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VLF or Very Low Frequency Metal Detectors

VLF or Very Low Frequency Metal Detectors `
Inside the metal detector’s loop (sometimes called a search head, coil, antenna, etc.) is a coil of wire called the transmit coil. Electronic current is driven through the coil to create an electromagnetic field. The direction of the current flow is reversed several thousand times every second; the transmit frequency “operating frequency” refers to the number of times per second that the current flow goes from clockwise to counter...   Continue reading »»»
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BFO or Beat Frequency Oscillator Metal Detectors

BFO or Beat Frequency Oscillator Metal Detectors `
BFO “Beat Frequency Oscillator” metal detectors are about the most basic of all metal detector technologies, in fact one can build one of these type metal detectors with relative ease. Because of the simplicity of BFO metal detectors they are relatively cheap. One can easily purchase a BFO hobby type metal detector for $25 to about $200. Don’t be fooled by the simplicity of this technology though BFO metal detectors...   Continue reading »»»

P.I. or Pulse Induction Metal Detectors

P.I. or Pulse Induction Metal Detectors `
PI “Pulse Induction” metal detectors are a less common type of metal detector that have found their home mostly among hobbyists. PI metal detectors work well in the water, on beaches and in gold fields. Many hobbyists swear by pulse PI technology. Pi metal detectors are definitely in a class of their own! How Pulse Induction Works PI “Pulse Induction” metal detectors can work by using one coil working solo or by...   Continue reading »»»
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