kevindarrah.com

Dedicated to Design

INTRODUCTION

Kevin Darrah designs electronics and shows the work. This page is the front door: project documentation lives on the wiki, build videos are on YouTube, finished hardware is in the Tindie store, and custom design work runs through KD Circuits. Pick a pin in Table I and follow the trace.

THE PROJECT WIKI

Every project is documented end to end — schematics, board layouts, firmware, test notes, and the missteps that didn't make the final cut. If it was built, it's written up.

Visit the wiki →

DESIGN SERVICES — KD CIRCUITS

KD Circuits takes projects from idea to fab-ready files: schematic capture, PCB layout, prototyping, and design review. Bring a napkin sketch or a half-finished board; it leaves as something a fab house will accept.

Start a project →

Figure 1. Typical Application Circuit.

THE YOUTUBE CHANNEL

Long-form build videos, tutorials, and teardowns — the same projects from the wiki, explained on the bench.

Watch the builds →

THE TINDIE STORE

Boards and kits from the projects, assembled and tested before they ship. When a design proves useful on the bench, it ends up in the store.

Shop on Tindie →

TABLE I. QUICK REFERENCE

NAME

FUNCTION

WIKI

Project documentation — visit the wiki

DESIGN

KD Circuits services — start a project

SHOP

Tindie store — browse hardware

WATCH

YouTube channel — watch the builds

GITHUB

Source code & firmware — browse the repos

NOTE 1: All pins are rated for continuous curiosity.

CONTACT

Questions, project inquiries, or a board that won't boot — transmit directly:

FIGURE 2. LIVE BENCH — CIRCUIT SIMULATOR

Now on the bench: …

OPEN FULL SIM

Figure 2. A random example circuit loads on every visit — poke at it, it's a real simulator. Drag components, right-click to edit values, watch the scopes.