Originally posted by habitbraker
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Originally posted by dfbowers View PostHello Ivconic!
Nice to hear from you. Very nice design. The feature that interests are the dual channels, much like the Nautilus by Tyndall.
One strong feature of the Nautilus line is one that might not be obvious right away, and I would be interested in hearing from you if you notice this same behavior.
With the Nautilus, you have two channels, one AM and the other DISC. The Nautilus has no target ID but the user can get a general indication of conductivity by listening to the intensity and timing of both signals.
For example, if the disc channel is louder and rings in about the same time as the AM channel, then it is likely a high conductor. If the AM channel is louder and rings in slightly before the DISC channel, then it is likely a low conductor.
ALSO, it is much more difficult to be fooled by large iron with this machine because the AM channel will come in "booming" and long before the DISC channel.
While the TGSL does not have any modulation to the signal intensity, you may still notice a difference in the timing of both signals, which may be useful!
Now I realize from reading your post that the IGSL is sort of a "reverse" from this, but still might be a useful feature if you can tune yours this way.
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Originally posted by Wiltran View PostHi Ivconic, your posts are always interesting and informative! This new design looks promising. Would it be helpful in i.d. of steel bottlecaps? Would additional controls make it additionally confusing to operate in the field?
So.. there will be only 4 knobs on front panel.
I was thinking how to name those controls. Their internal functions are pretty clear.. but i had troubles how to name those to be closest to common operators logic and mentality.
So it better be left to each operator personally to choose most suitable name for that control.
My offer is: Disc Sens and Iron Sens for sensitivity controls and Disc for disc knob at first block.... but how to name second disc at second block? How to name it shortly? Most suitable name would be as on schematic - Nonferrous rejection level. But it is to long name to be placed on small front panel.
Aside that; i don't think that there are to much controls, only 4 and all are straightforward and easy to understand.
Various combinations of those 4 controls is quite another story. It will need a bit of experimenting and practice to establish most desirable setup for certain given condition. It is up to operator to establish that and choose what suits his needs at that exact moment.
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Re IGSL, consider:
Each channel is really half a notch.
The normal channel rejects everything below the level, accepts above.
So it is a notch that is missing the top cutoff control.
The "iron" channel, if I understand correctly, rejects everything above the disc level.
So it is a notch that is missing the bottom cutoff control.
I think a design that would be clear to the user would be to have two identical full "notch" channels. Each channel simply makes a different tone. The labeling would be same except labeled channel1, channel2.
There would be no confusion -- just set the notch for each channel. You can always set the bottom or top cutoff to max or min to get conventional discrimination.
It would also allow you to hear different tones for gold and silver for example if you wanted.
Of course it means even more channels -- two entire TGS circuits!Lots of parts.
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Ok, how about this --
Back to the IGSL -
Why not make it (or interpret it) as a single channel notch machine with a special twist. When the notch is in "reject" mode, the targets below the notch have one tone, and the targets above the notch have a different tone.
With Ivconic's circuit, the notch levels can overlap (i.e. crossover) -- but is that necessary??? Maybe useful, not sure.
Users are probably familiar with concept of notch and use of pots.
So in IGSL as currently designed, DISC1 knob is "upper notch level", DISC2 knob (non-ferrous reject) is "lower notch level", and the mode is always "reject".
Just another way to look at it.
-SB
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Originally posted by Great_Alex View PostHi Ivica
Welcome Back
please give information about a good performance coil for this MD.
as you mentioned above like TGSL but write it again caus ein TGSL many every people suggest a different coil !
coil diameters , number of turns and wire thickness , resistance ...
best regards
http://www.geotech1.com/forums/showthread.php?t=15710
Others might be gained good results with different coil data, i can't tell. I always make one and the same coil with same data: 6mH and 6.5mH. TGS/TGSL can be pretty tolerant on coil inductances, so those can vary from 5.8mH to 6.1mH for TX and 6.3mH to 6.6mH for RX. More important is coil balancing, shielding and wiring. Already everything described, so many times in the past.
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Welcome back
Ivconic
I would like to take the opportunity to thank you for the time and effort you put on this great forum.
you give me countless hours of pleasure reading your posts and fallowing your detailed instructions.
I hope you change your mind and stay. there are allot of people that we will love such a decision.
I wish all the best for the future.
kind regards
Nickel_n
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