The look of electronic circuits and PCB has grown more and more popular in the last few years. People like to looks of integrated circuit chips and resistors, these define electronics for the less knowledgeable in the field of circuitry. This bracelet takes a cheap price, a cool result, something to show to your friends, and satisfaction that you can make something this cool and puts in one awesome bracelet. This is a great way to get started in soldering in this configuration (without PCB). There is a fair amount of soldering in this project but, most of it is pretty easy to do. There are 12 components needed and a few common tools that almost everyone has, needed in this project.

If you believe that this is cool and think it should win some contests, please vote for the contests that it is in! Thank You!
I have chosen the contest to enter this in because I could use the prizes.
Epilogue 16 laser challenge- I entered this contest because I could use the laser to cut wood or other materials to make models and RC planes. (I will make Instructables for these so vote for me!)

Pocket sized electronics- If I win this contests I would use the Cameo to cut stencils and start a custom stencil business on eBay! and I would also use it to precisely cut card stock for making well, everything I could think of!

Kit Contest- This one i am really exited about! A notebook, a tablet, and the really cool and awesome AR drone. Ever since the AR drone 2.0 came out i have always wanted one! I plan to use the Asus for putting all my cad software on. I would use the tablet to control the AR drone and to check instructables for all the cool things people create!

Step 1: Choose a Circuit...

There is a very large variety of circuits that can be compacted to fit in a bracelet like this. I used a 555 timer to make a blinking light for this instructable because it is very simple and a good way to impress your friends (and it looks pretty cool too), you can put anything you want in it from a TV be gone and a TV remote jammer, to a stun gun, into a bracelet like this.
Simple Circuits
• Micro-TV-be-Gone- You can go a round messing with people when you are armed with one of these!
• TV-Remote-Jammer- Very fun to use!
• Stun-Gun- Would be tricky to fit in a bracelet.
• Many more circuits can be found here.
I think the flashing light is a great beginner circuit because it is simple to assemble, will run for a long time, and is awesome because blinking lights are cool!

Step 2: Materials and Tools...

The tools and materials used in this project are very common and pretty cheap to come by. The links by the electronic components will help you to get some for you if you do not have the required pieces.
Materials
1) Clear Tape- Office Depot/ Wal-mart
2) Solder- Radio Shack/electronic online store
3) Wire (color of your choice)-Radio Shack/Home Depot
4) Super Glue- Office Depot/ Staples
5) Velcro (both sides) Hobby Lobby
6) Heat Shrink Tubing- purchase from Mouser Electronics
7) 555 Timer IC- purchase from Mouser Electronics
8) 6 pin surface mount switch- purchase from Mouser Electronics
9) Four 3v,coin cell batteries- purchase from Mouser Electronics
10) 10uF capacitor- purchase from Mouser Electronics
11)Two LED's, the smaller the better. Mine are 3mm- purchase Red, purchase Yellow (from Mouser Electronics)
12) Two 470 ohm resistors- purchase from Mouser Electronics
13) One 47k resistor- purchase from Mouser Electronics

Step 3: Make a Bracelet Template...

Ok, so after you select your circuit and you have gathered up all of your tools, it is time to get started. To make the bracelet, you are going to have to make sure it all fits in the bracelet. To do this we are going to make a bracelet template. To make your template you are going to want to get a flexible tape measure (a sewing tape measures work great), hold the end on the top of your wrist and wrap it around until the end meets another piece of the tape measure. Record the measurement.
To draw the template, you need to get a ruler and measure out the length that you measured. Draw this horizontally on your piece of paper, after that draw another line of the same length about one inch above the other one. Now connect the two lines. Connect the two small lines with another of the length you measured.
Great the template is done time to work on the next step!

Step 4: Lay Out Circuit According to the Template...

Place all the stuff that is going to be contained in your bracelet in the general area that you want it. It all needs to fit pretty well. Some adjustments are possible, but not all. I chose to put the batteries near the ends and the circuit in the middle. If you are not using this circuit, make sure all the components will fit and that it will be able to move and bend.

Step 5: Circuit...

The circuit building is obviously the hardest thing to complete in this project, so let's get it knocked out!

Step 6: Change the Shape of Your 555 Timer IC...

1. Change the shape of your 555 timer IC- Take a pair of pliers that can grab onto all the pins on one side at the same time. Bend the pins so that they are horizontal. Repeat this step on the other side of the timer.

Step 7: Solder the Capacitor...

2. Solder 10 uF capacitor- Solder the positive lead of the capacitor to pin two and the negative to pin one as shown in the picture.

Step 8: Solder the LEDs

3. Solder Led to resistors- solder the two 470 ohm resistors to the positive leads of both LEDs.

Step 9: Shaping Your Sections...

4. Shaping and Heat Shrink application- Bend components into the desired shape to fit into your bracelet. Shape the 47 K resistor as shown in the picture. Place a small amount of heat shrink to the LED and resistor combinations as shown. Solder the lead from the resistor (negative) to pin 3 and the lead from the LED (positive) to pin 4.

Step 10: Solder 470 Ohm Resistor...

6. Solder the 470 ohm resistor to pin 3 I soldered it to the lead of the resistor to save space. Simple as that!

Step 11: Finish Soldering 470 Ohm Resistor...

