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Here is what a fellow named Mark said in regard to the AquaSound and the Nautilus 2B builder Jerry Tyndall:
The Aquasound is used by the Bulgarian, not built by him. The 20" (depth) they are talking about is the depth on a quarter. This is in non-mineralized sand, free of any blacksand. A person just learning the Aquasound would have a difficult time getting 20" deep, because the audio is very weak at those depths. It uses the TR side of the circuit board design that is in the Nautilus DMC 2B. Jerry Tyndall had a lot of input in working out the bugs so it would work to its best potential in saltwater areas of South FL. Its best attribute for hunters in S. FL. was its ability to ignore rusty bottlecaps or other iron type targets. On iron it gives you a drop in the threshold, but because of the automatic retune you get a sort of boing sound when the threshold returns. While any other non-ferrous metal will give you a sharp increase in the threshold, with the loudness of the signal dependant on how deep the target is. A good target sounds similar to a vlf detector being run with a threshold in all metal. I know the builder of the Aquasound, and have seen his log of gold finds found over the years since the development of the Aquasound. Most people would say I am lying if I tried to give a estimate of all the gold and other items he has found. So, I wont bother. If anyone has been hunting back when the TR detectors were the only game in town, they understand why a TR detector is not a very good choice if you are hunting mineralized ground. But in some cases such as S. FL. and other beaches that are non-mineralized a high powered TR detector like the Aquasound can produce some amazeing depths. Comparable to some PI detectors, but you have the ability to not dig iron with the Aquasound. Thought I would throw this out there for anyone who wants to learn a little bit about this detector, without all the conjecture of people that haven't used this detector.
Mark
The Aquasound is used by the Bulgarian, not built by him. The 20" (depth) they are talking about is the depth on a quarter. This is in non-mineralized sand, free of any blacksand. A person just learning the Aquasound would have a difficult time getting 20" deep, because the audio is very weak at those depths. It uses the TR side of the circuit board design that is in the Nautilus DMC 2B. Jerry Tyndall had a lot of input in working out the bugs so it would work to its best potential in saltwater areas of South FL. Its best attribute for hunters in S. FL. was its ability to ignore rusty bottlecaps or other iron type targets. On iron it gives you a drop in the threshold, but because of the automatic retune you get a sort of boing sound when the threshold returns. While any other non-ferrous metal will give you a sharp increase in the threshold, with the loudness of the signal dependant on how deep the target is. A good target sounds similar to a vlf detector being run with a threshold in all metal. I know the builder of the Aquasound, and have seen his log of gold finds found over the years since the development of the Aquasound. Most people would say I am lying if I tried to give a estimate of all the gold and other items he has found. So, I wont bother. If anyone has been hunting back when the TR detectors were the only game in town, they understand why a TR detector is not a very good choice if you are hunting mineralized ground. But in some cases such as S. FL. and other beaches that are non-mineralized a high powered TR detector like the Aquasound can produce some amazeing depths. Comparable to some PI detectors, but you have the ability to not dig iron with the Aquasound. Thought I would throw this out there for anyone who wants to learn a little bit about this detector, without all the conjecture of people that haven't used this detector.
Mark
There is nothing hidden in the question as to what is the meaning of life 
, all I as asking is if you whack a multimeter across that 10 volt line and wave an object across the coil to load the circuit and draw some current does the voltage stay stable. IE not bounce. I have a use for such a simple circuit.
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