CCO Metal Detector
This is the CCO metal detector in operation, I'm using the republished modified circuit which uses a 4069 hex inverter and a TL071 to replace the AM radio in the original circuit.The coils are not the full 50 turns and made from the wrong gauge of wire also, they have yet to be mounted properly on something. The sensitivity of the circuit is too high, touching any parts or wires will cause random chaotic frequency shifts, even shielding the wires doesn't work since the main problem here is induction and not em waves. When complete, all parts of the circuit will have to be made rock solid so that they can't move relative to one another, other wise using the detector will be impossible.The pcb was made by grinding away the copper foil with a dremel and a small broken drill bit. Crude, but it works.
Home Made - Simple Metal Detector Beat Frequency Oscillator
It uses a single 4093 quad Schmitt NAND IC and a search coil. A lead from IC needs to be attached to a MW radio aerial, or should be wrapped around the radio. The metal detector is set up by tuning the MW radio to pick up a whistle (a harmonic of ). Note that not every such harmonic works best, and the most suitable one needs to be found. The presence of metal will then clearly change the tone of the whistle. Component list: 1. Integrated circuit = CD4093 ( HEF4093) 2. 390pF capacitor (up to 470pF) 3. 22pF capacitor (up to 47pF ) 4. Detection coil L1 = 50 turns of 0.1 -0/2mm solid wire (air-wound) / 120 mm diameter coil. You may use wire reclaimed from an old transformer. If you can't find wire to recycle need to buy enamel covered wire as in the specialized shops selling "magnet wire" (also search for shops which specialize in rewinding electric motors). Practically 50 turns need to be wound on a CD plastic case. Later cover the coil with a piece of aluminum foil. The aluminum foil must be tied to ground (negative power supply) with a separate wire. Leave a small gap on the aluminum shield. 5. Variable capacitor 10pF up to 330pF ( any variable capacitor starting from 0pF up to 510 pF) 6. Oscillator coil 60 up to 90 turns 0.1-0.2 mm solid wire on a small diameter ferrite core ( 2-3mm diameter, height 10mm up to 20mm) 7. 100nF capacitor -- power supply decoupling capacitor
bfo metal detector
bfo metal detector The original project about this from http://www.easytreasure.co.uk/bfo.htm , and my project page is http://www.kor.pe.kr/home/remodel/bfo/ . My project page has written by Korean. So you should use google translation service.
arduino metal detector project pt3
demonstrating a metal detection system using electric scooter PWM and AM radio-part of my learning curve in working towards the goal of making an arduino metal detector. this system uses the AM radio as a reciever and exploits the fact that a metal obejct close to the radio will detune it and effect the tone of the heterodyne whistle produced by the scooter PWM. no arduino is used in this video but since this is a rudimentry setup(using PWM that i have already demonstrated with the arduino)and since it is similar to what i hope to achieve with the arduino i have included it in the arduino metal detector series.
How to Repair Faulty Metal Detector Coils.
Most pusle induction coils for the Minelab series of detectors are built the same. The problems are common to all coils. http://detectormods.com
World War II Metal Detecting - German Pistols - Eastern Front Battlefield Relic Hunting (HD)
Team WWIIMD visited last december the former battlefields of the eastern front, where heavy fighting took place in 1945. In the search for war relics we discovered some amazing finds that we will share in our new battlefield research video. Our most interesting find was a German MG34/42 machinegun ammunition box that containd 2 German pistols. Czech CZ 27 and a Belgium FN 1922, both war time productions. We also found equipment pieces and other interesting things that were left behind in the woods after the war. Feel free to leave a comment. Greetings from Holland! TEAM WWIIMD - Word War II Metal Detecting Videos firstname.lastname@example.org
Delta pulse2 ve metal ayrım devresi
Metal Cinslerini ekranda bar ve LED ile gösteren, tüm Delta Pulse ve XR71 devrelerinize rahatlıkla bağlayabileceğiniz LCD ayrım devremiz siparişler alınmaya başlanmıştır. Videoda LCD devresi XR71'e bağlanarak metaller hakkında fikir verebilen bir cihaz elde edilmiştir. This circuit developed for metal discrimination for xr71 and delta pulse metal detectors. You can connec your own delta pulse or xr71
Homemade Metal Detector
This metal detector use the VLF technology (Very Low Frequency, in this case 4.7kHz). The documentation is free, but it is available only in Hungarian. Webpage: http://www.metaldetector.hu/ Doc: http://www.freeweb.hu/femkereso/silverstar1.doc SCH: http://www.freeweb.hu/femkereso/silverstar1arajz.png PCB: http://www.freeweb.hu/femkereso/ss1apanel.zip
Metal Detecting DIY: make your own coil part I
http://www.adventureswithjim.com Make your own coil for your metal detector! Sure, you could always BUY a new coil, but what if the size or type you want isn't made for your model...then what? Coil building is a fun way to not just expand the possibilities of your machine, but to get a deeper understanding of why things do what they do. And oh yeah....disclaimers...not responsible for you fucking up your machine! Read though and carefully test everything before plugging in a DIY coil!!
Handheld BFO metal detector made of glue stick (딱풀 금속탐지기)
This is Handheld BFO metal detector. easy build, simple, but useful. schematic from http://www.easytreasure.co.uk/bfo.htm 딱풀통으로 만든 금속탐지기 입니다. BFO 방식이며 비교적 만들기가 간단합니다.
