A metal detector's coil is the rounded coil of wire on the end of the metal detector. The coil is fed a signal of the electronics in the body of the detector and transmits to the area that surrounds it via an oscillating electromagnetic field. When the field comes into contact with a metal object, its shape is changed. This is detected by the coil, which sends a signal back to the electronics in the metal detector, causing a sound that notifies the user of the presence of metal.
Simple Metal detector on transistors
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How to make a DIY metal detector
make a DIY mini metal detector
How to make homemade metal detector
Homemade Metal Detector Without Radio
Homemade Metal Detector Simple & Sensitive
Things you need
1/2 inch thick block of wood
Pen
Compass
Bandsaw
0.25 thick insulated copper wire
Step 1
Draw a large circle on blocks of wood using pencil and compass. The size of the circle may vary, but the depth of penetration of the metal detector is proportional to the size of the detector coil; So greater that you can do it, the better. Draw a second circle inside the first circle, leaving a gap of between 2 and 3 inches between the circles.
Step 2
Place the piece of wood on the bandsaw. Carefully cut the outer circle of wood using the bandsaw. Select a location on the circle and cut a line through it to reach the inner circle. Cut out the inner circle of wood with the help of Bandsaw, which gives a round wooden shape with a small incision in it. Take the circle from the bandsaw and discard the excess wood.
Step 3
Wrap the copper wire tightly around the circle, starting on the outside and turning the cups so it passes through the hole in the middle and comes back on itself. Continue until you have wrapped the copper thread around the circumference of the circle, creating a circle of looped cups.
Tips
When element copper wire around the wooden block, be sure to leave between six inches and a foot copper wire loose at the start and end points of the loop, as these will connect to the circuitry of the detector. You can use less wire for these joints, but it would involve placing the detector equipment closer to the coil, which could cause interference.
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