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1. Glue an 8", 1"-diameter PVC pipe into one end of a 45°-angle PVC pipe
   fitting, facing up. (See the upcoming Figure 12-13.)


2. Glue the other 45° PVC pipe fitting onto the other end of the PVC pipe,
   facing down. (See the upcoming Figure 12-13.)


3. Glue a 3", 1"-diameter PVC pipe into the open end of one of the 45°
   pipe fittings to form the coil end of the metal detector.


4. Glue a 6", 1" PVC pipe into the open end of the other 45° fitting.

This becomes the handle end of the metal detector.

5. Glue the 1" PVC cap on the open end of the 6" PVC pipe.


6. Drill a^3 ⁄ 8 " hole in the middle of the long section of PVC pipe on the
   side that will be to your left when you’re holding the metal detector.
   You use this hole to feed the wires from the microphone cartridge to the
   box containing your circuit. Note:If you’re left handed, consider placing
   this hole on the side that will be to your right when you’re holding the
   detector so that you hold the handle in your left hand and operate the
   switches with your right hand.

Figure 12-13 shows the PVC pipe and fittings made into a handle for the

metal detector.

Figure 12-13:
Metal
detector
handle.

Chapter 12: A Handy-Dandy Metal Detector 295