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Engineering Projects

Published on Feb 15, 2016

Abstract

The aim of this project is to construct our own metal detector. It is used to hunt hidden treasures such as metal coins, iron ore, aluminium or even silver and gold buried under the earth.

The instrument can be used by hobbyists and treasure hunters alike. It can also be used to detect buried cables and concealed wiring.

Switch on the device and place a metallic object near the search coil. Adjust the 2J gang condenser till beat note is heard loud and clear through the headphone. The beat can also be heard through a MW receiver placed near the metal detector.

This metal detector is able to locate metal buried up to 30 cm in earth provided it is there in abundance

Search Coil

The search coil comprises 26 turns of wire, center tapped. Gauge of the wire can be anywhere from 24 swg to 36 swg.

To build the search coil, two 15 cm long and 2.5 cm thick wooden pieces are required. Slots should be made edges of these pieces and these may be joined together in the shape of a cross with a screw as shown below.

For handling convenience, this coil may be fixed at the end of another reefer, whose length is approximately equal to that of a walking stick.

Switch on and place a metallic object near the search coil. Adjust the 2J gang condenser till beat note is heard loud and clear through the headphone. The beat can also be heard through a MW receiver placed near the metal detector.

This metal detector is able to locate metal buried up to 30 cm in earth provided it is there in abundance