Hot Hacks, Mods & Circuitry Posts

How To: Make a Spot Welder for Cheap!

A typical resistance spot welder can range in price from about $200-$800, but with a little resourcefulness and a bit of free time, you can make one like this for about $10 or less.

How To: DIY Stick Welder from Old Microwave Parts

Lurking inside your old junk microwave is an abundance of useful parts that can let you melt metal, spot weld, and make electrifying Jacob's ladders. You can even make a powerful AC arc welder, perfect for making hard-to-solve puzzles and even makeshift weapons for the zombie apocalypse.

How To: Make a PVC Hand Pump to Move Water, Compress Air, & Create Vacuum

When you're using vacuum power, moving water, or compressing air, it's more than likely being done with some sort of pump. I'll be needing a pump for some of my future projects, so in this tutorial, I'll be showing you how to make your own customizable PVC hand pump that will let you do all three.

How To: Build a mini hovercraft with household items

Learn how to build a mini hovercraft. With a few items found in almost any desk or tool drawer, you can make your very own mini hovercraft capable of gliding over any flat surface.

How To: Build a simple carboard magnet generator

Build this ultra-simple AC electric generator from magnets, wire, and cardboard. (And a big nail!) Light a small lightbulb, or flash a red LED.

How To: Mod Your Old iPod 30-Pin Dock into a Bluetooth Speaker for Your iPhone 5

If you bought the new iPhone 5, you've probably been less than thrilled with the lack of cases and accessories that you can use it with. Docks are no exception—users were disappointed to learn that Apple has no plans to even make one for the newest addition to the Apple family.

How To: Extract an RFID chip from a card & make it wearable

Here's how to remove the RFID chip and antenna from a London Oyster travelcard. You can then put it in anything you want. You need a jar and acetone.

How To: 10 Unique & Practical Ways to Repurpose Your Old Hard Disk Drives

At one point in the '90s, about fifty percent of the CDs produced worldwide had an AOL logo. About fifty percent of the CDs in my home still have that AOL promise of 500 free hours on them. Though they never got me to join their internet service, I did get a lifetime supply of coasters. Thanks to the rise of high-speed internet access and bigger and better hard drives, there's no reason for companies to snail mail any more of those obnoxious plastic discs.

How To: Fix Dead Lithium-Ion Batteries That Won't Hold a Charge Anymore

"What is dead may never die." That's easily one of the best lines (and episode title) from HBO's Game of Thrones series. While the saying may ring true for the Ironborn, it's not quite as catchy when it comes to batteries.

How To: Build a Leyden jar and use a capacitor

Simple yet effective, capacitors come in a dizzying array of forms and materials, vital to so many circuits for storage, timing, and filtration - the mighty capacitor!

How To: Turn a cheap MIDI keyboard into a custom audio control

Controllerism is a lot like turn table-ism, except through its exclusive use of controllers and music software. Take a look at this instructional video and learn how to turn a simple and inexpensive MIDI keyboard into a custom audio controller. First, you'll want to rearrange the keys to line up with the knobs. Then, cut up an old DVD case and a bicycle tube to glue the rubber onto the keys to make it more tactile. Lastly, you'll need to set up the software to assign the keys with controls on...

How To: Light a light bulb with a potato battery

Following on from Edison's first lightblub moment back in 1879, the OU's Stephen Serjeant experiments with an alternative power source - the humble potato. Create a potato batter with a couple of screws and a light bulb.

News: Mod a flashlight into an IR night vision light

Record stealthily, in the dark. This hack is simple and will turn any LED flashlight into an infrared night vision light you can use with any video camera.

How To: Make a satellite dish Wi-Fi antenna for free internet

Need internet but don't want to pay? Well, try lusting of those around you by picking up their Wi-Fi signal. Live out in the boondocks? No problem… if you have an old satellite dish laying around.

How To: Hack a coin operated laundry machine

Man, it's laundry day and once again you have NO quarters. Well, check out this video and you'll never need quarters again. This how-to shows how to pick the lock on a coin operated laundry machine and then rig it up so you'll never need to pay again. Sweeeet.

