A Metal Detector Technology Question
In addition to nugget hunting I am also a history buff and I would like to learn more about metal detector technology, its history and sequence of development. I understand that the BFO (Beat Frequency Oscillator) technology was used in the very early metal detectors. Right now I would like to learn what is the difference between TR (transmitter receiver), induction balance, and VLF technologies and when was each one introduced to the market. Is there anywhere where I can find a list of man
https://www.icmj.com/magazine/article/detectors-past-present-and-future-3466/
https://www.detectorprospector.com/magazine/steves-reviews/metal-detector-technical-specification-notes/
https://www.detectorprospector.com/forums/topic/1424-vlf-detectors-and-depth/
https://www.detectorprospector.com/forums/topic/3193-selectable-frequency-and-multiple-frequency/
https://www.treasurelinx.com/home1.html
https://www.detectorprospector.com/magazine/steves-guides/steves-guides/