The metal detector presented may represent a new category in its field. After some exposure, it has been recognized as such by those familiar with it. This device is based on a standard transformer coupled oscillator (TCO), which is why it is referred to as a Coil Coupled Operation (CCO) Metal Detector. While it requires a Beat Frequency Oscillator (BFO) — in this case supplied by a Medium Wave radio — its performance significantly surpasses that of typical BFO detectors. Additionally, it relies on the balance of two coils to enhance sensitivity, distinguishing it from Induction Balance (IB) detectors, which utilize a passive receiver section. Furthermore, this design does not necessitate precise coil placement, unlike IB detectors. Similar to both BFO and IB designs, this metal detector offers discrimination capabilities. Experiments with various implementations of this concept indicate that it has the potential to rival the best IB detectors.
The Coil Coupled Operation (CCO) Metal Detector utilizes a transformer coupled oscillator (TCO) configuration, which is integral to its functionality. The TCO consists of a primary coil and a secondary coil, where the interaction between these coils generates an oscillating signal. This signal is modulated by the presence of metallic objects in proximity to the coils, allowing for detection.
The device's reliance on a Beat Frequency Oscillator (BFO) sourced from a Medium Wave radio enhances its detection capabilities, enabling it to operate effectively across various environments. The sensitivity of the detector is significantly improved through the careful balancing of the two coils, which is crucial for distinguishing between different types of metals and minimizing false positives.
Unlike traditional Induction Balance (IB) detectors, which employ passive components, the CCO design incorporates an active receiver section within the oscillator. This active configuration allows for better signal amplification and processing, resulting in superior detection performance. Additionally, the flexible coil placement in the CCO design simplifies the setup process, making it more user-friendly than its IB counterparts.
In terms of discrimination, the CCO Metal Detector is equipped to differentiate between various metal types, which is essential for treasure hunters and archaeologists seeking specific targets. The results from experimental iterations of this design suggest that it can achieve performance levels comparable to the most advanced IB detectors available on the market, thus marking a significant advancement in metal detection technology.The metal detector shown here may well represent a new genre. At any rate, after some exposure, it is regarded as such by those who have seen it. It is based on a standard transformer coupled oscillator(TCO) - hence the name Coil Coupled Operation (CCO) Metal Detector. Although requiring a BFO (in this case provided by a Medium Wave radio), it dif fers from a typical BFO detector in that its performance far outstrips that of BFO. Also, unlike BFO, it is dependent on the balance of two coils to boostsensitivity. It also differs from IB, in that its Rx section is an active, rather than passive, component of the oscillator. Further, unlike IB, the design does not require critical placement of thecoils. As with both BFO and IB, the design provides discrimination. Experiments with different embodiments of the idea have shown that it has the potential to match the best of IB.
The circuit consists of two oscillators, both working at about 465 kHz. One uses an if transformer and the other uses an inductor (the search coil LI). The oscillators are coupled by a capacitor (10 pF). A beat note...
This design has not been referred to as a GOLD detector, as that term is reserved for more complex devices capable of distinguishing gold from other metals. There is a significant difference between detecting gold and ordinary metals, known...
As you can see, there is only one regulated 12 volt supply operating the entire circuit. This allowed me to adjust the offset within an operating window. By using a tantalum capacitor of reasonably high capacity, the signal passes...
The device being constructed will serve as a metal detector, capable of locating metal objects such as coins, nails, and keys, including car keys that may be misplaced. It can also detect gold, although it may not possess industrial...
This is a single gain-of-100 amplifier with a gain-bandwidth product of 20 MHz. The primary limitation in performance is the low slew rate of 0.3 V/μs imposed by the charging of Ccomp. The effects of slew rate and compensation...
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...
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