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Beat Balance Metal Detector - BFO (beat frequency oscillator) metal detectors use two oscillators, each of which produces a radio frequency. One of these oscillators uses a coil of wire that we call the search loop. The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the reference oscillator. By adjusting the oscillators so their frequencies are very nearly the same, the difference between them is made audible as a beat note __ Designed by Essex Metal Detectors
Beat Balance Metal Detector (Rev Thomas Scarborough) - Various embodiments of the BB metal detector have been published, and it has been widely described in the press as a new genre. instead of using a search and a reference oscillator as with BFO, or Tx and Rx coils as with IB, it uses two transmitters or search oscillators with IB-style coil overlap. The frequencies of the two oscillators are then mixed in similar fashion to BFO, to produce __ Designed by Andy Collison
BFO Metal Detector - Not the best, but Simple, and Now with a PCB. __ Designed by G.L. Chemelec
CCO Metal Detector - To the best of the author's knowledge, the metal detector shown here represents another new genre. it is presented here merely as an experimental idea, and operates in conjunction with a Medium Wave radio. Elektor Magazine. __ Designed by Published in issue 345, July 2005
CCO Metal Detector - A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector. __ Designed by © Rev. Thomas Scarborough
Coil Coupled Operation Metal Detector - A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector. __ Designed by © Rev. Thomas Scarborough
Construction metal imager - 05/15/14 EDN Design Ideas: Build up an image of inductively sensed, hidden metal using the software equivalent of a long time exposure! My design proposal is to use the LDC1000 to build a metal sensing imager for home and office construction. My first idea was switching an array of coils and controlling an indicating LED for each. The cost of even an eight-by-eight array was prohibitive, and would not give a satisfying image. The second idea was to use a solenoid to activate a marker which would travel through the coil center and mark the surface wherever metal was detected. Again, cost would be prohibitive, and while satisfactory on a construction site, a homeowner might object to having their walls marked up. Design by George Mallard
DIY BFO metal Detector - BFO (beat frequency oscillator) metal detectors use two oscillators, each of which produces a radio frequency. One of these oscillators uses a coil of wire that we call the search loop. The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the reference oscillator. By adjusting the oscillators so their frequencies are very nearly the same, the difference between them is made audible as a beat note __ Designed by Essex Metal Detectors
FET based metal Detector using MPF102 / J310 BF998 FETs - Making a metal detector was always my dream. I was curious listening to those beeps at airport for which dad explained that they were metal detectors. Which did not mean anything to me. Last summer I had opportunity to find secrets behind this little stuff from my dad which turnout to be simple project one can make at home. __ Designed by Nina Gajjar
Fortune Finder - Searching for buried treasure can be a rewarding experience - try out this metal locator next time you go prospecting or beach combing__ SiliconChip
GoldPIC 3 Pulse Induction Metal Detector (has electronic kit available) - GoldPIC 3 is a 'Build it Yourself' pulse induction metal detector design __ Designed by Trevor R. Hill
Hand-Held Metal Locator - ideal for finding steel frames and studs, steel bracing and nails in plaster walls, this Metal Locator can also show the length of the tang in knife handles, screwdrivers and other tools. As well, it can discriminate between ferrous and non-ferrous metals.__ SiliconChip
Heathkit Groundtrack GR-1290 VLF metal Detector - Schematic Only, no circuit description__ hobbyteam @ hobby-hour.com
Home Made Metal Detector - This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability. it is not suitable for buried coins discovery that is not sensitive enough but you can detect pirates treasures! The metal detector is powered by 2 × 9V batteries, each of it charges with 15mA. L1 detector__
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