I don't think that shielding materials will effect the depth in a direct way, maybe when you shielded the coil with a certain material, that would effect the inductance some how, that's why you get a greater depth with the graphite shielded search head. Thank you for this rewarding video, I learned some technics from you . Good luck 🙂
Over my head... but cool to watch. Very skillful. Must be an electrical engineer? Retired? I'd be happy just to make the simplest/basic bare-bones metal detector. Just turn it on and it works.
The wire that you used to contact the graphite varnish can spoil the performance of the device, as it forms a closed loop next to the winding. The fact that it goes at an angle at every point does not really matter, because integrally it forms a single conductor. However, it is apparently impossible to completely abandon shielding, therefore, the ends of the wire should be connected to the ends of a symmetrical resistive voltage divider, the resistance of which should be selected based on the balance of noise immunity and signal attenuation. And already the middle point of this voltage divider can be connected to the common wire of the device.
A very impressive piece of work!! I would like to build one however I can't find 0.25 mm wire. Could I use 0.3mm instead? How many turns would I need? Hope you can help me out here.
Just finished the Barracuda, Have a Surf kit waiting for the Some Day. TGSL is on the bucket list but mine will be modded to run at 25Khz for small gold. Good Video. Thank You.
I am building at the moment a CC coil because I am looking for artifacts. You are probably looking for minerals, so the 25Khz. My respect, good luck for the project!
I can't stop watching your video tutorial. It's fantastic. I'm reading all the information about this design. I finished my first metal detector yesterday. It's based on the krot2 circuit and for the moment I'm only testing the analog part. I made the coils but they are my first try and I'm too far from the nuling point of the coils. Now i'm making a mold to make a super tight coils. The screw adjusting design is so clever and I want to incorporate your idea in my search coil. Can you upload more videos using your detector? Thanks. Diego
Hello Diego. I am pleased by your interest. Unfortunately, I do not have time for my hobby now. (House building) I plan my next video in the spring. The krot2 circuit was not known to me, it's very interesting with the ATXmega 32 and the LCD display. I keep the fingers crossed, that everything works at your project.
Hello again EPAE. NoW after 3 months of work, design and building I'm near to finish my detector tgsl. Thanks to the inspiration that your video gave to me. (Thanks) Now I'm waiting for the epoxy to secure the coils inside the mold. I have shielded the coils with copper foil, but I don't know If it's good idea to give a layer of graphite paint to the plastic case, and if it is, how to make and were to make the gaps to avoid loops? That's the last step to finish the most sensitive part of the detector and because you only have one try i'm afraid of it. Thanks. Have nice day
DHobbies Hi How did you make the electric chips,,,, I didn’t follow up in the video!!! May you plz refer me to some videos if any Thanks a lot Urs Morad
EPAE : I thank you from the bottom of my heart, and I wish you continued health and wellness, and may God grant you success in what He loves and is pleased with, and forward
Hello, greetings from Mexico, The video is very, very good, it explains everything very well. my question is the following, how to know the frequency. for example for gold, silver, and how to make a coil for a greater depth.
Absolutely love your work and explanation of how to build this device. Your device seems to be the best out of all the DYI's out there, because you have complete control out of tuning it up. The demonstrations on each step of the build process. The next circuit add on could be depth amplification and make it waterproof. This way you can place the coil in water in small streams or lakes. Can your device penetrate rock and detect metal inside? Such as those rocks people hide their keys in as a test? Since silver is normally found inside rocks. I could see you making and selling these and people would buy, because yours looks professionally made. Sometimes things break, so having sections for sale such as a new coil and housing. The circuit board and casing. I remember how easy it was to buy components at a radio shack. Now, parts aren't as easy to get. ECG and HSK used to be the go to for ordering all your parts. What country are you from?
I'm still looking at vaccum forming as a massive advancement in my current design process. At the moment I'm still building housings out of sheet material. XD
Naw boo, they both have their own rolls to play. Vacuum forming is much better for manufacturing robust thing quickly, where 3D printing is much better at prototyping and or producing small and complex structures. The real mind bender is when you 3D print a vacuum mold. Oh ya, and I also got a fun fact: there's only 20 years between their inventions... 64 for vacuum forming and 84 for 3D printing. That's right, 3D printing came out 12 years after the last time we went to the moon.
Hello!I have a question about the simulation of this schematic.I am using Orcad 9.2 and i have problems with block 13 and 12.I don t know why my audio amplifier doesn t do the work and in think the main problem coud be the output of the 12 block.Can you help me?Or give me an idea of what can be the problem?Or can you show me what should be the output when it detects a metal?
what happens if you do 3 rings inside each other and 3 on top of the existing ones... so you have a total of 9 coils in a electrical heater pattern? how deep could that go? and how much energy?
Do you have this unit for sale yet? I would be interested if the price is cheap enough. Also does the graphene \ graphite layer help in the detection of gold or hurt the depth. I want to tune it to find only gold at about 1 1/2 feet max.
I liked your video. Very simple and right to the point. I Loved the construction methods from beginning to end, all homemade projects. Ve forry Nice. Maybe you should make a kit and sell it, I would most likely buy one. Thanks for your video. I subscribed and gave thumbs up. Cheers.
What is the wire type and size of each D coil and what is the wire wrapped over the graphite tape? Awesome job mate. I want to build one for my Garrett AT Gold. I notice that Garrett does something very similar, the use 32ga on one side and 25ga on the other side. All magnetic wire and graphite powder mixed with epoxy as a coating over each coil.
