Introduction: Paper Circuits - LED Name Tag
Impress your friends, dazzle your colleagues and impress the unimpressable. A simple led circuit will bright up a normal boring name tag. This will demonstrate how to make a simple LED circuit powered by a by a button battery that is so simple to make you could build it before your next conference's welcome speech.
Step 1: Materials
What you need:
- Conductive tape - any metal tape will do. I used foil duct tape but copper slug tape will work as well.
- Button battery - must be strong enough to light the LED, I used a 3V watch battery
Step 2: Build the Circuit
Write your name on the name tag.
Poke the legs to the LED through the paper, making sure they don't touch each other.
Cut some strips of conductive tape. Using the tape, stick down the legs of the led and make a tape 'wire' that extends to one of the corners of the name tag. This is where the battery will be locate.
****Most of the tapes I've used will not conduct on the sticky side. This means you need to be creative wrapping the corners over one themselves or pulling of the sticky to complete the cicuit.
Step 3: Light It Up
When you are done you should have a loop of tape wire with a space missing for the batter. We are going to fold over the corner of the name tag to make a switch to turn on and off the led.
Clip the battery in place with the paperclip. When the battery is in place it completes the circuit and light up the name tag. If the light doesn't come on try reversing the battery. Remember LEDs only work one way.
Now you are ready to blow some minds.
One final note: If you plan on wearing your name tag for an extended period of time. You may want to add a small resistor to the circuit. LEDs have a nasty habit of eating up all the current they can and will burn themselves out if there is no resistance in in the circuit.