2 layers140 × 72.5 mm
Nixie proj
dm2lct/Nixieclock_kit
This is a Nixie-clock controlled by a ESP8266 module with NTP and MQTT support.
119 parts9GPL-3.0
2 layers37.5 × 28.5 mm
SEPIC
Wudker/DC_Converter- Size
- 37.5 × 28.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 18
- Pads
- 86
- Tracks, vias
- 109, 93
- Pours
- 11
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 22 Sep 2026
- Updated
- 19 Oct 2026
Overview
SEPIC is an open-source printed circuit board by Wudker, from the Wudker/DC_Converter repository on GitHub. It is a 2-layer board of 37.5 × 28.5 mm with 34 parts on 18 nets, routed with 109 tracks and 93 vias.
It is built around the LM3478MA, AO4262E and AO4407A, with the PMEG045T030EPDZ among its other parts. Its parts include 9 capacitors, 9 resistors, 3 diodes, 2 transistors and 2 inductors.
Main components
4
LM3478MA
SOIC-8-40℃~+125℃@(TJ) 1 1MHz 2.97V~40V Boost Boost、SEPIC、Flyback External No SOIC-8 DC-DC Converters ROHSTexas InstrumentsDC-DC ConvertersAO4262E
SOIC-8-55℃~+150℃ 1 N-channel 1.2V 1.652nF 16.5A 30nC@10V 52pF 6.5mΩ@10V 60V SOIC-8 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
AO4407A
SOP-8-55℃~+150℃ 1 P-Channel 1.8V 14A 2.05nF 20nC@4.5V、40nC@10V 3.1W 300pF 30V 330pF 9.5mΩ@10V、14.7mΩ@4.5V SOP-8 MOSFETs ROHSUMWMOSFETs
PMEG045T030EPDZ
SOT1289-55℃~+175℃ 1 Independent 3A 45V 480mV@3A SOT1289 Schottky Diodes ROHSNexperiaSchottky Diodes
README
README.mdDC_Converter
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 1k | Resistor_SMD:R_1206_3216Metric | R3, R4, R6 |
| 2 | 22u | Capacitor_SMD:CP_Elec_6.3x5.8 | C3, C4 |
| 2 | 4.7u | HCM0703-4R7-R:INDPM7166X300N | L1, L2 |
| 2 | Vin_syg | LED_SMD:LED_1206_3216Metric | D1, D3 |
| 1 | 100n | Capacitor_SMD:C_1206_3216Metric | C6 |
| 1 | 100p | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | 10m | Resistor_SMD:R_1206_3216Metric | R7 |
| 1 | 10u | Capacitor_SMD:C_1206_3216Metric | C5 |
| 1 | 15k | Resistor_SMD:R_1206_3216Metric | R2 |
| 1 | 1n | Capacitor_SMD:C_1206_3216Metric | C9 |
| 1 | 2.2k | Resistor_SMD:R_1206_3216Metric | R1 |
| 1 | 2.5k | Resistor_SMD:R_1206_3216Metric | R9 |
| 1 | 20 | Resistor_SMD:R_1206_3216Metric | R5 |
| 1 | 20k | Resistor_SMD:R_1206_3216Metric | R8 |
| 1 | 220n | Capacitor_SMD:C_1206_3216Metric | C8 |
| 1 | 4,7n | Capacitor_SMD:C_1206_3216Metric | C7 |
| 1 | 560u | Capacitor_SMD:CP_Elec_8x10 | C2 |
| 1 | AO4262E | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | Q2 |
| 1 | AO4407A | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | Q1 |
| 1 | BZX84-A10,215 | Package_TO_SOT_SMD:SOT-23 | Z1 |
| 1 | GND_in | TestPoint:TestPoint_THTPad_4.0x4.0mm_Drill2.0mm | TP4 |
| 1 | GND_out | TestPoint:TestPoint_THTPad_4.0x4.0mm_Drill2.0mm | TP3 |
| 1 | LM3478MA | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | LOGO | Logo_footprint:Logo_15_15 | G*** |
| 1 | LOGO | Logo_footprint:Logo_10_6 | G*** |
| 1 | PMEG045T030EPDZ | Package_TO_SOT_SMD:Nexperia_CFP15_SOT-1289 | D2 |
| 1 | Vin | TestPoint:TestPoint_Plated_Hole_D2.0mm | TP2 |
| 1 | Vout | TestPoint:TestPoint_Plated_Hole_D2.0mm | TP1 |
Questions
How big is the SEPIC PCB?
It measures 37.5 × 28.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SEPIC use?
34 parts, built around the LM3478MA, AO4262E, AO4407A and PMEG045T030EPDZ. 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 SEPIC KiCad files?
From the Wudker/DC_Converter repository on GitHub, at the commit this page was made from: the board is Hardware/PCB/SEPIC.kicad_pcb and its schematic Hardware/PCB/SEPIC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SEPIC design in my own project?
Its repository states no licence, so its author keeps all rights: ask Wudker before reusing the design.
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