Stop Redesigning the Same Circuits
KiCad schematics, PCB layouts, BOMs, and design notes for the most common hardware building blocks. Verified, documented, and ready to integrate.
Choose Your Approach
Templates
Download KiCad source files and integrate them into your own design. Full control, customizable, perfect for learning.
PCB Composer
Select tiles, configure signals, and receive a routed board. No KiCad knowledge required. Production files ready in 24h.
Every project re-invents the same wheel
Li-Ion charger, 3.3 V buck, ESP32 bringup circuit. You've designed each one before — or spent hours hunting for a verified reference you can trust.
These templates are the circuits we reach for in professional production hardware: clean layouts, pre-screened EU BOMs, and design notes explaining every non-obvious decision.
All Templates
Li-Ion Battery Charger (MCP73832)
A compact, single-cell Li-Ion/Li-Po charging circuit based on the Microchip MCP73832. Includes thermal and over-charge protection, status LED, and EU supplier BOM.
3.3 V Buck Converter (TPS62821)
High-efficiency synchronous step-down converter based on TI TPS62821. Delivers 3 A at 3.3 V from 4–17 V input with >90 % efficiency. Layout follows TI reference guidelines.
ESP32-S3 Minimal Circuit
Minimal but complete ESP32-S3 circuit with QSPI flash, auto-download, USB-C with ESD protection, and RF layout best practices. Drop-in ready for IoT and wireless products.
USB-C PD Frontend (FUSB302)
Fully featured USB Power Delivery negotiation front-end using the onsemi FUSB302. Supports up to 20 V/3 A PD contracts, including protection circuit for downstream loads.
ADC Frontend with Filtering
Op-amp signal conditioning front-end with anti-aliasing filter and input protection. Designed for interfacing 0–5 V industrial sensors to 3.3 V MCU ADC inputs.
Battery fuel gauge + gas gauge IC
USB-C PD sink controller
Don't see what you need?
Request a custom template — describe the circuit and we'll build it.
Request a templateSave with Bundles
Pre-assembled sets of templates that work together. Save up to 25 % compared to buying individually.
Power Pack
-32%Everything you need to power a battery-operated IoT device: Li-Ion charging, buck regulation, and USB-C PD input. All three designs integrate and share decoupling planes.
ESP32 Complete System
-21%The full ESP32-S3 hardware system: minimal core circuit, 3.3 V supply, Li-Ion charging, and USB-C PD front-end. Build a wireless product from this foundation.
IoT Starter Bundle
-19%Sensor-to-cloud in one package: ESP32-S3 core + ADC frontend for analog sensors + regulated 3.3 V supply. Perfect for automation and monitoring projects.
Greenhouse Controller — built entirely from templates
A complete wireless greenhouse monitoring and control system designed exclusively by combining three templates from this catalog. No custom power or communication circuits from scratch.
The build log documents every integration decision: how the Li-Ion charger, buck converter, ESP32-S3 module, and ADC front-end fit together on a single board.
What every template includes
KiCad Schematic
Fully annotated with selection notes and test-point references.
PCB Layout
2-layer, DRC clean, Gerber-ready for JLCPCB / PCBWay / Aisler.
BOM (Excel + CSV)
Pre-screened EU suppliers — Mouser, TME, Farnell, plus alternates.
Design Notes PDF
Component selection rationale, integration tips, and known pitfalls.
3D STEP Model
Ready for Fusion 360, FreeCAD, or any MCAD tool for enclosure work.
Lifetime updates
BOM revision corrections and schematic improvements pushed free.
Need a custom template or integration help?
We offer custom template design and hardware design services for teams who need something beyond the catalog.