Excellent video. I would like to have discovered it before starting my project. I'm making my coils for the IB metal detector. I reduced the voltage on the receiving coil by less than 1mVrms @ 10kHz. Why didn't you set the voltage on the receiving coil to a minimum? Thanks
@@UnitSe7en Imagine a signal with 1mVpp at the receiver, added with 100mVpp of continuous unbalance between the transmitter and receiver coils. Now imagine the same signal with 1mVpp at the receiver, added with only 1mVpp of continuous unbalance between the transmitter and receiver coils. Which condition is the easiest to detect the signal?
minimum signal voltage like 1mv peak t peak will be in certain phase woth reference to the tx signal , then discrimination will not work properly. A combination of phase and lower voltage on RX ends are required for discrimination to work properly, not just a lower voltage , in short it is an "And" function voltage × phase 🙋
Sehr interessantes Video. Dank dafür! Sofern ich das richtig verstehe, könnte ich die Spulenplattform auch aus mit Glasfaser verstärktem Balsaholzkern konstruieren, da ich keinen unmittelbaren Funktionsgewinn im Bezug auf die elektronische Wirkweise der Spulen durch die die Verwendung eines Thermoplasts erkenne. Sehe ich das richtig so? Oder habe ich etwas übersehen?
Hi Patriche! The shell itself is not shielded with something. On the contrary, I have roughened the inner surface slightly , for a good connection with the resin. Also for thermoforming I didnt use anything. Graphite is only in the shielding of the coils.
Puede subtitular el vídeo ? Me gustaría encontrar información de los componentes en español si no es mucha molestia y el proceso para hacer el revestimiento de la bovina es una locura primera vez que veo eso en mi vida !! Gracias por el vídeo y por favor ayudeme !!
Hola. Por favor, no te decepciones! Lamentablemente, tengo muy poco tiempo. Pero quiero ayudarte. Haga sus preguntas y las responderé. Estoy feliz por su interés.
OI, PODE INFORMAR ONDE CONECTAR FIO DA BOBINA NO TX E RX DO IGSL SASCHO S, 2 TOM ? INICIO ENRROLAMENTO TX E RX NA PLACA PCB ? CONECAO INICIO ENRROLAMENTO NA PLACA ? E FIM ENRROLAMENTO NA PLACA ?
Hab noch eine Frage: Wie hast du die Spulen fixiert bevor du den 2K - Kleber draufgetan hast? Mir fallen die Windungen auseinander und die Schnur bekomme ich nur schwer wieder runter.
Hallo Mathias! Fixiert habe ich die noch lose Spule zunächst nicht mit einer Schnur (Faden), sondern mit einem 4mm breiten Streifen Klebeband sehr steil gewickelt. Achte darauf, dass die Spule möglichst kompakt bleibt. Dannanch kam ein 5 min. Epoxi darüber. Nicht zuviel ! Als es es noch nicht total fest war, zog ich das Klebeband wieder ab, und strich noch eine weitere Lage Epoxi drüber. Also Geduld und viel Glück! EPAE
Great work! I just started to make my own but i have a problem with the correct Copper cable. I can't find 0.25 mm, how can i calculate the number of turns with 0.30 mm or 0.40 mm. Thx.
Hello first. The best coil calculator is the " LCFR" (Lcfr.zip, 4KB), I think. Not to spite of that, the 0.25mm is best suited. I did not get him too, so i used the 0.28 mm. Important is the inductance and the self-resonance of your coil. 14.5kHz and Tx 6.0mH, Rx 6.5 mH. Greatigs!
Olá Sr. Epae, eu não conseguia entender como você fez o escudo, em que ponto você usou a pintura grafite, você poderia explicar melhor como fazê-lo? Eu estou terminando meu tgsl, a versão que eu estou fazendo é o que contém cd4024 sem ser o TGSL-EDU. Obrigado antecipadamente e trabalho bonito, parabéns.
Hi Rani !!! Thanks for your assessment. At the beginning is the finished coil. Then I armored them with epoxy. Of course, the epoxy also insulates the wires of the coil. The graphite lacquer layer is sprayed directly on the coil, and not inside the housing! So the shield is located directly on the coil. The thin bare wires ensure an intensive contact with the gerphite layer. The coil thus has a similarity with a shielded cable. It was important to me that a metal shield dampens a metal detector. Graphite does not do this! I hope I could help you.
Hello again Epae. Maibe you are busy this days, but I have a question for you. I'm trying to find the answer in the forums but I can't find the correct one. My question is about the phase shift. Originally the phase shift is 20° and that means more or less 4us between the TX and RX (for 14,5kHz) but in your video you have aprox 11us. With my detector I get the best performance with 12us to 14us which is aprox the 20% (not 20°) of delay. So, people are talking about degrees or % of delay. Thanks!!!
Hello, your question pleases me! It is the first time this question is asked! These 20 ° refer to a sinusoid. A quarter sinus curve goes from the zero line up to the maximum, that is 90 °. It can be seen on the oscillograph about a quarter of 90 °, about 22 °. The 11μS gives me my oscillograph. I did not recalculate this. I took this from the construction manual "TGLS 101 - hobbielektronika" page 20 chapter "Advanced Nulling Methods". Look at it, maybe I misunderstood something? In the meantime, experience has shown to me that a little less overlap is better. Interferences are reduced. Now i adjust my coil about 5 ° overlap. A calculation of frequency, sine wave to time, leads in my opinion to no better results. I'm doing this pragmatically. I know you would have preferred a more specific answer. But........ Greetings!