7. Solder the other lead from the resistor to pin 6 of the 555 timer IC. Solder the positive lead (LED) to pin 1 of the IC and solder the resistor to (negative) to pin 3 witch I connected to the red LED's resistor. The current from the yellow LED should not go through the red LED's resistor.

Step 12: Create a Jumper...

8. Make a jumper using a cut lead from a component or you can use a piece of insulated wire. If you are using wire than skip this step, with the lead that you trimmed off another component, place a few millimeters of heat shrink over the wire then shrink it. Solder one side to pin 2, the heat shrink should be over pin 1. Solder the other end right behind the resistor.

Step 13: Create Another Jumper...

9. Create another jumper with another piece of wire or component clipping. Solder it from pin 4 on the end of the LED lead that I left there. Solder the other end to pin 8. Heat shrink should not be necessary. Pin 5 will not have anything soldered to it.

Step 14: Create Battery Connection Leads...

10. I did turn the circuit around!Make two curly q's with wire and leave a little bit of extra wire for soldering. Solder one of the curly q's to pin three of the switch, then solder pin one of the switch so that it connects with pin 4 of the 555. Solder the second curly q to pin one on the 555. Finally the circuit is done!

Step 15: Test Circuit...

Hook up your circuit to a 9v. Connect the right leads with alligator clips. Switch it on... If it worked there should be blinking light rather rapidly. do not worry about the speed the battery is huge so it is pumping a lot of current through it, the batteries in the bracelet are smaller. Do Not Leave Your Circuit On This Battery For Very Long! It Will Ruin It. Just test it, make sure everything works and take it off. You are so close to finishing you awesome bracelet. By now you have built something quite amazing.
After you test the circuit with the 9v, we need to hook it up to the batteries that it will be running on (the four 3v coin cells). To wire it up we will need to make three jumpers. We need two that span from the first battery on side of the circuit, to the other battery on that same side, we will call these "A." We also need another jumper that spans the two batteries that are farthest away from each other "B". To make these jumpers, take the wire measure the distance of the two batteries. Cut about two inches extra, strip about one inch from each end. Curl it into a swirly as shown. It's that easy! Now set up your circuit as shown below and get ready to make a bracelet. The picture second picture shown, shows you how to do this. Make sure it is oriented as shown.

Step 16: Position Circuit on Tape...

Take a piece of tape long enough to cover your entire template. Lay it down with the sticky side up. Position your electronics down like you did in the previous step.
Make sure that your circuit is oriented the same way as mine is in the picture. This is very important!
If your orientation is the same as mine then place you items on the tape in this order:
1. Circuit “board” (for lack of a better term)--center
2. Positive side down battery shown on the left-- left side
3. Negative side down battery shown on the right-- right side
4. Longest jumper wire “B” make sure to place leads where the batteries will be-- bottom of the picture spans the length of the bracelet.
5. Positive side down battery on left-- Left side
6. Negative side down battery on right-- Right Side
7. Small jumper over batteries on left-- Left side
8. Small jumper over batteries on right-- Right side
Now you should have your circuit laid out on the first piece of tape. Cut the tape according to your template. You should now have a piece of tape that is the exact size as the template with a circuit "board" that fits perfectly on it.

Step 17: Put on the Top Piece and Cut It...

Cut another piece of tape that has extra overhang over the first piece of tape. 1/4 of an inch is a fine overhang. Now, as carefully as you can line it up with the overhang lined up to the best of your ability. Once you have positioned it set it down with extreme care. Once it is resting on the circuit slowly press it down while trying to create a minimal number of air bubbles. Press the tape down all around the edges to seal up the bracelet.
Fold the 1/4 inch overhang under the first piece of tape. Now we have a sealed up circuit bracelet!
Cut a slot with the razor blade where the switch is. Also cut two holes where the LED's are.

Step 18: Test the Fit of Your Nerdy Bracelet...

After you have sealed it up around your wrist, you will need to make sure it is about the right size, if there is a little bit of overhang that is great! (half of an inch) If there is a lot extra, than cut it to one half inch extra. Your bracelet has been successfully sized!

Step 19: Attach Velcro Buckle (strip of Velcro)...

This is a very cheap method of connection; alternate methods will be listed in the next step. Stick one inch of spiky Velcro on the top of the bracelet. Super glue works great for this. Then put one inch of soft Velcro on the opposite side of the previous one placed. One piece of Velcro should be on the top and one should be on the bottom. Now you have a simple and adjustable method of holding your bracelet together.

Step 20: Final Thoughts and Modifications

There are many other things that you could do to change up this idea. Some that I came up with are easily feasible and some would just make it cooler.
Lamination- I think that it would be awesome to hard laminate it instead of using tape, I used ape because it is cheaper than laminating it.

Buckles- This one I did end up doing, I replaced the Velcro with a bracelet clip. Here is what I did: I took the extra slack in the two straps and wrapped them around the loops where the webbing or paracord would be. I then wrapped a thin strip of tape around the u shaped pieces of tape to secure it.

Circuits- Obviously you could do a lot more things than a circuit that makes lights blink. Use your imagination, anything that you can fit in a bracelet is fair game! The possibilities are endless.

If you build one of these be sure to comment and post a picture, especially if you make a different circuit. I want to see what you guys can create!