One good example is Gary's very own “Pulse Inductive Metal Detector”. IC4 has a gain of ~1750, the diodes limit the output to 1V. Since I am able to build one for myself and used it in our various treasure hunting projects with some good results, I am confident enough to say that ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.jeffvoegtlin.com/73a448/voaieut.php%3Fnil%3Dsqbcdskdsdpulsehyojinductionhyojmetalhyojdetectorhyojcircuit&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNHOZfqK_Jzc-MLA4PRK2eqhEuBgXw
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