2 layers100 × 76 mm
2 layers177 × 114 mm
PowerUnit
oosan1/OU_PowerUnit- Size
- 177 × 114 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 133
- Nets
- 58
- Pads
- 340
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Jun 2026
- Updated
- 22 Jun 2026
Overview
PowerUnit is an open-source printed circuit board by oosan1, from the oosan1/OU_PowerUnit repository on GitHub. It is a 2-layer board of 177 × 114 mm with 133 parts on 58 nets.
It is built around the M78AR033-1, M78AR05-1 and NE555P, with the NJM7812FA, XT30PW-M and CC0603KRX7R9BB104 among its other parts. Its parts include 38 capacitors, 35 connectors, 26 resistors, 10 diodes and 5 ICs.
Main components
12M78AR033-1
SIP,11.6x7.5mm-40℃~+85℃ 1 10.2mm 11.6mm 1A 2200uF 3.3V 300uA 50mVp-p 6V~36V 7.5mm 80%、90% 850kHz Plastic encapsulated type Short Circuit Protection、Automatic fault recovery Step-down type ±1% SIP,11.6x7.5mm DC-DC Power Modules ROHSYLPTECDC-DC Power Modules
M78AR05-1
SIP,11.6x7.5mm-40℃~+85℃ 1 10.2mm 11.6mm 1A 2200uF 300uA 50mVp-p 5V 7.5mm 7V~36V 85%、94% 850kHz Plastic encapsulated type Short Circuit Protection、Automatic fault recovery ±1% SIP,11.6x7.5mm DC-DC Power Modules ROHSYLPTECDC-DC Power Modules
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
NJM7812FA
TO-220F-40℃~+150℃@(Tj) 1 1.5A 12V 30V 6mA 71dB@(120Hz) 75uV Fixed Over Current Protection、Over Temperature Protection Positive TO-220F Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSNisshinbo Micro Devices Inc.Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
XT30PW-M
-- Power connector / plug connector ROHSChangzhou Amass ElecUncategorised
CC0603KRX7R9BB104
0603100nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMTA31CCQ24VDC1D
SOCKETABLEAutomotive RelaysCIT Relay and Switch
SS56C
SMCSchottky Diodeshongjiacheng
CL31A106KBHNNNE
120610uF 50V X5R ±10% 1206 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
CL21A475KAQNNNE
080525V 4.7uF X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
1206W4F0000
1206-55℃~+155℃ 0Ω 200V 250mW Thick Film Resistor ±1% ±800ppm/℃ 1206 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface MountCL21B474KBFNNNE
0805470nF 50V X7R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
README
README.mdOU_PowerUnit
Parts
133| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | Conn_01x02_Pin | OU_Conn:XT30U-M | J7, J8, J9, J10, J11, J16, J17, J20, J21, J23, J24, J27, J28, J29 |
| 8 | 0.1u | Capacitor_SMD:C_0603_1608Metric | C1, C2, C5, C7, C10, C17, C33, C37 |
| 8 | Conn_01x02_Pin | OU_Conn:Hirose_DF1EC-2P-2.5DSA_1x02_P2.5mm_Vertical | J12, J14, J26, J31, J32, J33, J34, J35 |
| 5 | Conn_01x02_Pin | OU_Conn:AMASS_XT30PW-M | J2, J3, J4, J5, J6 |
| 5 | LED | LED_THT:LED_D5.0mm | D1, D3, D5, D8, D10 |
| 4 | 1.5k | Resistor_SMD:R_0603_1608Metric | R10, R16, R20, R22 |
| 4 | 1000u | Capacitor_THT:CP_Radial_D16.0mm_P7.50mm | C3, C4, C31, C35 |
| 4 | 100u | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C12, C19, C25, C29 |
| 4 | 12k | Resistor_SMD:R_0603_1608Metric | R9, R15, R19, R21 |
| 4 | 20k | OU_Reg:TRIM_3296W-1-250 | RV1, RV3, RV4, RV5 |
