Single chip metal detector circuit

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Description.
This is a simple single chip metal detector circuit based on IC CS209A from the Cherry Semiconductors. A 100uH coil is used to sense the presence of metal. The IC CS209A has a built in oscillator circuit and the coil L1 forms a part of its external LC circuit which determines the frequency of oscillation. The inductance of the coil change in the presence of metals and the resultant change in oscillation is demodulated to create an alarm. The LED gives a visual indication too. This circuit can sense metals up to a distance of few inches.

Circuit diagram with Parts list.

single-chip-metal-detector-circuit

Notes.

  • Assemble the circuit on a general purpose PCB.
  • The switch S1 can be a slide type ON/OFF switch.
  • The IC must be mounted on a holder.
  • The POT R1 can be used to adjust the sensitivity of the circuit.

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42 thoughts on “Single chip metal detector circuit”

  2. sakthicel

    CN I use this type sensor to detect a train for my project…… I want to know the technical specification of it…… Pls reply me….

    1. Seetharaman

      You can try. but as per IC manufacturers’ recommendation you have to use 44AWG litz wire on siemens former.
      L: Core: Siemens B65531-D-R-33
      52 Turns, 6×44 AWG, Litz Unserved Single Polyurethane

    1. Seetharaman

      If the diameter of the search coil is increased It have more sensitivity. Try by winding 8 to 12 inch dia coil of 100uH.
      recommended by manufacturerL: Core: Siemens B65531-D-R-33 52 Turns, 6×44 AWG, Litz Unserved Single Polyurethane.

  8. daniel

    hi I am in search of a type of metal detector which can detect iron in 30cm distance.
    in fact I can modify your circuit for this distance.

  13. Bala

    Hi…
    What is the maximum range of this circuit?
    I mean the maximum distance it can detect the metal.
    How much turns should i have in the searching coil?

  15. Akash

    hii sir
    actually i want to know that , is it possible to detect every element by a detector ( any detector) means ,Can anything be detected ????
    like IC cs209a , which can detect metal easily .

  20. wajahat

    i saw the metal detector project on ur website. how to wind or make L1 inductor.plz reply

  23. kiran

    dear sir,
    my cricket ball gets lost when il b playing cricket. so is there any circuit that can detect the ball. please send the circuit if it is available {simple circuit}.

    thankyou
    from kiran

  25. Usulogbo Beauty Erumena

    Please i need a detail explanation on this circuit and the function of each component in the circuit.Can anything be done to this circuit to get 50watt alarm system?

  26. Usulogbo Beauty Erumena

    Please,can u elaborate on the working of this circuit and the function of each component in the circuit? I need it for my school project.

  27. Rakesh

    can u please elaborate the working of this circuit?
    can this circuit be made on a bread board?

  29. nelson theophilus

    please, i need more explanation on the circuit and the functions each component in the circuit

  32. jose morales

    hi,i sale from colombia “the DORADO”,a PIC microcontroller programmed how metal detector on a chip…VERY EASY METAL DETECTOR CIRCUIT WITH LCD!!!

  34. viral

    give me d detalils on metal detetor.
    i need this on my college project
    plz waiting….

    i need working and current flow on this metal detector circuit

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