World War II Metal Detecting - A Weapon Treasure - Eastern Front Relic Hunting Episode 9 HD
Metaldetecting WW2 Episode 9. Hello dear friends! This is a video of our last tour this year. It's not really a tour like the other ones we've been on, this one was just a one-day-tour actually. But even though it was a short tour, it was our best tour ever. We found a weapon dump pit with a total of 6 weapons in it, plus a lot of magazines in really amazing condition. We found the long awaited MP40, plus 4 Degtyaryova Tankovy (DT) machine guns, which are quite rare relics to be found with a metal detector.. It was really a find of a lifetime and we invite you to take the tour together with us in this video. Our advice: don't skip the video, just sit back and enjoy :) Feel free to post comments or ask questions. Enjoy the video! Dear viewers, we've received a few questions/comments/critical notes about how some of the finds in this video were dug up. Some people think the digging is a bit too rough, and for that reason here's a short statement from our side: We can assure you that none of the things we've found are damaged in any way. I would dare to bet anything on that. But without being overdramatic, we take our time, we always dig carefully, remove every root/stone/whatever that's in the way, before pulling even a little. Damaging historical relics is a terrible shame and the worst thing that can happen in our opinion. Machineguns like the DT are made of very, very solid steel and they will never be damaged the way we dig. For other finds we often use toothbrushes, but in this case that's just a ridiculous thing to do. Again, we totally get your point of view, but please, please keep in mind that it's just really hard to judge this sort of thing from your desk, especially if you have no experience with digging solid guns or whatsoever. :) Thanks again for watching. Good night. A hunt with Boddeus and Lean, visit his Boddeus' relichunting channel https://www.youtube.com/user/boddeus and Lean's channel https://www.youtube.com/user/emmuh0uttt Note: I do not own the music used in the video, nor will I make money with it! If you enjoyed watching this video, please take the time to comment, rate, or even click subscribe to be the first to watch our next videos :) Our equipment: XP Gmaxx II XP Gmaxx II XP Gmaxx II White's Matrix M6 White's TM-808 Canon Powershot A1200 Kodak ZX5 Playsport GoPro Headcam 2x Panasonic HC V510 WWII Metal detecting videos.
How Its Made 06 Metal Detectors
How to make a Metal Detector
The basic BFO employs two radio frequency (RF) oscillators which are tuned to very nearly the same frequency. The frequency of each oscillator is usually determined by an L-C resonant circuit, that is, an inductor and a capacitor. One is called the search oscillator and uses the search coil as its inductor; the other is called the reference oscillator and uses an internal inductor. The outputs of the two oscillators are fed into a mixer which produces a signal that contains the sum and difference frequency components (plus otherintermodulation components) of the two input signals. As we will see shortly, the difference frequency is what we are interested in, and a low-pass filter at the output of the mixer will remove the other components. Note: No responsibility accepted due to injury or damage that may be caused in building or using this Metal Detector.
How I repaired a Coiltek Goldstalker Coil
How I repaired my Golstalker 18.5" Eliptical Mono
primeras pruebas del quadrotor volando... otro video
4073 Metal Detector $13
Affordable metal detector can easily find coins and other valuables.Perfect for locating nails in wood, survey spikes, pipes and more Three-way metal finder has three separate audio signals for different metals Built-in battery tester Other functions include ferrous metal indicator, tune adjuster, one-touch auto-tone, volume control Reg. $27
Searching for Ancient Coins in Belgium
AT Pro International and AT Gold used to recover early hammered coins, Roman bronze coins and other finds in plowed fields of Belgium. For more information and videos about the AT Pro International and AT Gold visit http://www.garrett.com
simple beat-frequency oscillator (BFO) metal detector
The most basic way to detect metal uses a technology called beat-frequency oscillator (BFO). In a BFO system, there are two coils of wire. One large coil is in the search head, and a smaller coil is located inside the control box. Each coil is connected to an oscillator that generates thousands of pulses of current per second. The frequency of these pulses is slightly offset between the two coils. As the pulses travel through each coil, the coil generates radio waves. A tiny receiver within the control box picks up the radio waves and creates an audible series of tones (beats) based on the difference between the frequencies. If the coil in the search head passes over a metal object, the magnetic field caused by the current flowing through the coil creates a magnetic field around the object. The object's magnetic field interferes with the frequency of the radio waves generated by the search-head coil. As the frequency deviates from the frequency of the coil in the control box, the audible beats change in duration and tone. Bill of materials, diagram and additional details in the ''Home Made - Simple Metal Detector "Beat Frequency Oscillator" video here: http://www.youtube.com/watch?v=UcFS8nteQvw
How to make a Metal Detector with household items
REALLY cool way to make a metal detector. Who would of thought? RazorG Productions
Magnetic Flux & Metal Detector on the iPhone
** NOW AVAILABLE IN THE APP STORE AT http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=321813152&mt=8 ** Thanks to the built-in compass in the iPhone 3GS, it is now possible to turn your iPhone into a magnetic field and metal detector. With this video, you can get a sneak peek of our new iPhone application that detects items such as keys, money, and personal electronics with the traditional sounds and display of a metal detector. It can also be used as a theremin (the instrument popularised by the Doctor Who theme) if you have a fridge magnet or two handy! Magnetic Flux & Metal Detector will be available on the App Store shortly. You can find out more details at http://philandben.com/
IMPRESIONANTE!!!!! TESORO DE BARRAS DE ORO ENCONTRADAS CON MI DETECTOR DE METALES
http://www.maquinaria.cl EQUIPOS DETECTORES Fono 56 9 94120078