 10uH | Inductor_SMD:L_1206_3216Metric | L3 |
| 1 | 15nH | Inductor_SMD:L_0402_1005Metric | L4 |
| 1 | 2k | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | 3.9nH | Inductor_SMD:L_0402_1005Metric | L1 |
| 1 | 330 | Resistor_SMD:R_0402_1005Metric | R329 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q305 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_1.27mm:PinHeader_2x05_P1.27mm_Vertical | J2 |
| 1 | LED_blue | LED_SMD:LED_0603_1608Metric | D4 |
| 1 | LMV321 | Package_TO_SOT_SMD:SOT-23-5 | U304 |
| 1 | LOGO | LOGO | G*** |
| 1 | NRF52833-QDAA | OBSmini_PCB:NRF52833-QDAA-R7 | U1 |
| 1 | PCB_Antenna | OBSmini_PCB:nRF_pcbAntenna | AE201 |
| 1 | Q13FC1350000400 | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y2 |
| 1 | TP4057 | Package_TO_SOT_SMD:TSOT-23-6 | U2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | OBSmini_PCB:USB_C_SHOU-HAN-TYPE-C-6P | J1 |
| 1 | X322532MOB4SI | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
Questions
How big is the OBSmini PCB PCB?
It measures 50 × 28 mm and has 6 copper layers, 7.78 mm thick.
What parts does the OBSmini PCB use?
136 parts, built around the NRF52833-QDAA-R, MCP6002T-E/MC, LMV321 and TP4057. 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 OBSmini PCB KiCad files?
From the MegaC-C/OBSmini_hardware repository on GitHub, at the commit this page was made from: the board is OBSmini_PCB/OBSmini_PCB.kicad_pcb and its schematic OBSmini_NFC_Antenna_PCB/OBSmini_NFC_Antenna_PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the OBSmini PCB design in my own project?
Its repository states no licence, so its author keeps all rights: ask MegaC-C before reusing the design.
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