• "TR" originally referred to the coil design as well, though most people apply it to detectors which have separate transmit & receive circuitry (unlike the BFO, which did not). Back in the 70's when VLF emerged, it was a shift from high frequency (100kHz) to the VLF range (5kHz) with the addition of ground balance.
  • Pulse Induction (PI) Detectors In contrast to the VLF detector’s two-coil design, Pulse induction (PI) metal detectors have just a single coil. This one coil transits the magnetic field and detects...
  • Pulse Induction metal detectors or PI detectors can reach far greater depths than VLF metal detectors, but each type of detector is designed for a specific activity. View all products Coils for VLF metal detectors
  • Oct 31, 2016 · The basic working principles of metal detectors are based on electromagnetic induction. Metal detectors work by interacting with metallic elements on the ground through one or more inductor coils that are attached to them.
  • The original induction balance coil system consisted of two identical coils placed on top of one another. Compass Electronics produced a new design: two coils in a D shape, mounted back-to-back to form a circle. This system was widely used in the 1970s, and both concentric and D type (or widescan as they became known) had their fans.
  • What's great about this metal detector design is that you need a 5V battery to power it, and it doesn't require so many components in contrast to other plans. Just an Arduino microcontroller, a capacitor, resistors, diodes, a metal detector coil, LED lights, and a speaker. If you wish, you can also add headphones so that you can hear the ...
  • - Induction Balance (IB) - Very Low Frequency (VLF) - SuperB Depth = Super BLISSTOOL Depth (SBD) new - One of the best deep detecting metal detectors in the world - Base operating frequency: v1 - 8.5KHz; v2, v2i and v3 - 8.0KHz, v4, v5 and v6 - 8.0KHz and 7.4KHz new - Adjustable operating frequency (+-60Hz) new - Operating mode: motion
  • Nexus Standard MKII is a non-motion type of detector with fast auto tune, with an induction balance resonant tuned (99%) search coil. It's general performance is similar to the motion type of metal detectors. It exhibits the best possible depth penetration and discrimination accuracy that modern electronics can achieve.

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The inductor of the above tank circuit forms the detector of the metal detector (a large coil of wire). When metallic material approaches the center of the inductor (the detector coil), it enters the magnetic field created by the inductor. This changes the magnetic permeability of the inductor’s core, causing the inductance to change. The ...
The New Teknetics G2 is unique among gold prospecting metal detectors for its combination of high sensitivity to small gold nuggets and its versatile function as an all-purpose treasure detector. The controls and features are tailored to gold prospecting, including a sophisticated ground balancing system, separate control over signal gain and ...

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In it's simplest terms, IB (induction balance) is a precise term referring to a constant field method of energizing a field between a primary and secondary (transmit and receive) coil. That's opposed to a method of sending a pulse, then letting the field collapse and listening for a response (PI).
DETECH “CHASER” VLF METAL DETECTOR $ 869.00 $ 779.00 Add to cart; Detech 11″ Mono closed design gold coil $ 280.00 Add to cart; Detech 11″ Ultra Sensing Mono coil $ 379.00 Add to cart; Detech 11×6″ Mono Boomerang closed design gold coil $ 275.00 Add to cart; Detech 12.5″ DD closed design gold coil $ 300.00 Add to cart; Detech 12.5 ...

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13kHz VLF (Very Low Frequency) Induction Balance. STRUCTURE. Fast Release Camlock 3 Sections Straight Rods Extendable From 80CM to 130CM. BATTERY TYPE. Built-in Rechargeable 2000mAh Li-Po Battery. DETECTION COIL. International 9×5? TurboD Waterproof Coil. US market 11×9? TurboD Waterproof Coil. PROGRAMS. 6 Searching Programs. AUDIO OUTPUT
Dec 13, 2020 · NATIONAL GEOGRAPHIC: Check the current price Fisher F22 Weatherproof Metal Detector with Submersible Search Coil – Great for Intermediate Users. This metal detector offers slightly more advanced controls, along with a more basic but intuitive display, producing an excellent metal detector for intermediate users.