METAL DETECTOR (Soldering) DIY Kits

Soldering Involved

This circuit most useful for security checking Metal Detector available in the market are quite expensive

This metal detector can be used to detect slightly big size metallic objects tune sensing Coil This Col should be kept near metallic objects for defection. The input of Circuit is s wenk Colpitts R.F. range Oscillator. Sensing coll forms parts of tuned Oscillator

When the coil is brought near a metallic object magnetic energy is absorbed and Oscillator tails to work. Then tinal transistor conducts and the buzzer is activator Use a9 volts battery Alter connecting battery, adjust the 4.7K preset till circuit st loop Sounding

COIL
RF SECTION
RF AMP
PIEZO ALARM

Requirements :
● Soldering Iron with Soldering station.

Components

PARTS LIST :
RESISTORS

RI.R4. – 56K

R2 – 3K3

R3 – 22K

R5 – 2K7

R6 – 2K2

R7. R9 – 680E

R8 – 15K

P1 – 3386 Trim.

CAPACITORS

CI. – IPF (104)100KPF

C2 – IKPF 102).001PH

C3 – 220PF

C4 – 270PF

C5 – 13 KPF 100V

C6 – 0.012/100V)

C7 – 100/25V

TRANSISTORS

Q1.234 – BC547 PH

DIODE DI.2.3,4 – IN 4148

MISCELLANEOUS

LED 1 – 5MM Red Led

Coil l- Metal Detector Coil

Buzzer – VK 27 CT(S)

Supply – 9V Snaper

PCB

1 nos

Hardware

Getting
Started with
soldering and kit

How Does a Metal Detector Work?

The metal detector working is, when the electromagnetic field is transmitted from the search coil into the earth. Metals in the electromagnetic field will become strengthened & resend an electromagnetic of their own. The metal detector comprises of a search coil which receives the retransmitted field & alarms the user by generating a response of the metal. Superkits metal detectors are accomplished by discriminating between dissimilar types of targets and can be fixed to ignore unwanted metal objects.

Search Coil

The electromagnetic field can be transferred by the search coil of the detector into the ground & receives the electromagnetic field return from a metal object.

Electromagnetic Field Transmission

The transmitted electromagnetic field energizes metal objects to allow them to be sensed.

Target

Here, a target is a metal object that can be sensed by a metal detector. In this, the target is treasure which is sensed and that is a good target.

Undesirable Target

These metal objects are generally attracted to a magnet like nails and also non-ferrous like bottle tops. If the metal detector is fixed to discard unwanted targets, then the response of the target will not be generated for those targets.

Receive Electromagnetic Field

The receive electromagnetic field is produced from energized targets & it is received by the search coil

Response of the Target

When the metal detector detects the metal object, then it generates an audible sound like a beep.