### DESCRIPTION

A metal detector is an electronic instrument which detects the presence of metal nearby. Metal detectors are useful for finding metal inclusions hidden within objects, or metal objects buried underground. They often consist of a handheld unit with a sensor probe which can be swept over the ground or other objects. If the sensor comes near a piece of metal this is indicated by a changing tone in earphones,  Usually the device gives some indication of distance; the closer the metal is, the higher the tone in the earphone 

### TECHNICAL DETAILS / COMPONENTS

 downlodad  Circuit diagram | http://bit.ly/2GoRaJ5

### LEARN / TOPIC / BUILD INSTRUCTIONS

 downlodad  Circuit diagram | http://bit.ly/2GoRaJ5