DIY
Off-Grid Septic Systems in Klamath County, Oregon: Site Evaluation, Branch Selection, and Owner-Installed Cost
The soil picks the system, not the budget. A regulatory-first path from test pit to permitted drainfield on volcanic upland ground.
DIY
Biomaterials
Can You Make Bioplastics in a Home Workshop? Eight Polymer Families, Numeric Recipes, Under $600 of Tooling
Eight bio-polymer families, 24 numeric recipes, under $600 of tooling. Drying energy costs $3 to $6 per kg, usually more than the polymer itself.
DIY
Off-Grid ESP32 Flood-Stage Sensor: Cutting Standby From 20 mA to Under 100 µA on a $70 Solar Node
Full open-hardware build: ultrasonic stage sensing, LiFePO4 pack, and the dev-board parasitic draw that wastes 89% of a node's daily energy.
DIY
Century-Lifespan Consumer Products: What Reliability Physics, Aviation Precedent, and Repair Law Say About 100-Year Electronics
No consumer electronic has lasted a century. Reliability physics, aviation PMA precedent, and EU repair law define what 100-year design needs.
DIY
HorizonSight 360° a Helmet-Integrated Rear-Awareness AR and Mission-Control Vision System
HorizonSight 360 gives a helmeted operator eyes in the back of their head, and gives their team eyes everywhere at once.
DIY
Free Open Source Compact Car (FOSCC): Build a Street-Legal DIY Car From Salvage Parts for Under $10,000
Open-hardware plans for a street-legal DIY compact car: salvaged 4-cylinder powertrain on a builder-welded steel frame for under $10,000.
DIY
Discord Spam Bot Protection: 4 Ways to Lock Down Your Server
Spam bots overwhelming your Discord server? Compare four protection options, from custom verification bots to manual vetting.
Batteries
What Is the Voltaic Pile? How the First Chemical Battery Worked
Learn how Alessandro Volta’s voltaic pile worked, how it was built, and why it became the first practical chemical battery.
Science
DIY Alpha Radiation Detector: PIN Photodiode Build Under $30
Build a working alpha radiation detector with a decapped PIN photodiode and charge-sensitive amp for under $30. Includes the paper-sheet test.
Offgrid
DIY Push Sickle-Bar Mower: Open-Hardware Plans / Recycled Salvage
Open-hardware plans for a push sickle-bar mower: salvage-first BOM, honest physics, and why a ~$120 electric-assist build beats a $4,000 BCS.