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There seems to be a serious deficiency in the way these detectors handle a deep target or even a small target if at depth. It is very common on a deep target to lose threshold as you swing over a deep target. What I mean is that the detector just goes quiet. Most people would ignore such a response and continue on. A few professional prospectors here in Victoria know of this detector anomaly and dig these targets, in most cases large Gold Nuggets have been retrieved.
I have 2 cures, one is that I mod the detector so that it gives an audible response on this threshold drop. That is it give a tonal response.
The other cure is unconventional but it involves turning the threshold full on and adjusting the volume to give a small background tone. Ground response is then adjusted with the signal control. The threshold circuit limits the drive to the output stage as it utilises a resistive divider, having it flat out matches the VCO control voltage output and this match gives a clear tonal response on both small and large deep targets.
Try it and stop walking over Gold!
I have 2 cures, one is that I mod the detector so that it gives an audible response on this threshold drop. That is it give a tonal response.
The other cure is unconventional but it involves turning the threshold full on and adjusting the volume to give a small background tone. Ground response is then adjusted with the signal control. The threshold circuit limits the drive to the output stage as it utilises a resistive divider, having it flat out matches the VCO control voltage output and this match gives a clear tonal response on both small and large deep targets.
Try it and stop walking over Gold!