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  • #91
    Originally posted by Geo View Post
    Thank you Esteban.
    Maybe next week to have time to try it
    My regards
    Maybe you have saved the constructional of aluminiun loop and core. This I post time ago, but here repost.

    Regards
    Attached Files

    Comment


    • #92
      Originally posted by Esteban View Post
      Maybe you have saved the constructional of aluminiun loop and core. This I post time ago, but here repost.

      Regards
      Hi Esteban,
      I saw this picture from you... posted on page 2 of this thread...

      Now... I know that circuit cause was employed in a pinpointer stuff (russian schematic based on that magazine too, I think first time I saw it was around 1989, is that possible ?) but know for use in pinpointers not LRL. I remember there's a lowered amplitude when e.g. iron is near...

      Now this that's really surprising to me... see that stuff used for LRLs too I mean! It's very basic circuit , kind of hartley osc...

      Which kind of signal variations you read in presence of a gold target ?

      And which is the range you noticed from it LRL behaviour in relationship with which target/size ?

      Kind regards,
      Max
      Attached Files

      "Kill for gain or shoot to maim...
      But we dont need a reason
      "

      someone said...

      Comment


      • #93
        Originally posted by Max View Post
        Hi Esteban,
        I saw this picture from you... posted on page 2 of this thread...

        Now... I know that circuit cause was employed in a pinpointer stuff (russian schematic based on that magazine too, I think first time I saw it was around 1989, is that possible ?) but know for use in pinpointers not LRL. I remember there's a lowered amplitude when e.g. iron is near...

        Now this that's really surprising to me... see that stuff used for LRLs too I mean! It's very basic circuit , kind of hartley osc...

        Which kind of signal variations you read in presence of a gold target ?

        And which is the range you noticed from it LRL behaviour in relationship with which target/size ?

        Kind regards,
        Max
        This is not the only circuit. This works as resonance off. Amplifier circuit uses a LM358 and 4066. Also a radio and beeper, so is 2 detector in one.

        Distance for small things can be 5 m, a treasure can be detected at 30 m.

        I don't read nothing, I hear the beeps!

        Comment


        • #94
          Originally posted by Esteban View Post
          This is not the only circuit. This works as resonance off. Amplifier circuit uses a LM358 and 4066. Also a radio and beeper, so is 2 detector in one.

          Distance for small things can be 5 m, a treasure can be detected at 30 m.

          I don't read nothing, I hear the beeps!
          Hi,
          yes... but you provide data for coil... but not the other stuff...

          Don't understand why you post coil data and then nothing else... so the thing you posted is just an oscillator !?

          So... why ?

          Ok, your choice... but that's not easy belive it can be used with success in real, working LRL... it's really low power... and not "state of the art" about stability.

          I think people will belive in LRLs if a REAL and COMPLETE schematic will be posted... and anyone could replicate and check if works or not.

          Don't need 30 meters or 5 meters range... also 50cm for a coin could be enough to show people if device works or not... but that needs you post something complete... not pieces.

          Kind regards,
          Max

          "Kill for gain or shoot to maim...
          But we dont need a reason
          "

          someone said...

          Comment


          • #95
            Hi Max.
            As Esteban wrote it is a circuit from Andy Flind. I have the schematic so Esteban gives me info about the coil. But i like the open loop.

            Esteban, if i will not use the radio, at who distance may i locate a big object?? other can you tell me how to connect the radio to the magnetic field detector???

            Regards
            Geo

            Comment


            • #96
              Originally posted by Geo View Post
              Hi Max.
              As Esteban wrote it is a circuit from Andy Flind. I have the schematic so Esteban gives me info about the coil. But i like the open loop.

              Esteban, if i will not use the radio, at who distance may i locate a big object?? other can you tell me how to connect the radio to the magnetic field detector???

              Regards
              The oscillator and Andy Flind's circuit are different things!

              Maybe 30 meters... The input reductor in circuit (2K2) you must reduced for better sensibility.
              Attached Files

              Comment


              • #97
                Geo

                Also, can be via trafo:
                Attached Files

                Comment


                • #98
                  Maybe admins can obtain permission of EPE for to post this:
                  Attached Files

                  Comment


                  • #99
                    Originally posted by Esteban View Post
                    The oscillator and Andy Flind's circuit are different things!

                    Maybe 30 meters... The input reductor in circuit (2K2) you must reduced for better sensibility.

                    Hi Esteban.
                    Thank you.
                    Some questions yet.
                    Does The antenna of radio must connected to c1 or must be a wire near the loop???
                    I suppose that i must use different power supply for radio and MFD.
                    At who frequency must tune the radio???

                    My Regards
                    Geo

                    Comment


                    • Originally posted by Esteban View Post
                      Maybe admins can obtain permission of EPE for to post this:
                      Which was original purpose of this circuit ?

                      Magnetic anomaly detector ?

                      Kind regards,
                      Max

                      "Kill for gain or shoot to maim...
                      But we dont need a reason
                      "

                      someone said...

                      Comment


                      • Originally posted by Esteban View Post
                        Maybe admins can obtain permission of EPE for to post this:

                        Hi Esteban
                        Please say me what number and year published this article ?
                        Best regards.

                        Comment


                        • Originally posted by aft_72005 View Post
                          Hi Esteban
                          Please say me what number and year published this article ?
                          Best regards.
                          It looks like January 1995, but I cannot be absolutely certain about the year, as the resolution is so poor. The caption says it's a Magnetic Field Detector.

                          Comment


                          • Hi afl_72005, the article was published on december 1999.
                            I have it and i can share it, not here of course.
                            Regards
                            Nelson


                            Originally posted by aft_72005 View Post
                            Hi Esteban
                            Please say me what number and year published this article ?
                            Best regards.

                            Comment


                            • I agree

                              Originally posted by Max View Post
                              Hi,
                              yes... but you provide data for coil... but not the other stuff...

                              Don't understand why you post coil data and then nothing else... so the thing you posted is just an oscillator !?

                              So... why ?

                              Ok, your choice... but that's not easy belive it can be used with success in real, working LRL... it's really low power... and not "state of the art" about stability.

                              I think people will belive in LRLs if a REAL and COMPLETE schematic will be posted... and anyone could replicate and check if works or not.

                              Don't need 30 meters or 5 meters range... also 50cm for a coin could be enough to show people if device works or not... but that needs you post something complete... not pieces.

                              Kind regards,
                              Max

                              Comment


                              • Originally posted by Qiaozhi View Post
                                It looks like January 1995, but I cannot be absolutely certain about the year, as the resolution is so poor. The caption says it's a Magnetic Field Detector.


                                Hi Qiaozhi


                                ..................

                                Comment

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