How To: Hack Software & Run a Trial Program Forever

With this video tutorial, you'll learn how to hack demo versions of applications such that they'll run indefinitely. You'll just need to modify the date and time on your computer. Learn how to use trials of programs without them ever expiring instead of buying the real thing with the hack outlined in this how-to video.

How To: Hack Your Old Computer Mouse into Retro Wireless Bluetooth Mouse!

Since most devices these days are mobile and wireless, a lot of people have a bunch of old hardware from a decade or two ago sitting around unused, just wasting away in dusty boxes. Look familiar?

How To: Hack Your Electricity Meter

This video will show you what you'll need to know to hack a digital electric meter. You'll need 2 magnets, one much bigger than the other, an AC adaptor that you'll cut into pieces, or some speaker wire, distilled water, electrical tape, a knife, some plastic wrap, and a plastic cup. Remember, this is illegal, and shown only for educational purposes.

How To: Convert Your Old Apple iMac G4 into a Cable-Ready HDTV

Most of us have traded our desktop systems for laptops, tablets, and mobile devices, meaning there's a lot of outdated hardware sitting in attics. Want to give your old computer a new purpose? Matthew Chappee turned his iMac G4 into an HDTV using the guide by Dremel Junkie. One thing to note before you take on this project yourself is that if you want to use it to watch cable, you'll need a converter box to get around the MPAA's HDCP restriction. But, a converter box is considerably less expe...

How To: Make a Super Cheap One-Way Check Valve

If you're going to build yourself a water gun to cool down this summer, or maybe just a useful water pump, you'll need some check valves. However, the most expensive parts of a water pump or DIY super soaker are usually the check valves. So, let's make some from scratch for as little as $0.35 each.

How To: Hack a Vending Machine in 3 Easy Steps

How to get a vending machine to pay you for its goodies, instead of you paying for them. First off, find a older vending machine, and insert your dollar bill as you normally would. Once you have entered it, you can select which ever item you want. Then quickly, before the item dispenses, hold up on the gate to prevent the item from falling. When it falls, it should rest on the back of the gate you're holding up—don't let go yet. After a long wait, the vending machine will think nothing dispen...

How To: Block RFID Signals, Build an RFID Reader Detector, and Make Custom RFID Tags

RFID chips are everywhere. They're in passports, credit cards, and tons of items you've bought in the last 5 years or so. Big retailers like Walmart started using tracking products with RFID as early as 2004, and today, they're used in everything from mobile payments to hospital record systems. Chances are, unless you're a hermit (in which case you wouldn't be reading this anyway), there's an RFID tag within a few feet of you. Photo by sridgway

How To: Make a DIY vehicle immobilizer to stop car thieves

We all know the G-spot as that sensitive area that drives women crazy, but for auto enthusiasts, it has a whole new meaning. The G-Spot, designed by Daniel Davies, is a vehicle immobilizer, which keeps your vehicles safe from car thieves. And you don't need to pay a huge amount of money to get one, either! You can make on yourself, right at home, provided you have all the right materials.

How To: Hack a local wifi internet connection with your PSP

Play remotely with all your friends, stream videos and music from the Internet or even check your Facebook and email - all with your PSP. The PSP has Internet capability, but not every network will be available to you at all times. Here is how you can hack any wifi connection with your PSP.

How To: Hack Christmas Lights for Custom Holiday Lighting Patterns

General Electric isn't known for their Christmas lights, but maybe they should be, because their GE Color Effects are pretty awesome. Especially the LED Color Effects G-35 String sets. And especially when someone named Darco hacks them.

How To: Use perfboard prototyping for your electronics projects

Perfboard, or perforated board, is a simple board with evenly spaced holes and lined with metal which can be soldered on one side. The holes let you set up a board with circuits and wires as you need them for your own project. This tutorial shows you everything you need to know to build electronics on your own perfboard.

How To: Make a working wire tracer with spare parts

You probably won't be using a wire tracer very often, but if you do need it for some reason - save the money and make your own! This tracer is made solely out of spare parts that you probably already have in your garage or basement. So, follow along and get started.

