DIY metal detector kit assembly | Step by step instructions

 DIY metal detector kit assembly

    Hello guys, welcome back. Today we are going to talk about a DIY Metal detector kit assembly step by step. We can buy this metal detector kit at the lowest price in the market. Also, programming knowledge is not required to implement this metal detector kit. Through this, we can easily identify the hidden metals. That is, when this module is placed close to a metal, the buzzer here will ring.

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How the DIY metal detection kit works

Firstly, get an idea of how the components in this module are connected by the circuit diagram below.
DIY metal detector kit assembly
This module has a continuous running coil track on the PCB as well as several electronic devices. That mainly includes transistors, capacitors, resistors, an LED, and a buzzer. Also, this metal detector module includes a smooth circuit. That is, it emits smooth waves. When this circuit is powered on, the signal is constantly emitted. Also, Q1 (9018-transistor) provides the essential power pulse, which helps the tuned circuit to generate the signal.

The process when there is no metallic thing.

As the signal passes through the coil, the s9018 transistor emits an amplified signal to create an oscillation with amplitude at the starting point (L1) of the coil. (we can control the amplitude using VR1[variable resistor]) Afterward, this signal is amplified by the 9012 transistors. Also, the 2k resistor prevents the 100uf capacitor from charging. Then the Q3 (9012-transistor) becomes inactive, so the piezo buzzer remains inactive.

The process when there is a metallic thing.

In this case, the magnetic field amplitude on the coil (L2) decreases with the oscillating amplitude. Then the Q2 (9012-transistor) becomes inactive. Also, in Q3 (transistor 9012) a small voltage is produced between the base and the emitter. So, creating a small voltage between the pins of the piezo bus. Then the buzzer will ring.
Through this metal detection kit, we can identify metal parts at a distance of 30mm – 60mm. Also, we need to give a voltage of 3 to 5 volts to this module. Well, now we will connect the devices included here step by step. If you want this module you can buy it from the following links.
Disclosure: These Amazon links are Affiliate links. As an Amazon Associate, I earn from qualifying purchases.
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Step 1

Firstly, let’s identify these components.

Metal detector PCB

DIY metal detector kit assembly

5v buzzer

Wire connector terminal

DIY metal detector kit assembly


Variable resistor

100uf capacitor

LED bulb

200k resistor

2k resistor

470-ohm resistor

S9012 transistor x 2

S9018 transistor x 1

104 capacitor x 2

222 capacitor x 2

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Step 2

Secondly, let’s solder these components. Then first solder the 2k resistor.
DIY metal detector kit assembly

Step 3

Thirdly, solder the two c222 capacitors.
DIY metal detector kit assembly

Step 4

Next, connect the LED and the 470-ohm resistor.

Step 5

Afterward, attach the s9012 transistor and the s9018 transistor.
DIY metal detector kit assembly
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Step 6

Next time attach the 200k resistor and 5v buzzer.

Step 7

Then solder the 100uf capacitor and the 104 capacitors.

Step 8

Next, attach the variable resistor and the S9012 transistor.

Step 9

Lastly, attach the switch and the wire connector terminal.
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Step 10

Now, connect this metal detector to a voltage between 3v to 5v. Next, calibrate this metal detector module. Use the variable resistor for that.
OK now, check this metal detection module. The full video guide is below. We will meet in the next tutorial.

DIY metal detector kit assembly | Step by step instructions

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