Simple metal detector circuit

Hello friends, today we will talk about a homemade metal detector. At first, I found a scheme on the Internet based on the NE555P chip-timer, but it seemed to me too complicated for those who do not understand the notation on the radio circuits, and it’s also difficult to display it on the board. Therefore, I have altered the scheme a little, and we will be collecting it somewhere between the board and the mounted installation. Here is the scheme itself:
The scheme of a simple metal detector with their own hands

We need

  • The chip NE555P.
  • Resistor 51
  • Condenser 2.2 μF (2 pieces).
  • Condenser 10 μF.
  • The buzzer. >
  • A battery of the "Crohn" type and a connector for it.
  • Copper wire 0.2 mm.
  • Cardboard with a thickness of 1-2 mm.

Making a simple metal detector

The scheme of a simple metal detector with their own hands
We will assemble the scheme on a piece of cardboard. In it for every detail I made holes with the help of a needle, because the legs of the radio components themselves are too thin. To begin with we insert a microcircuit.Now we solder the negative foot of the capacitor to 2.2 microfarads to the very first foot.
The scheme of a simple metal detector with their own hands
Now we insert a resistor. Solder one foot to the second leg of the chip and the plus of the capacitor. Solder the second leg to the third leg of the chip.
Scheme of a simple metal detector with your own hands
Now we insert a 2.2 microfarad capacitor. The minus leg is also soldered to the third leg of the microcircuit. Plus will go to the coil later, we will make it later. I soldered one wire to this leg. We also solder one wire to the second leg.
Diagram of a simple metal detector with your own hands
Scheme of a simple metal detector with your own hands
Soldering the negative leg of the capacitor by 2.2 μF soldered the positive leg of the capacitor at 10 μF. By minus you need to connect the leg of the buzzer. The remaining leg of the buzzer is connected to the first leg of the chip. To connect the buzzer, I have blue and pink wires on my circuit.
Scheme of a simple metal detector with your own hands
Now it remains to short-circuit the second and sixth legs of the chip.And also the fourth and eighth, to the eighth solder the positive wire from the connector for the crown. The negative wire from the connector is soldered to the first paw of the microcircuit. The circuit itself is ready for this. Diagram of a simple metal detector with your own hands
The scheme of a simple metal detector with their own hands
Now we will make a coil. It will require two CD or DWD discs. Cut out a cardboard with a circle with a diameter of 50 mm. "style =" max- width: 100%; " alt="The scheme of a simple metal detector with their own hands"> Now we paste this circle between the disks. At first I tried to use superglue, but it did not glue anything. Therefore, the bonding places on the disks had to be skewed to make the surface rough, and instead of superglue I used hot melt glue. Now we begin to wind the wire on the cardboard. Need to wind 315 turns. After winding, solder the ends of the coil to the two wires that were removed before (they are black for me). This completes the manufacture of the metal detector. For him, it remains to make only a pen. The board turned out to be very compact and even with crown will fit in almost any case.You can take a thick PVC pipe, cut one end at 45 degrees, and stick a coil to it. A scheme and crown placed in the pipe itself. As soon as you insert the battery, the buzzer will start to squeak, and when the coil is over the metal, the buzzer will start to squeak differently, I think you will immediately understand.div>

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