Single chip metal detector circuit

john January 18, 2011 39 Comments

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.
Comments
  • Ahmed Sami
    March 24, 2015

    What is D1?

  • sakthicel
    October 18, 2014

    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….

  • nganga stephen
    June 15, 2014

    thank fod the assisrance in electronics circuitrg

  • sandhya
    April 24, 2014

    what kind of ic can be used insted of ic cs209a.

    • Seetharaman
      April 25, 2014

      No other IC can be used. It is a custom IC for the application.

  • saad
    April 23, 2014

    can i use a 120uH inductor instead? 100uH is not available in markets here

    • Seetharaman
      April 24, 2014

      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

  • mayank
    March 27, 2014

    hi can this circuit be modified so that its range can be increased
    Plz reply
    thank you

    • Seetharaman
      March 28, 2014

      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.

  • January 25, 2014

    how much is the distance that the circit find metal (in meters)?
    can we use it as a vehicle presence sensor?

  • July 17, 2013

    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.

  • aygin
    July 11, 2013

    all of comments are just questions, is there any body to answer???

  • May 31, 2013

    Hello, I just wanted to mention, I disagree. Your post doesn’t make any sense.

  • December 21, 2012

    Sir,CS209A is not available in our region.Is any IC instead of this.
    Plz reply.

  • November 26, 2012

    looking forward to get electronic circuit projects

  • Bala
    May 3, 2012

    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?

  • March 19, 2012

    i need more explanation about this project

  • seetharaman
    November 4, 2011

    Hi Prateek 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
    refer
    http://md4u.ru/ppoint/CS209.pdf

  • Akash
    November 2, 2011

    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 .

  • August 16, 2011

    how to wind or make L1 inductor.
    Plz reply

    Thanks in advance

  • seetharaman
    August 6, 2011

    Hi Ashish go through the manufacturers datasheet will get all the details.
    http://md4u.ru/ppoint/CS209.pdf

  • ashish
    August 6, 2011

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

  • seetharaman
    August 5, 2011

    Hi Wajahat refer the datasheet. you have to wind on siemens torroid with litz wire.
    L: Core: Siemens B65531-D-R-33
    52 Turns, 6×44 AWG, Litz Unserved
    Single Polyurethane
    http://md4u.ru/ppoint/CS209.pdf

  • wajahat
    August 4, 2011

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

  • mike
    August 2, 2011

    how das it work?

  • walteca
    June 30, 2011

    view a TDA0161 ic
    best regards

  • kiran
    June 27, 2011

    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

  • seetharaman
    June 27, 2011

    Hi Friends kindly go through following data sheet which has all the details you want.
    http://www.datasheetcatalog.org/datasheet/CherrySemiconductor/mXutsur.pdf

  • Usulogbo Beauty Erumena
    June 26, 2011

    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?

  • Usulogbo Beauty Erumena
    June 26, 2011

    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.

  • Rakesh
    March 30, 2011

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

  • March 21, 2011

    SIR,

    I AM AN ENGINEERING ASPIRANT FROM SOUTH INDIA,CAN YOU PLEASE HELP ME WITH SOME REPLACEMENT IN THIS IC CS-209A,WHICH IS NOT AVAILABLE IN OUR REGION.

    MY MAIL ID IS [ myfaithnka@gmail.com ]

    THANKS IN ADVANCE.

  • nelson theophilus
    March 10, 2011

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

  • sheka leonard
    February 6, 2011

    I like the circuit so I need more detail

  • ananthnag
    January 11, 2011

    the CS209A chip is no longer available…

  • jose morales
    December 9, 2010

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

  • sham
    November 16, 2010

    how to wind L1 coil?

  • viral
    September 11, 2010

    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

  • vineeth
    August 11, 2010

    give me d details on metal detector

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