Introduction: Faraday Sleeve

About: Hey all, I'm new to this hobby thing. I enjoy making many different things, right now my interests are in woodworking and CNC. I would like to get better with CAD and learn laser operations and 3D printing.

Hey folks, this instructable will walk you through my way of creating a Faraday sleeve. Faraday cages/bags/sleeves are used to protect sensitive electronic equipment from external radio frequency interference and are also used to enclose devices that produce interference to prevent interfering with other close equipment. I was able to validate this sleeve blocks cell phone signals. I hope you are able to build yours as easily as I was. Thank you and have a great day.

Step 1: Your Materials

The materials I used were: Reynolds Wrap heavy duty aluminium foil, Duck Tape duct tape, 2 pencils, a rubber band and the tools were a tape measure, a marker, and a single edge razor blade.

The Reynolds Wrap was a 12x24 inch piece and the Duck Tape was approximately 5ft in length.

The reasons I chose these materials are that all/many houses have them and if not they are cheap and can be purchased at any grocery store or drug store and most gas stations.

Step 2: Folding

I began by folding the foil in half so I now had a 12x12 size, put a crease in this fold. In the picture I folded the paper right to left.

For the next fold I rotated the foil so the opening is away from me and again folded it from right to left. I did not crease this fold.

I rotated the foil so that the opening is facing me and took a marker and drew a line on where I was going to fold the foil over itself. I first folded it down the long edge then I folded it across the short/bottom edge.

The goal during this phase was to ensure I did not rip the foil and at all points there is at least a double layer of foil.

Step 3: Tape the Seams

I taped the short/bottom seam first, by lining the seam across the tape at its halfway point/ width. Once it is in position, fold the tape down onto the other side of the seam. I ran a little long on the tape for this one and cleaned it up with the razor. Whenever tape is doubled down it can be rough to tear and it is important in this build not to tear the foil.

I next laid out a strip of tape that would run the length of the long edge. This strip is to hold down the two sides but not the seam. I took another piece of tape about the same size as the long edge and made the seam "cut" the tape in half and folded it over the top of the seam securing the long side.

Step 4: Tape the Outside of the Sleeve

Start the tapping of the outside of the sleeve by beginning at the top/opening and running the tape to the bottom. When at the bottom, flip the sleeve and bring the tape to the top and cut it. Continue this process until the entire sleeve is covered in tape.

Of note, it is not the tape that will block the signal. That is all done by the foil. The purpose of the tape is to ensure that all seams are closed and provide some support to the foil and prevent rips.

Step 5: Tape the Inside of the Mouth

I started by wrapping the back side of the tape around the mouth of the sleeve and cut it, and then I cut it in half.

I took one piece and placed it inside to the half way point and applying it. I then folded it over to close off the seam.

I repeated the process to the other side, with the little run over I cut a slit to allow easier closing.

Step 6: All Taped Up and Ready to Roll Up

At this stage the sleeve is all taped up on the outside and about an inch inside the mouth.

The next step is to place a device that I want to protect in the sleeve. To enclose the device I place a pencil towards the top and fold the top over it once. With a fold over the pencil I do it again and place a second pencil on top of bag and secure it with a rubber band that runs on the opposite side of the sleeve. With a device in the bag, the bag closed, folded, and secured I called the device and it did not ring or receive the call thus validating the construction.

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