The first Photo shows a finished Search Coil with 8 coils and 16 labeled wires extending down the center of the Coil Assembly. This may look daunting however is quite simple as I have provided a template and a method to easily construct.

The first coil is located at the end of the Coil Assembly so that you can pinpoint the target more easily. There are three separate pairs of coils on the side of the Coil Assembly.

1. Prepare the Coil Assembly

Cut a 15cm length of 20mm Electrical Conduit Pipe. Download the template provided, print out on A4 paper and then cut out and glue to the outside of the pipe. Take care to ensure the arrow is at one extreme end of the pipe.

2. Drill the Holes

Use a 2mm drill bit to drill the 16 holes marked on the template for holding the Coils in place. The diameter of these holes should be just big enough to hold a Bamboo Kebab Skewer as per the photos.

3. Channel 1 Search Coil

The first pair of search coils is located at the end of the Coil Assembly so that you can pinpoint the target more easily. This consists of an Outer and Inner coil as per the photo. The inner coil is 12mm diameter wound with 20 turns of copper wire. This is glued into place with hot glue. The two wires are passed down the tube with an additional 10cm length extending past the end of the tube. MAKE SURE YOU LABEL THE ENDS OF THE COILS SO THEY CAN BE IDENTIFIED EASILY WHEN CONNECTING UP TO CIRCUIT BOARD.

The Outer Coil is simply wound around the end of the 20mm Conduit with 20 turns of copper wire and the ends passed through the hole marked on the template.

4. Channel 2-4 Search Coil

The next 3 coils are located on the side of the Coil Assembly. Use 4 Bamboo Kebab Skewers to provide a stable point to wind the coils in place until they are glued and labeled. These are clearly marked on the template and are wound with 20 turns of copper wire then glued into place with hot glue.

Start with the inner coil first so that it won't interfere with the winding process when you come to the next coil.

The two wires are passed down the tube with an additional 10cm length extending past the end of the tube. MAKE SURE YOU LABEL THE ENDS OF THE COILS SO THEY CAN BE IDENTIFIED EASILY WHEN CONNECTING UP TO CIRCUIT BOARD.