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WHITE'S Surfmaster PI Schematics

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  • WHITE'S Surfmaster PI Schematics

    Found this on the web



    White's Surfmaster PI schematic diagram

    White's Surfmaster PI is a good quality, fully waterproof, lightweight metal detector with an exceptional depth in saltwater or mineralized ground. It's ideal for those wishing to search beaches, in the surf or shallow diving. It works inland too, but such use is not advised as -- like all PI (Pulse Induction) designs -- there is no effective discrimination of ferrous objects. Runs on eight AA size batteries.


    Notes

    • All resistors 1/4 watt +/-5% unless noted otherwise
    • Capacitors with values greater than 1uF are aluminium electrolytics (+80%, -20%)
    • Capacitors with values less than 1uF are polyester film type (+/-10%)
    • Nominal capacitor range of 0.001-0.39uF = polyester film.
    • Nominal capacitor range of 0.047-1uF = stacked polyester film.
    • ST = Stacked polyester (Panasonic "V" series) +/-5%.
    • Simple mod: If TIP32C (Q2) gets excessively hot, use an IRF9640 MOSFET instead. Experiment with different values for R6 to find the optimal value (I use a 390 ohm resistor). Temporarily substitute R6 for a trim potentiometer (470Ω or 1kΩ) to find the optimal dumping resistor for your coil.


    Parts list:

    Resistors:

    • R1, R10, R22, R35: 100kΩ
    • R2: 3.3kΩ
    • R3, R7, R8, R13, R14, R21, R33: 1kΩ
    • R4, R5: 100Ω
    • R6: 220Ω 1/2 W
    • R9: 1MΩ
    • R11, R20, R23, R32: 22kΩ
    • R12, R27: 10kΩ
    • R15, R16, R17: 220kΩ
    • R18: 47kΩ
    • R26, R29: 51kΩ
    • R28: 210kΩ
    • R34: 150Ω
    • R25: 50kΩ trim potentiometer
    • R10: 100kΩ trim potentiometer
    • R33: 1kΩ trim pot. (volume control)
    • P1: 10kΩ potentiometer (THRESH)
    • P2: 100kΩ potentiometer (DISC)

    Coil:

    Note: It's best to use the original Surfmaster coil for optimal performance, but you can experiment with different turns, wire gauge and coil diameters, shielding...
    A reasonable depth and sensitivity can be obtained with a 23cm diameter coil, 20 turns made with 0.5mm (24 gauge) standard copper enamel coated wire.
    Capacitors:

    • C1: 22nF
    • C2: 1000uF/25V electrolytic
    • C3, C4, C8, C16: 100nF
    • C5, C6, C7: 470nF
    • C9, C10, C11, C12: 1nF
    • C13, C14, C15: 220uF/10V electrolytic

    Transistors:

    • Q1: 2N3906 (PNP silicon transistor)
    • Q2: TIP32C (PNP silicon power transistor)
    • Q6: MPSA13 (NPN Darlington transistor)

    Diodes:

    • D1, D2, D3: 1N4148 (Switching diodes)
    • D6: 1N4001 (Rectifier diode)
    • D7: 1N5819 (Schottky Barrier Rectifier)
    • D5: 1N755 (7.5V Zener diode)

    Integrated circuits:

    • U1: TLC555 (LinCMOS timer IC)
    • U2: NE5534 (Single Low Noise Op Amp)
    • U3: LM358 (Low Power Dual Op Amp)
    • U4: MC14093B (Quad Schmitt trigger)
    • U5: 78L05 (5V Positive Voltage Regulator)
    • U6: ICL7660 (CMOS switched-capacitor voltage converter)
    • U7: CD4066 (Quad Bilateral Switch)
    Attached Files

  • #2
    a note. we have this schematic with all Mr. Bill's mods in forum.

    Comment


    • #3
      More mods

      Hello,

      Even more mods......
      Detects a 1 euro over 30 cm with the spiral coil, also small gold is no problem together with that coil....

      Regards.

      Ap
      Attached Files

      Comment


      • #4
        Please put here latest PCB for building WHITE'S Surfmaster PI,

        Did anyone build this device? what about it's performance?

        Comment


        • #5
          Geotechers,

          remember that in the original schematic we have the oldie problem:


          'In the Surf Pi C16 is missing / TLC 555 - pin 5.'

          yours

          Comment


          • #6
            Hi kt315,

            Please put here latest correct schematic and PCB for building WHITE'S Surfmaster PI,

            Did anyone build this device? what about it's performance?

            Comment


            • #7
              you are waiting a time I will find all links for you?

              http://www.geotech1.com/forums/showt...highlight=Surf
              http://www.geotech1.com/forums/showt...highlight=Surf

              ... strange people.

              Comment


              • #8
                Thanks kt315...

                Don't angry ...

                Comment


                • #9
                  Hello!

                  I've got maybe a silly question. Anybody can help me to identify these two signs in the schematic? I would like to build this md but I'm a totally beginner.
                  Sorry for my bad english.
                  Thanks for all.

                  http://kephost.hu/image-24E0_4BBC7CB8.jpg

                  Comment


                  • #10
                    Detector Coil and Head Phones!

                    Comment


                    • #11
                      Originally posted by ApBerg View Post
                      Hello,

                      Even more mods......
                      Detects a 1 euro over 30 cm with the spiral coil, also small gold is no problem together with that coil....

                      Regards.

                      Ap
                      Hi ApBerg.Detects and 1 euro over 30 cm with the spiral coil in the air or in the country? Have you tried what is below the range of bricks?

                      Comment


                      • #12
                        Bricks...

                        Hello Maikl,

                        The test was in air, and bricks.... if there is some iron in the bricks it is detecting those bricks.... so you can find bricks .......

                        Best regards

                        Ap

                        Comment


                        • #13
                          Originally posted by ApBerg View Post
                          Hello Maikl,

                          The test was in air, and bricks.... if there is some iron in the bricks it is detecting those bricks.... so you can find bricks ......
                          Ap, according our Russian experts in PI signal processing, you should eliminate signal from magnetic bricks and hot rocks if you adjust properly sample delay and the width of integrating window. Please try this.

                          Comment


                          • #14
                            Hello Mikebg,

                            Thanks for your info, I am thinking to make the HH with the micro prossesor, it is in the software not so hard (?) to make adjustments for the sample delay and window width....

                            Good luck.

                            Ap

                            Comment


                            • #15
                              Originally posted by ApBerg View Post
                              Hello,

                              Even more mods......
                              Detects a 1 euro over 30 cm with the spiral coil, also small gold is no problem together with that coil....

                              Regards.

                              Ap
                              Hi! APBERG

                              Congratulations for your Spiral Coil Design (I'll try too).


                              As can I see, you have made improvements at your SURF.
                              Could you post the PCB in Sprint Layout format?

                              Best regards
                              Dirceu

                              Comment

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