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    The heart of this diy metal detector circuit is the CS209A IC. The metal detector is built with one 100µH coil that has 40 mm in diameter and is made of 50 turns/0.4 mm wire. CS209A has one oscillator wich forms a LC circuit, the inductance of the coil will change when it is near metal objects.

    LED 1 will light up and the buzzer turns ON when the coil is changing inductance. The setup is easy, VR1 is adjusted (away from any metal objects) so that LED 1 will light and the buzzer sounds on, and then VR1 will be trimmed until led and buzzer are off.

    DIY Metal Detector Circuit Schematic

    cs209A metal detector circuit

    cs209 metal detector on breadboard

    This is the updated and working circuit. The old one can be seen here and has a lot of errors. This is why not every circuit available on the WWW is trustworthy.

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    15 Responses to "Metal Detector DIY Circuit"

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    1. you should mark the connection points of the IC and also what is 2n2.

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      • 2nF2V
        Two nano farads ; two volts

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      • P. Marian electrolover says: on February 14, 2009 at 9:36 am
          member

        This is not such a good design for a metal detector, you should search something else. 2n2 = 2.2 nano Farads

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      • roland says: on May 4, 2012 at 7:50 pm

        plz send to me how to creat a metal detector thank you

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      • It works for large stuff but wouldn’t detect a gold ring at 2″
        If you want to actually build something decent
        go to http://www.miymd.com, the guy there is soon
        going to release a kit on par with the ML GPX units
        for a fraction of the price

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    2. 1000pf=1nf
      1000nf=1mf
      so 2.2nf=2200pf or0.22mf

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      • correction to “so 2.2nf=2200pf or0.22mf”
        0.22uF = 220 000pF.
        Here is the correct way:
        …so 2.2nF=2200pF OR 0.0022uF.

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    3. The answer to the first question. 2N2 is a non polorized ceramic capacitor with the capacitance value of 2.2 Nano farad.

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    4. What are the details of the search coil that you made, the diameter, wire size, and how many turns for the coil?

      Thanks… Tom

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      • Margaret M says: on October 29, 2011 at 12:09 am

        The coil is a small inductor whose value has aready been determined in Henrys ie 100 micro. this component is not unlike the size of a 0.25 resistor.

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    5. does it work??

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    6. Thanks , I’ve just been looking for information approximately this subject for a while and yours is the best I have came upon so far. However, what about the bottom line? Are you sure in regards to the source?|What i do not realize is in truth how you are now not really much more well-favored than you might be right now. You are very intelligent.

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    7. วงจรตัวนี้ตรวจจับโลหะได้ระยะกี่ cm ขอบคุณที่ตอบนะ

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    8. This is a metal detector in a few cm.

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    9. nini pelet says: on September 5, 2013 at 2:57 pm

      is not complete , caps 10u &100u ,how many Volt? because many kind with the same number in micro par or other.. please more detail, that will easy me 4 try you experiment. thanks you

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