Intro: Electromagnetic Pen
This pen-like object turns into a magnet, an electromagnet. How it all works: When a DC power supply goes through a coil of magnet wire, some of the energy is stored around the coil in a field. Introducing my first instructable: Electromagnetic Pen!
(Doesn't actually write. Just looks close to a pen) You don't have to use battery holder, you can use a bench-top power supply!
http://www.youtube.com/watch?v=AERfL4Q5JJo < around ten second video!
Helping Hands (optional)
If I use some tools not listed. I will post.
Magnet wire (a lot)
Steel rod (Mine is a 6 inch steel rod) Better if you use iron.
Heat shrink (just a little bit shorter than steel rod. The rod should slide through the heat shrink easily)
Small push button (momentary- Completes circuit when pressed)
Battery holder (doesn't matter size. Just don't use a 9v or it will get too hot. Or use a desktop power supply)
Step 2: Wrapping Magnet Wire
Wrap magnet wire around a lot until you are close to the edge of steel. Make sure there is bare steel on one end. Tape with electrical wire and leave some out around 5 inches.
Step 3: Center Heat Shrink...
Center heat shrink next to the steel bar so that steel bar is barely sticking out.
Step 4: Place the Switch
Find a spot for switch. You need it to be close to your finger. You hold it like a normal pen. Make a small hole for switch wires in the heat shrink. (You don't even have to put on a switch on the pen.)
Step 5: Make a Hole for Switch Wires...
If you think it will short out, put heat shrink tubing around solder joints. Find the end with the steel that is poking out the farthest (this is the part of magnetic side on right) Solder an extra length of wire to opposite side with the bare steel side. Make sure the wire sticks out, an inch or so, farther than steel. Do same with other wires. (I'm trying my best to say this clearly. Sorry)
Step 6: My Switch Idea.
Not good. But it will work. If you find or know of a better spot for switch. Go ahead and place it where ever.
(You don't even have to put on a switch on the pen.)
Step 7: Almost Done!
At the end (top of pen) there should be four wires. Hopefully you took note on which is which. Hook up one wire from magnet wire to one wire from switch wire. Hook the other end of magnet wire to one terminal of your DC power source. Hook up the switch and other battery terminal together. (You don't even have to put on a switch on the pen.)
Step 8: DC
I use a battery that is charged by a solar panel connected by a wire from battery to pen.