| 4 | 220u | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C6, C14, C21, C24 |
| 4 | 470u | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C13, C20, C27, C30 |
| 4 | 47u | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C8, C15, C22, C26 |
| 4 | Conn_01x07_Socket | OU_Power:YDS512F-Unit | J15, J18, J22, J25 |
| 3 | 2.2u | Capacitor_THT:C_Disc_D6.0mm_W4.4mm_P5.00mm | C9, C16, C23 |
| 3 | 7.5k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R7, R18 |
| 3 | A31CCQ24VDC1D | OU_Relay:DZ85AB5PCB_ForA31CCQ24VDC1D | K1, K2, K3 |
| 3 | SS56C | OU_Diode:DIODE_SS56C-HF_CIP | D6, D7, D9 |
| 2 | 10 | Resistor_SMD:R_0603_1608Metric | R4, R6 |
| 2 | 100 | Resistor_THT:R_Axial_DIN0516_L15.5mm_D5.0mm_P5.08mm_Vertical | R8, R17 |
| 2 | 10u | Capacitor_SMD:C_1206_3216Metric | C32, C36 |
| 2 | 2.2k | Resistor_SMD:R_0603_1608Metric | R23, R24 |
| 2 | 4.7u | Capacitor_SMD:C_0805_2012Metric | C34, C38 |
| 2 | Conn_01x02_Pin | OU_Conn:Hirose_DF1E-2P-2.5DS_1x02_P2.5mm_Horizontal | J13, J19 |
| 1 | 0 | Resistor_SMD:R_1206_3216Metric | R2 |
| 1 | 0.47u | Capacitor_SMD:C_0805_2012Metric | C18 |
| 1 | 10 | Resistor_THT:R_Axial_Power_L25.0mm_W9.0mm_P7.62mm_Vertical | R12 |
| 1 | 100 | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric | R14 |
| 1 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C11 |
| 1 | 120 | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_CathodeUp | D4 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R25 |
| 1 | 1m | OU_Reg:HoYLR2512E | R5 |
| 1 | 2.2u | Capacitor_SMD:C_0805_2012Metric | C28 |
| 1 | 22k | Resistor_SMD:R_0603_1608Metric | R13 |
| 1 | 2SK4017 | Package_TO_SOT_THT:TO-251-3_Vertical | Q1 |
| 1 | 30A | OU_Fuse:3557-15_KEY | F1 |
| 1 | 430 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R26 |
| 1 | 500k | OU_Reg:TRIM_3362P-1-103 | RV2 |
| 1 | Conn_01x02_Pin | OU_Conn:AMASS_XT60PW-M | J1 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J37 |
| 1 | INA226 | Package_SO:TSSOP-10_3x3mm_P0.5mm | U1 |
| 1 | M78AR033-1 | OU_Power:M78AR033-1 | U5 |
| 1 | M78AR05-1 | OU_Power:M78AR05-1 | U4 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U2 |
| 1 | NJM7812FA | OU_Power:NJM7812FA | U3 |
| 1 | SMCJ24A | OU_Diode:SMCJSeries_LTF | D2 |
| 1 | SW_Toggle_DPDT | OU_Switch:1MD6-T1-B1-M1-Q-N-S | SW1 |
The 125 most common of 133 parts.
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Questions
How big is the PowerUnit PCB?
It measures 177 × 114 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PowerUnit use?
133 parts, built around the M78AR033-1, M78AR05-1, NE555P and NJM7812FA. 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 PowerUnit KiCad files?
From the oosan1/OU_PowerUnit repository on GitHub, at the commit this page was made from: the board is Circuit/Old/PowerUnit/PowerUnit.kicad_pcb and its schematic Circuit/Old/PowerUnit/PowerUnit.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PowerUnit design in my own project?
Its repository states no licence, so its author keeps all rights: ask oosan1 before reusing the design.