I guess what I am trying to say is that it appears to me that all these types of devices operate on the same principles of physics with slightly different variations of application.
The one common denominator that I have observed is that 18 years of residual effects of Solar magnetic activity greatly affects the operation of all these devices, as well as Magnetometer, and to a lesser degree the depth penetration of conventional metal detectors.
The conditions when these electronic, or non-electronic devices will work, or will not work, has been consistently predictable whether I am using electronic metering, or a pair of Dowsing rods to meter the Strength of Field (SOF) suffecient for these devices to operate.
To put it bluntly, there are magnetic conditions and fluxuations in which none of these devices will function effeciently, or will even work. This can be a problem with testing your design.
I was using the Mineoro, as an example because you were speaking of an Ion detector, which is the scientific principle the Mineoro, claims to be using.
I have never field tested the posted schematic, but If this schematic is indeed intended as a Gold discriminating Ion detector, and comparing it with the Mineoro field results, I suspect it will be affected by the same limitations as all other LRL remote sensing devices, whether electronic, or non-electronic.
Not that I personally care, but I'm trying to be helpful by suggesting it as a consideration in your modifications of componnents to be included in the schematic.
I probably am intruding in the electronic engineering, which admittedly I know nothing about. Sorry! I mean no offense. I'll stay out of it, unless asked. Dell
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