I do believe, that before you start working on metal detector you should read more about metal detectors and how they work.
I am not hold responsible for any damage that occurred during reproduction.
Step 1: Parts and materials
- 47 kΩ resistor
- two 2μ2 F capacitor
- 9 V battery, switch, battery cable and some wires
- 100 m of copper wire, 0,2 mm in diameter
- gaffer tape and wood glue
Instead of buzzer you can use 10 μF capacitor and speaker (8 Ω impendence).
- breadboard and wires
- pliers, tweezers, pliers for making holes
- soldering iron and soldering wire
- sharp knife, ruler, pencil and pair of compasses
- hot glue
Step 2: Schematics
Step 3: Coil
I made coils core from cardboard. Coil is made from lacquered copper wire which is 0,2 mm in diameter. I did 260 turns. Before soldering, you must clean up both ends of coil. You can do that with help of sandpaper.
Step 4: Testing
Step 5: PCB
Step 6: Cardboard structure
First, I made a sketch. There were no measurements. First I made three pieces that will end up a handle. Second task was to cut out openings for batteries and for switch. Then I glued handle together will wood glue and left it to dry for 12 hours (through the night). When glue has dried I punched a hole into section where switch will be. That hole is for wires to get through.
Last but not list thing to do was to glue coil to the handle. I have done that with help of hot glue.
Step 7: Put it together
Step 8: Conclusion
This detector is really very simple one. But I must make a note that it is not meant for serious work. When I tested it outside, it didn't work propperly. But it is a simple and fun project for beginers. I must say I had a great time making it and using it!
I wish you good luck with making this metal detector and have fun while using it.