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Simple metal detector circuit
Hello friends, today we’ll talk about a home-made metal detector. At first I found a circuit on the Internet based on the NE555P timer chip, but it seemed to me too complicated for those who do not understand the notation on the radio circuits, and it is also difficult to output it to the board. Therefore, I redid the circuit a little, and we will assemble it with something in between the board and the mounted installation. Here is the diagram itself:
DIY simple metal detector circuit

We will need

  • Chip NE555P.
  • Resistor 51 kOhm.
  • 2.2 uF capacitor (2 pieces).
  • Capacitor 10 uF.
  • Buzzer.
  • Battery type "Krona" and a connector for it.
  • 0.2 mm copper wire.
  • Cardboard 1-2 mm thick.

Making a simple metal detector

DIY simple metal detector circuit

We will assemble the circuit on a piece of cardboard. In it, for every detail, I made holes with a needle, since the legs of the radio components themselves are too thin. First, insert the chip. Now solder the minus foot of the 2.2 uF capacitor to the very first foot.
DIY simple metal detector circuit

Now insert the resistor. We solder one leg to the second foot of the microcircuit and the plus of the capacitor. Solder the second leg to the third foot of the microcircuit.
DIY simple metal detector circuit

Now insert a 2.2 uF capacitor. We solder the negative leg to the third leg of the microcircuit. Positive will later go to the coil, we will produce it later. I soldered one wire to this leg. Also solder one wire to the second leg.
DIY simple metal detector circuit

DIY simple metal detector circuit

To the negative foot of the 2.2 uF capacitor, solder the plus foot of the capacitor to 10 uF. You must connect the buzzer leg to the negative one. The remaining buzzer leg is connected to the first leg of the chip. To connect the buzzer, I use blue and pink wires in the diagram.
DIY simple metal detector circuit

Now it remains to short-circuit the second and sixth legs of the microcircuit. And also the fourth and eighth, to the eighth solder the plus wire from the connector for the crown. Solder the negative wire from the connector to the first foot of the microcircuit.
The circuit itself is ready for this.
DIY simple metal detector circuit

DIY simple metal detector circuit

Now make a reel. It will require two CDs or DWDs. From cardboard we cut a circle with a diameter of 50 mm.
DIY simple metal detector circuit

Now glue 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 scraped to make the surface rough, and instead of superglue, I used hot-melt adhesive. Now we begin to wind the wire onto the cardboard. You need to wind 315 turns. After winding, solder the ends of the coil to the two wires that were output earlier (I have them black). This completes the manufacture of the metal detector. All that remains for him is to make a pen.
The board turned out to be very compact and even together with the crown will fit into almost any case. You can take a thick PVC pipe, cut one end at 45 degrees, and stick a coil to it. And place the circuit and crown in the pipe itself. As soon as you insert the battery, the buzzer will start to squeak, and when the coil is above the metal, the buzzer will squeak differently, I think you will immediately understand.
DIY simple metal detector circuit
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Comments (6)
  1. Ilnur
    #1 Ilnur Guests April 5, 2018 4:36 p.m.
    And on which cardboard and how are 315 turns wound?
  2. A. Bekjan
    #2 A. Bekjan Guests April 7, 2018 13:29
    can video of all this and with the test
  3. Fedya
    #3 Fedya Guests April 19, 2018 20:00
    Well, you are our knee inventor
    on ... reel yourself
    1. Guest Eugene
      #4 Guest Eugene Guests 27 June 2017 05:49 a.m.; 2 years ago, 2 years old. # 5: .superb.., #B.., A .b., .Bet.;..;; Aaaaaa; .b.; A. Aaaaaaaaaaaaahh., AaaaaaaaaaaaaaaaaaaaaaaaaahhahaHaaaaaahaaaaaaahHaHhHHhhhtHhhhhthdhhhshhhhshhhthhhthhhshhhhhshhhhhhhvhhhhvhhmhhvhhdhhmhhhdhhhvhhhhfhmhhvhhfh jhhvhtjhtjvt 27th jhulya aktamo pokhtat
      Well, you are a true, "fedya"! Already probably reeled, a fan of reeling.
  4. Guest Alexander
    #5 Guest Alexander Guests June 17, 2018 09:08
    radius (depth) of action?
  5. Zhas
    #6 Zhas Guests April 29, 2019 20:46
    You can use the MICRO circuit NE555N

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