2 layers40 × 26 mm
Wireless power secondary
sofiamonty/toothbrush-charger-pcb
Two-board wireless charging system modeled on an electric toothbrush; custom PCBs designed in KiCad with inductive coupling for power transfer.
11 parts
2 layers66 × 26 mm
Wireless power primary
sofiamonty/toothbrush-charger-pcbTwo-board wireless charging system modeled on an electric toothbrush; custom PCBs designed in KiCad with inductive coupling for power transfer.
- Size
- 66 × 26 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 15
- Pads
- 53
- Tracks, vias
- 129, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 20 Jun 2026
- Updated
- 20 Jun 2026
Overview
Wireless power primary is an open-source printed circuit board by sofiamonty, from the sofiamonty/toothbrush-charger-pcb repository on GitHub. It is a 2-layer board of 66 × 26 mm with 19 parts on 15 nets, routed with 129 tracks and 0 vias.
It is built around the IR2302PBF, NA555P and IRFZ44N, with the EG1218, MKS4C033302C00KSSD and UKL1H0R1KDDANA among its other parts. Its parts include 7 capacitors, 3 resistors, 3 connectors, 2 ICs and 2 transistors.
Main components
6
IR2302PBF
PDIP-8-40℃~+150℃ 130ns 1mA 2 200mA 350mA 50ns 5V~20V Enable shutdown、Interleaved conduction protection、Dead-time control Half-Bridge IGBT、MOSFET PDIP-8 Gate Drivers ROHSInfineon TechnologiesGate Drive ICs
NA555P
PDIP-8-40℃~+105℃ 100kHz 4.5V~16V PDIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
IRFZ44N
TO-220110pF 130W 18mΩ@10V 39nC@10V 430pF 4V 50A 60V 880pF N-Channel TO-220 MOSFETs ROHSOSENMOSFETs
EG1218
插件-20℃~+70℃ 11.6mm 200mA 30V 4mm 7.4mm Black PC Pin Rectangular Columnar SPDT Through Hole Plugin Slide Switches ROHSE-SwitchSlide SwitchesMKS4C033302C00KSSD
--55℃~+125℃ 330nF 63V Metallized Polyethylene Terephthalate (PET) ±10% - Film Capacitors ROHSWIMAFilm CapacitorsUKL1H0R1KDDANA
插件,D5xL12mm-40℃~+105℃ 1.1mA@120Hz 1000hrs@105℃ 100nF 12mm 2mm 50V 5mm ±10% 插件,D5xL12mm Aluminum Electrolytic Capacitors - Leaded ROHSNichiconAluminum Electrolytic Capacitors - Leaded
README
README.mdWireless Toothbrush Charger, KiCad PCB Design
A two-board wireless power transfer system modelled on an electric toothbrush charger, designed as part of a group university project.
Project overview
The system consists of two custom PCBs communicating through inductive coupling: a primary board acting as the charger base, and a secondary board acting as the battery pack receiver. Component values were calculated individually for the specific power transfer requirements rather than taken directly from a reference design.
Repository structure
toothbrush-charger-pcb/ │ ├── wireless-power-primary/ │ ├── wireless-power-primary.kicad_pcb # PCB layout — charger base │ ├── wireless-power-primary.kicad_sch # Schematic — charger base │ ├── wireless-power-primary.kicad_pro # KiCad project file │ └── wireless-power-primary.csv # Bill of materials │ ├── wireless-power-secondary/ │ ├── wireless-power-secondary.kicad_pcb # PCB layout — battery pack │ ├── wireless-power-secondary.kicad_sch # Schematic — battery pack │ ├── wireless-power-secondary.kicad_pro # KiCad project file │ └── wireless-power-secondary.csv # Bill of materials │ └── README.md
Design details
- Both boards designed in KiCad from schematic capture through DRC
- 4-layer stack-up with EMC-aware routing
- Inductive coupling optimised to minimise power loss across the air gap
- Components soldered by hand and system validated using oscilloscope and multimeter
- Output levels verified against design targets
Tools used
- KiCad (schematic capture, PCB layout, DRC)
- Oscilloscope and multimeter for validation
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 0.1uF | Capacitor_THT:CP_Axial_L10.0mm_D4.5mm_P15.00mm_Horizontal | C3, C4, C5 |
| 3 | 282834-2 | SamacSys_Parts:282834-2_1 | J1, J2, J3 |
| 2 | 1kΩ | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R3 |
| 2 | IRFZ44N | Package_TO_SOT_THT:TO-220-3_Vertical | Q1, Q2 |
| 1 | 10kΩ | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R2 |
| 1 | 10nF | Capacitor_THT:CP_Axial_L10.0mm_D4.5mm_P15.00mm_Horizontal | C1 |
| 1 | 1N5819 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1nF | Capacitor_THT:CP_Axial_L10.0mm_D4.5mm_P15.00mm_Horizontal | C2 |
| 1 | EG1218 | SamacSys_Parts:EG1218 | S1 |
| 1 | IR2302 | Package_DIP:DIP-8_W7.62mm | U2 |
| 1 | MKS4C033302C00KSSD | SamacSys_Parts:MKS4C033302C00KSSD | C7 |
| 1 | NA555P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | UKL1H0R1KDDANA | SamacSys_Parts:CAPPRD200W50D550H1200 | C6 |
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Questions
How big is the Wireless power primary PCB?
It measures 66 × 26 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Wireless power primary use?
19 parts, built around the IR2302PBF, NA555P, IRFZ44N and EG1218. 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 Wireless power primary KiCad files?
From the sofiamonty/toothbrush-charger-pcb repository on GitHub, at the commit this page was made from: the board is wireless-power-primary/wireless-power-primary.kicad_pcb and its schematic wireless-power-primary/wireless-power-primary.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Wireless power primary design in my own project?
Its repository states no licence, so its author keeps all rights: ask sofiamonty before reusing the design.