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.
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.
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.