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A New Design Based on an Old Idea

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  • A New Design Based on an Old Idea

    Hello everyone. After being away for a long time, I’ve finally returned to the world of long-range metal detectors and electronics, and I truly missed all of my dear friends here.

    After coming back, I decided to focus on developing a new detector system. If any friends are interested, I would be happy for us to exchange information and collaborate on improving this type of detector together.

    Many years ago, a design from our dear friend Geo was posted on this forum — if I’m not mistaken, it was around 2012. I liked the operating concept of that type of detector and became interested in working on similar systems.

    I have attached an image to this post that shows the general idea of the design I have in mind.

    Have any of you had experience working with detectors of this type? Is the operating principle of these detectors reliable and acceptable? And do you think such designs are worth further development?

    I would also like to kindly ask our dear friend Geo, if he has any experience in this field, to share his knowledge and experiences with us.
    Geo

    Thank you all in advance for your cooperation and support.
    Knowledge is the greatest wealth

  • #2
    It looks better than just running one wire to the antenna.

    Quite a while back I hooked up a frequency generator to a Fred Stewart Sapphire directional locator rod. It came with a power pack that charged the person. I measured about one ohm so I assume it was a coil inside the handle. I don’t recall it working all that well but since then I have learned it’s best to walk in an “S” pattern to get a better response on the target, but I haven’t tried this technique. So maybe I will try this and see what happens. It’s not going to be exactly the same as your set-up.

    Or another option is to use two L-rods, one connected to the positive and one to the negative.
    Last edited by Mike(Mont); 05-29-2026, 12:43 AM.

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    • #3
      Originally posted by Mike(Mont) View Post
      It looks better than just running one wire to the antenna.

      Quite a while back I hooked up a frequency generator to a Fred Stewart Sapphire directional locator rod. It came with a power pack that charged the person. I measured about one ohm so I assume it was a coil inside the handle. I don’t recall it working all that well but since then I have learned it’s best to walk in an “S” pattern to get a better response on the target, but I haven’t tried this technique. So maybe I will try this and see what happens. It’s not going to be exactly the same as your set-up.

      Or another option is to use two L-rods, one connected to the positive and one to the negative.
      Thank you very much for your response, my dear friend.
      Could you explain a bit about the power pack and how it “charges” the human body? I’m very curious about the operating principle behind it, because honestly I find the concept quite fascinating.

      Knowledge is the greatest wealth

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      • #4
        It’s not much, just a 6 volt battery that runs a small current through a coil (I think) inside the handle. The info said it helped older people or on cold days. After a while you can turn it off. Some days I could feel a difference when aimed at or near the target. I can usually get a tingle in my left hand and the power pack enhances that.

        I’ve seen other similar devices. One just had the negative pole of a nine volt battery connected to the rod. Or if two rods the positive to the left rod and negative to the right rod. If you have any broken skin it gives a painful shock. Some have a variable resistor so you can adjust the power.
        Last edited by Mike(Mont); 05-29-2026, 04:08 PM.

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        • #5
          You probably know the Electroscope uses voltage discrimination. I forget now but something like 0,9 volts for gold and 1.5 volts for silver.

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          • #6
            I should point out that voltage discrimination is probably the least accurate form. Especially now in modern times it is so easy and cheap to buy a DDS frequency generator. Many of them use 5 volts so it’s easy to use a cellphone power bank to power them, but you need to get the right one. Many of the expensive models have electronics that need precise current requirements and they will shut down if you try to power a DDS.

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            • #8
              Thank you for following and contributing to this discussion.

              Personally, I do not believe in applying voltage directly to the brass rods. In my opinion, inductively coupling a signal to the antenna through a coil is far more effective than feeding a DC signal directly into the antenna.

              The idea of using the antenna itself as the core of a coil seems much more interesting and appealing than other conventional designs. I believe this approach deserves further investigation and experimentation.
              Knowledge is the greatest wealth

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              • #9
                Another fascinating idea that I am very interested in is the use of a ferrite-core frequency oscillator that begins to rotate when it reaches a point where a metal object is buried underground.

                The concept is quite intriguing, and I would be interested to know whether anyone has experimented with such a system or investigated the physical principles behind this type of response.
                The only part I do not fully understand is the reason behind the rotation. Could anyone explain what causes this movement?

                Is it possible that the device begins to rotate when it reaches a point where the resonant frequency of the buried metal object matches the resonant frequency of the oscillator? In other words, could resonance between the target and the oscillator be responsible for the observed rotation of the device?

                Knowledge is the greatest wealth

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                • #10
                  Yes, and also the coil
                  magnifies the signal more than just directly attaching it to the antenna.

                  since we are on this topic I have seen dowsing rods with no electronics that have a coil with one lead directly connected to the antenna. I think the idea is to create a longer antenna. Some people say there is an acoustic wavelength and this is much shorter.

                  Tim Williams has done some work on acoustic wavelengths. What he found was the wavelengths were very close to the Earth Field NMR frequencies. It would be easy to wind a coil to these lengths.

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                  • #11
                    If you scroll down to post #29 Tip #26 I explain how to calculate the earth field nmr frequencies. If you divide the speed of sound by the frequency you get the wavelength. Speed of sound is about 1100 feet per second or I think 343 meters per second.

                    So example if the gold frequency is 39 Hz you divide it into 1100 to get a wavelength of 29.2 feet or metric 8.79 meters but you have to do your own calculations for the magnetic field strength in your area. There are many cell phone apps for magnetometer or you can get an estimate from the website.

                    Last edited by Mike(Mont); 05-31-2026, 12:54 PM.

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                    • #12
                      Originally posted by mustefa ubram View Post
                      Another fascinating idea that I am very interested in is the use of a ferrite-core frequency oscillator that begins to rotate when it reaches a point where a metal object is buried underground.

                      The concept is quite intriguing, and I would be interested to know whether anyone has experimented with such a system or investigated the physical principles behind this type of response.
                      The only part I do not fully understand is the reason behind the rotation. Could anyone explain what causes this movement?

                      Is it possible that the device begins to rotate when it reaches a point where the resonant frequency of the buried metal object matches the resonant frequency of the oscillator? In other words, could resonance between the target and the oscillator be responsible for the observed rotation of the device?

                      The antenna aligns with the lines of force. I know some people get it to rotate when directly over the target, I don’t have that experience but I don’t try to get it to rotate.

                      My theory is the protons align with the magnetic pulse the same way a proton precession magnetometer does. Do the protons complete a 360 degree path? I don’t know but it certainly is possible if the resonant frequency is in tune.

                      Tim Williams says if the frequency is too high the signal line to the target will be to the right and if the frequency is too low the line will be to the left. He also talks about strobe tuning and this sounds like there is a circular motion that correlates with the target very much like a strobe light if the frequency matches.
                      Last edited by Mike(Mont); 06-01-2026, 05:38 PM.

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                      • #13

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                        • #14
                          Hello...
                          Based on my knowledge and research, the phenomenon or aura created by buried treasure is essentially a static, renewable, and variable electrical field. It is affected by climate, the external environment, and human activity, and appears to be very sharp and fluctuating. It bears the imprint of matter but has multiple harmonic frequencies, which is why it is so sharp and rapid. If this information is confirmed, and it seems very close to the truth, then you need a reference point, such as a programming device or a piece of gold, to obtain an analog signal for searching in the field. Otherwise, you are wasting your time.

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