Junkyard Genius

338 insane DIY builds from salvaged appliances, e-waste, chemicals, and junk.

Your microwave, fridge, old phones, dead laptops, busted printers, and that vacuum cleaner collecting dust in the garage? They're not trash. They're ingredients.

Every build is rated on 6 scales, includes sourced ingredients, step-by-step instructions, and safety notes. From "I just need a battery and a magnet" to "I'm building a rail gun from a microwave and a prayer."

🎯 Take the Build Finder Quiz — answer 6 questions, get personalized recommendations

🔍 Browse All Builds — search, filter, and sort every project

🎲 Feeling Lucky? — jump to a random build

🧰 My Toolbox — track your completed and want-to-build projects

Start Here

Not sure where to start? Build #042 — Grape Plasma. It takes 5 minutes, costs nothing, and you'll see actual plasma in your microwave. That's it. That's the hook.

Pick your comfort level and dive in. Each tier prepares you for the next.

Total Newbie — Brain Melt ⭐

No tools needed. Seriously. These builds use stuff already in your house.

Ready for Tinkerer? If you've done Grape Plasma and Homopolar Motor, you understand basic electrical circuits and chemical reactions. Time to start taking things apart.

Tinkerer — Brain Melt ⭐⭐

You own a screwdriver and you're not afraid to void a warranty.

Ready for Builder? You can identify components inside a dead appliance and you've made something that actually works. Time for the soldering iron.

Builder — Brain Melt ⭐⭐⭐

Time to break out the soldering iron and start salvaging parts from dead appliances.

Ready for Hacker? You can solder clean joints, read circuit diagrams, and you've salvaged your first MOT. Time to combine skills.

Hacker — Brain Melt ⭐⭐⭐⭐

You've bricked at least one Arduino. You own a multimeter and you actually use it.

Ready for Mad Scientist? You've built something that scared your neighbors. You understand high-voltage safety. Welcome to the deep end.

Mad Scientist — Brain Melt ⭐⭐⭐⭐⭐

You know what a flyback transformer is. You have opinions about capacitor brands. Welcome home.

Want structured learning paths? Check out the Skill Trees for step-by-step progression through Electrical, Pyro, Coding, Mechanical, Chemical, Optical, and Woodworking domains.

Crowd Favorites

#312 — Kinetic Sand Table Dead printers → never-repeating geometric art. Commercial: $1500. This: ~$80.	#033 — Musical Tesla Coil Lightning bolts that play music. Built from a dead TV and scrapped electronics.	#009 — Rubens' Tube Fire dances to music. Standing waves in a propane tube visualized by flames.
#333 — Ferrofluid Wall Alien liquid metal dances to music on your wall. Commercial: $3000+. This: ~$150.	#002 — Lichtenberg Wood Burner Lightning scar art burned into wood with a microwave transformer. Spicy ⭐⭐⭐⭐⭐.	#181 — Musical Marble Machine Marbles trigger tuned chimes as they roll through a hand-built mechanical instrument.

What's In Your Junk Pile?

Find builds based on what you already have lying around. One person's e-waste is another person's electron microscope.

Categories

🔥 Fire, Plasma & Chemistry — 64 builds

⚡ Electronics & Code — 45 builds

💡 Light, Sound & Visual — 43 builds

🔧 Machines & Mechanical — 53 builds

♻️ Salvage by Appliance — 72 builds

🎨 Art, Wearables & Fun — 50 builds

Reference & Safety

Contributing

Got a build idea? Found a mistake? Want to add safety info?

See CONTRIBUTING.md for the template, rating system, and submission process.

We're especially looking for:

• Builds from parts we haven't covered yet
• Better safety notes on existing builds
• Photos/videos of completed builds (link them in a PR!)
• Corrections to any ingredients or steps

Disclaimer

These builds involve electricity, fire, chemicals, high voltage, and mechanical hazards. You are responsible for your own safety. This repo is for educational and entertainment purposes. Always research thoroughly, wear appropriate PPE, and know your limits. Some builds may require permits or licenses in your jurisdiction.

The golden rule: If you're not sure, don't. No build is worth a trip to the ER.

_{Built from junk, powered by curiosity. Star the repo if you dig it.}