How To: Build a hover craft

This is a Wired Magazine Geek Dad production. Make your own UFO at home with this hover craft. You need a leaf blower and some ingenuity. Build a hover craft.

How To: Take apart an Etch a Sketch

Before I built the mechanics for my laser cutter I was planning on using the etch a sketch since the pulleys where already there. I accidentally cut the wires while taking it apart, so I made it from scratch (much bigger too). But I figured I'd post this in case you want a small laser cutter and need to learn how to take apart an etch a sketch. It was a bit tricky. The tought part was trying to take off the case. What you need to do is to pry the red off of the black, not the other way around.

How To: Hack a satellite dish into a WiFi signal booster

There are many ways to recycle a satellite dish and this is one of them. In this video tutorial, you'll learn how to hack an old satellite dish into a biquad WiFi antenna. For detailed, step-by-step instructions on building your own audio signal booster, take a look!

How To: Quick-N-Dirty Circuit Board Repair: How to Patch Faded or Corroded Traces with Pencil Lead

You may already know that you can build a functional circuit on a sheet of paper with the graphite from a pencil, but you'd probably never think of using it to fix an electronic device. This same principle can be used to bring back a bricked phone, but can also repair a damaged or corroded trace in a printed circuit board. Redditor 404ClueNotFound spilled water on his favorite computer keyboard (like so many of us have done before). The damage was minimal, but after drying it out, one key sti...

News: Infrared LEDs Protect Your License Plate Number from Police Cams

Got a knack for speeding? Like running red lights? Believe or not, the police have better things to be doing than pulling you over, like catching real criminals. That's why more and more cameras are popping up at known speeding zones and on street corners—so the cops can clean up the streets, compared to just ticketing them.

How To: Build a Deadly Motion-Activated Airsoft Turret Gun

It's tough out there on the battlefield, especially when your stuck in the trenches and your comrades are dropping like flies. There's no hope. At least, until the next airsoft battle.

How To: Build a Remote-Controlled Water Gun (Or Flamethrower!)

You can do a lot with water guns. Have trouble waking up? Make a water gun alarm clock that (almost) no one could sleep through. Prefer real ammo? Turn your water gun into an airsoft BB gun. And if you don't have one, you can even make your own.

How To: Lock and Unlock a Safe

This is an easy step by step tutorial how to lock your jewels in a hotel room or in a public safe. Be aware that in a public safe it is more secure to use the second method of locking by a magnetic card, not by a PIN code that can be easily seen by someone nearby.

How To: Make a Super Secret Batman-Style Bust Switch for Your Batcave (Or Just Your Lights)

Remember the 1960's American television series Batman, with Adam West as Bruce Wayne? It was waaaaay before my time. The caped crusader that I'm more familiar with is actually this one... When I first heard of Adam West, it was him doing the Batusi on The Simpsons. I had no idea what was going on, so I looked up Adam West and his sensual dance and found myself face to face with the 1960's Batman.

How To: Make a Powerful Handheld Rocket Launcher from PVC and Sprinkler Parts

Take everyday sprinkler parts and form them into a high pressure rocket launcher that will shoot paper rockets nearly 300 feet!!! It's cheap to make and a lot of fun!

How To: Circuit hack and mod

In this video, we explain some techniques for getting electronic circuits to do things they weren't designed for. As an example, use a speaker phone as a speaker. Hacking items into better or different devices is way cool DIY circuitry. These are ideas of electronics that are cool to splice, rip apart and use recycled electronics for new projects.

How To: Scramble 4 Eggs Inside Their Shell at Once

Video: . Using this method is stupidly simple.

How To: Hack a 20-Year-Old "Brick" Phone into a Digital Cell You Can Text On

The cell phone has come a long way. The very first "mobile devices" were made and used by the military in the late 1930s, with the first commercial mobile telephone service introduced by Bell in 1946. These devices were hardly what we'd call mobile today—some took up the whole trunk of a car, and others had to be carried on your back in a heavy bag.