Low Noise Front End for P.I.

[Bill512]

ok Max, you are right.
so tell us a (relative) easy way to go down on 1.5 meters or more, looking for 70 Kg of gold, even within a magnetic box.
Maybe you know a simple way to make a 2 meter coil for VLF and carry it on mountains ...
PI big coils are just a bunch of cables on a bag and some sticks.
Yes, it should be better to use (for this type of treasure hunting) some kind of geomagnetic tools.
let's see...
PROTON MAG (5000-6000$)
GEM-2 42000$
PROFILER (GSSI) 28000$
"Hi-tech" DSP PI (5000-6500$)
price list on my country, Greece
(here the White's DFX cost's 3400$ (!!!))
My choice is Delta pulse for about 100-200$

[Max]

ok Max, you are right.
so tell us a (relative) easy way to go down on 1.5 meters or more, looking for 70 Kg of gold, even within a magnetic box.
Maybe you know a simple way to make a 2 meter coil for VLF and carry it on mountains ...
PI big coils are just a bunch of cables on a bag and some sticks.
Yes, it should be better to use (for this type of treasure hunting) some kind of geomagnetic tools.
let's see...
PROTON MAG (5000-6000$)
GEM-2 42000$
PROFILER (GSSI) 28000$
"Hi-tech" DSP PI (5000-6500$)
price list on my country, Greece
(here the White's DFX cost's 3400$ (!!!))
My choice is Delta pulse for about 100-200$

Hi,
ok... now we can think at your data: 70Kg of gold are nice stuff and PI will be good for that depth, though will not give you 100% coverage if mass is concentrated in few surface... gold is really heavy and a few bars make actually 70Kg pretty fast. So you'll probably miss the target also with an overpriced PI this way, unless some large e.g. iron stuff is just above or around gold stuff (like a big box).

Now about mags... you can make also some fluxgate, Carl posted a project about that uses two simple and easy fluxgate sensors , cost is about ridiculous compared with commercial mags...or you can also think at PPM but will be tricky if you have no experience building one already.

Delta is a good option but then why you need the 3 op amps... and ultra low noise stuff... ???
Make it as is. If you are lucky you'll find the treasure, no need of extra mods.

But better having both, PI and mag in this kind of search.

Remember , I answered you about VLF advantages cause when I see ultra low noise op amp I automatically think at inland use of PI on small targets like coins not gold bars and disc ability issues.

Kind regards,
Max

[Bill512]

Remember , I answered you about VLF advantages cause when I see ultra low noise op amp I automatically think at inland use of PI on small targets like coins not gold bars and disc ability issues.


Max

Max, now you are right!!!
I do not intend to make a complicated front end, but just i want to experiment in a more easy way( better op-amps, timings,Fet...)
Unfortunately,even if we have a low front end, there is a limit. The useful signal from targets decreases rapidly according to distance (reverse 6th power)
Maybe a "low noise front end" and a different approach to TX signal?
Now about MAG's, i think the proton mag project by Willy Bayot is good choice.

regards

[Unregistered]

Still pike here ?

So take this...

I don't understand why you guys have that battles with PIs that are well known to be so bad on real inland conditions... this surprise me much more than 3 op amps and resistance splitting!

Kind regards,
Max

Pike here
As the password recovery/reset mail comes late after expiry, after 24 hours, I couldnt get the password, if PI's are bad whats the best detector then We need an voting on this issue from experts like sean Goddard etc etc, even for any detector the noise specs are to be considered as we have to measure few micro volts

[Max]

Pike here
As the password recovery/reset mail comes late after expiry, after 24 hours, I couldnt get the password, if PI's are bad whats the best detector then We need an voting on this issue from experts like sean Goddard etc etc, even for any detector the noise specs are to be considered as we have to measure few micro volts

Hi,
I never said PIs are bad...as a whole and everytime... I told they are on "real inland" conditions...

If you plan to use them at beach they are very good... if you plan to search for very deep stuff on inland too they are good... where they fail absolutely is finding e.g. coins in inland sites.

I found small objects with PIs on inland too... some brass, some copper but most of the times iron and aluminium make me crazy there... and not a case: PIs are extremely sensisitive to both iron and aluminium stuff, including cigarette metallized paper and all the trash that exist in this world today, inlcuding also brick, ceramics, pottery ...whatever has magnetic dipoles inside. So , unless you live on the Moon, I think you'll not find the good stuff this way.

The few times I need deep search stuff for finding e.g. a pipe buried under meters of soil I use PIs!

So, the thing is... from my perspective, considering inland search, PIs are bad.

My vote about MDs ? Sure is for VLFs, though not as powerful as PIs are, they really discriminate stuff... I save time, I save work, I save also myself from being ridiculized by other THs that find stuff... not just nails! And got the stuff!

Best MDs for TH? Are those that make you find the good stuff and let there the trash or ,at least, the big part of crap.

About meters detection... not possible for VLF cause of their limitations... but it's tradeoff of winners: the VLFs win most of the times... but are somehow specialized in some kind of searches and not others.

You can use a PI even underwater... but then ? Do you plan finding some old steel closet someone dropped there from a boat ? Rare that you find good stuff this way... unless you know there's something GOOD ship wreck...

Just my point of view...

Kind regards,
Max

[Unregistered]

Pike Here

Hi,
I never said PIs are bad...as a whole and everytime... I told they are on "real inland" conditions...

About meters detection... not possible for VLF cause of their limitations... but it's tradeoff of winners: the VLFs win most of the times... but are somehow specialized in some kind of searches and not others.

Kind regards,
Max

Pike here
Whats the depth of VLF and whats the best vlf here in geotech forums without schematic and pcb error. I have to make one with out errors.

regards

[Max]

Pike here
Whats the depth of VLF and whats the best vlf here in geotech forums without schematic and pcb error. I have to make one with out errors.

regards

pike here... there aren't good VLFs without any errors on pcb ...but you can try with TGS, few errors about components value on silkscreen, you replace right values there and that's known to offer very good performances once tuned.

Kind regards,
Max

[Great_Alex]

Hi Bill

the best detector for your reason a gol bar in 1.5 meters is minelab GP4000 with at least 18" coil ,24" is excellent