Electronics

  • How to Build a Model Roller Coaster
    Building a model roller coaster is a great, hands-on way to learn about physics and centrifugal force Whether you plan to build a roller coaster for fun or for learning, you ...
  • How to Extract the Gold From Computer Circuit Boards
    Computers and other electronic devices contain gold and other precious metals in their circuit boards As consumers upgrade their electronic gadgets, the precious metals ...
  • How to Wire a 24 Volt Trolling Motor
    One of the best upgrades to small fishing boats is replacing the 12-volt trolling motor with a more powerful 24-volt model In addition to producing more thrust, this upgrade ...
  • How to Make a Lemon-Powered Light Bulb
    A lemon-powered light bulb is a great science project or even a great green solution for camping or power outages The acid in a lemon causes a chemical reaction when metals ...
  • How to Fix Fiber Optic Lighting
    An optical fiber is a strand of pure glass which has a hollow reflective core Optical fibers are used in many places, but you are likely to be more familiar with their use as ...
  • How to Measure UHF Antenna Resistance
    The easiest and most accurate method of measuring the resistance of a UHF antenna is to use a digital multimeter Measuring the resistance gives you the level that the ...
  • Different Types of Weather Instruments
    Weather watching is a fun hobby and can lead to an understanding of the triggers of and precursors to severe weather From basic measurements of temperature, humidity, air ...
  • How to Polish Rocks With a Dremel Drill
    Rock polishing machines are noisy and tumble rocks together to create a smooth and shiny surface You can create similar results without this machine. A Dremel tool with a ...
  • How to make a Viking shield
    Step by step instructions for making an authentic Viking shield Viking were ruthless marauders that needed a proper shield for protection! learn how to make an authentic ...
  • How to Charge 12V Batteries in Parallel
    Batteries may be wired in parallel or in series Two 12-volt batteries wired in parallel continue to produce 12 volts, but the capacity doubles. Two 12-volt batteries wired in ...
  • How to Build Tattoo Machine Coils
    Wrapped coils, made from insulated copper wire and iron, are the electromagnetic backbone of any tattoo gun The coils come in three different sizes, 8, 10 and 12, which ...
  • How to Restore Dead 6 Volt Golf Cart Batteries
    Golf-cart batteries are similar in design to car batteries, but are called deep-cycle lead-acid batteries Batteries used in golf carts need to produce constant voltage and ...
  • How to Calculate the Scale of Models
    A model's scale describes its size in relation to its real-life subject and takes the ratio form 1:[number] The first number of the ratio is always "1." The second ...
  • How to Connect the Wires to the Transformer of a Toy Train
    The majority of toy trains run on low voltage DC (direct current), which is different from the AC (alternating current) running through your home's power outlets Because of ...
  • How to Test a Bridge Rectifier
    Bridge rectifiers are used to convert AC power from the wall outlet into DC power; rectifiers are common in consumer electronics that require DC power Internally, a bridge ...
  • Instructions for Cobra Walkie Talkies
    The portable, handheld, two-way radio is a communication device that works by sending and receiving messages with another radio on the same frequency The two-way radio is ...
  • How to Test a Varistor
    A varistor is an electronic component that protects expensive devices from harmful power surges, much like a shock absorber For example if there is a power surge, the ...
  • How Do Bumper Cars Work?
    Bumper cars rely on electricity to run, which may be pulled from an overhead power supply or from built-in, rechargeable gel cell batteries In an overhead power ...
  • How to Wire an Old Lionel Train Set
    Hobbyists and model railroad fans have been collecting and "playing" with Lionel trains since 1900 All electric train layouts require attachment to a power source ...
  • How to Build Train Table
    The first mass-produced model train was made by Marklin in 1891 and since that time the hobby has grown to include millions of fans, including musicians Rod Stewart and Neil ...
  • How to Troubleshoot an Electric Train Set
    It's great to see your model trains running around the track, but if they suddenly stop, tip over or can't get started, you will have to troubleshoot the problem Electrical ...
  • How to Replace an Invicta Watch Battery Without a Tool
    Replacing an Invicta watch battery without the proper tools can be performed, but it can be difficult if the screwdown case back is too stubborn to unscrew Replacing the ...
  • How to Troubleshoot a Boat Tachometer
    A boat owner running a boat without a tachometer handicaps himself significantly This small instrument dial, which details the revolutions per minute of the engine's ...
  • How to Make Battery Powered LED Lights
    Light emitting diodes (LEDs) produce a subtle lighting effect They use very little energy and operate under low voltage power, so a battery is an effective means of powering ...
  • How to Make Our Own Smoke Oil for Model Trains
    Model train collectors strive to make their model train sets look as realistic as possible by painting them the colors of real-life trains, adding different cars to their ...
  • How to Make a Toy Train Track Suspended From a Ceiling
    Many toy train collectors and model railroad enthusiasts lack the space needed in a basement or garage to build a permanent layout for running their trains Even a compact, ...
  • How to Calculate the Pulley & Belt Ratio
    Pulley and belt systems are one of the easiest ways to change speed and torque in a system If a small pulley is connected to a large pulley and the small pulley is the ...
  • How to Display Model Airplanes From Your Ceiling
    After the time and patience that goes into building a model airplane, you'll want to display the work so others can see it This is simple when the model is a car or other ...
  • How to Tune a CB Antenna Without an SWR Meter
    In 1958, the Federal Communications Commission allocated a block of frequencies in the High Frequency range for Citizens Band (CB) radio The commercial equipment available ...
  • How to Make a Homemade Plasma Cutter Using an Arc Welder
    Plasma cutters are becoming the tool of choice for cutting metal They're quick, clean and easy, requiring less skill to operate than an oxyacetylene torch. However, if you ...