Engineering Tools

Free tools built for
real hardware engineers.

Every tool here solves a problem Dario sees repeatedly in PCB design reviews. No fluff. No email wall. Just use them.

Dario Fresu
Dario Fresu
Principal EMC Architect · Fresu Electronics
Fresu EMC Academy · Field Containment Series
Reference Card
The Propagation Channel

The foundational framework for EMI control through PCB layout. What a properly bounded channel looks like, the mental shift from current to fields, the 4 failure modes, and Dario's full vocabulary: dielectric, boundary, RRP, RRV, cavity.

Field containmentRRP / RRVMental modelVocabulary
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Layout Review
Is the Channel Intact?

A layout EMC review built around one question per checkpoint: is the propagation channel continuous here? 20 checkpoints across stack-up pairing, RRP continuity, layer transitions (RRV), and field environment. Live integrity score.

20 Checkpoints4 CategoriesLive ScoreVerdict
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Pre-Layout
Pre-Layout Channel Architecture

Define the propagation channels before the first trace is placed. 4 gates — stack-up architecture, RRP & transition planning, signal assignment, placement architecture — with gate logic and go/stop verdict.

4 Gates16 DecisionsGate LogicGo/Stop
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More free tools
More Free Tools
EMI Control Series
Top 10 PCB Design Mistakes for EMI Control

10 chapters covering every layout mistake that causes EMC test failures — with quizzes, self-audit, roadmap, certification exam and printable checklist.

10 ChaptersQuizzesSelf-AuditCert ExamPrintable
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Pre-Design
Hardware Specification Guide

5-step spec capture with gate reviews, live brief preview, risk register and PDF export. Define the product before you open the schematic tool.

5 StepsGate ReviewsRisk RegisterLive BriefPDF
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Pre-Layout
Pre-Layout Review Checklist

9 categories, 50+ items covering schematic organisation, signal integrity, protection and compliance. Complete before the first trace is placed.

9 Categories50+ ItemsNotesExportPDF
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Stackup Design
PCB Stackup Tool

Browse EMI-compliant stackup templates for 2-12 layers, or build your own and get a live EMC score with detailed findings. Includes return-path analysis, design rule checks, and a full reference of stackup terms and golden rules.

2-12 LayersLive EMC ScoreCheckerReturn PathsReference
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Signal Propagation
PCB Signal Propagation Visualiser

Animated visualisation of how signals travel through a PCB transmission line — wavefront, displacement current, E and H fields, live impedance matching.

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EMC Fundamentals
EMC Fundamentals Interactive Module

Core EMC theory, field behaviour and PCB design principles — interactive and self-paced.

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EM Fields
PCB EM Fields Visualiser

Visualise the electromagnetic field distribution on a PCB — understand how fields couple between layers and traces.

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EMC Design Kit
PCB EMC Design Kit

A practical design reference covering EMC-compliant PCB layout rules, decoupling strategies and filter selection.

Open Design Kit →