making good detector

[no one]

Hi Max,Ivconic and others...
I have built tgs,tgsl,tgsl 1265 and more than 10 coils for them.
my coils data were same as ivconic send here.27cm former,tx=100,...
my devices were good at many test point that i check.
coils were nulled at least as i can and in various way.at
output lf353,directly to multimeter,with cap and res parallel and...
after assembling all them no more than 25cm in air test for a 2.5cm coin.
with all devices and all coils same.
i need to build a good vlf in depth and disc for coin...more than 35cm dpth.
please help me to make good one.
max...how is your bandido performance?for a 2.5cm coin?
do you used original component or...?
i want make one.(bandido)
if any other detector is in your mind that be good in depth and disc
please inform me.(its name its schematic coil data and its performace.)
i wish the best for you.

[Max]

Hi Max,Ivconic and others...
I have built tgs,tgsl,tgsl 1265 and more than 10 coils for them.
my coils data were same as ivconic send here.27cm former,tx=100,...
my devices were good at many test point that i check.
coils were nulled at least as i can and in various way.at
output lf353,directly to multimeter,with cap and res parallel and...
after assembling all them no more than 25cm in air test for a 2.5cm coin.
with all devices and all coils same.
i need to build a good vlf in depth and disc for coin...more than 35cm dpth.
please help me to make good one.
max...how is your bandido performance?for a 2.5cm coin?
do you used original component or...?
i want make one.(bandido)
if any other detector is in your mind that be good in depth and disc
please inform me.(its name its schematic coil data and its performace.)
i wish the best for you.

Hi,
it's not easy... getting the best from TGS, expecially if something is wrong at coil. Now, assuming you made coils the good way like described the problem is maybe somewhere else: in the circuit.

The TGS schematic, so also the TGSL, suffers from components selection variances... you find good components and it works superb in bench tests and reasonably very well on soil... just reduce a bit sensitivity to gain perfect stability when ground balanced.

If the circuit is the problem... then maybe some component is involved: e.g. first schematic used some old pieces like TL062... you must avoid them , are pesty things... noisy... better an e.g. 27M7 there or also a 27M2 or similar stuff... even a TL072 could radically change behaviour from using TL062.

Just an example... there are tons I can made but you only can check your circuit and look for noise sources and troubles...just follow the advices and you'll probably find a solution.

Now... I have to say that a coin at 35cm is possible for TGS, buried in ground, to detect but requires top tuning and lot of tweaking at e.g. coils.

What you ask for is possible (like detecting 1eur at 35cm depth) at cost of many and many hours spent trying optimizing the TGS/TGSL for the best performance and stability. Not easy, but possible.

In air tests it's not so rare you can detect 1eur at 40cm also using 11'' coil and a perfect made circuit and cabling... of course, it's on-air detection... so in soil it's lower but 35cm is possible over 2.5cm coin.

Personally I think that even 1eur at 28-30cm, into the soil, is great result for an homemade MD and probably a more realistic GOOD target for many who tryed made it but haven't the time or skills to gain more extra depth.

Another option is making different coils: you can think at e.g. a 12'' coil for it, just you'll get more troubles from ground effect.

About BandidoII: I made it, but modified much so it's not bandidoII anymore...at first I made it just as in schematic but turned out I have not so good performances... but just average... then I changed so many things (I cannot remember all details now) also made specialized coils for it only, them work e.g. on TGS but not as good as on my BandidoII.
But it's really hard and tricky project and one could be lost in all details about easy. I don't suggest anyone building BandidoII for depth issues...or disc... better make the TGS, much more informations and coils details.

I will not say what's depth of my modified BandidoII but it's well more than 30cm with 1eur, using just a 22cm DD coil, not in air but in soil. That's much more than original BandidoII can make, using its original coils.

I know the exact depth I can reach with original coils cause I've tested with both 9x8'' and 8'' round from Tesoro... and it's well lower the results you can get with custom coils for it. I actually made an 8'' round concentric for it that outperform by 15% the original... this just to make you understand there's room for improvements on them.

Only lack of bandidoII is that , from time to time, I recover small steel made stuff like screws in disc mode...but much depends on ground balancing and soil contitions... in high mineralized soils it happens easy on shallow targets.

Apart this fact, it's really stable and performance is high.

I suggest you optimize your TGS/TGSL and coils ...cause getting 1eur at 35cm on the air (at least) is not so hard... and 25cm are too few for its potential: if you get 25cm on air you get probably 18-20 on soil... not that good... execially for a machine who proved much more depth ability... BUT REQUIRES TIME AND LOT OF EFFORTS... that's the real price you'll pay for that depth.

Kind regards,
Max

[ivconic]

Hi Max,Ivconic and others...
I have built tgs,tgsl,tgsl 1265 and more than 10 coils for them.
my coils data were same as ivconic send here.27cm former,tx=100,...
my devices were good at many test point that i check.
coils were nulled at least as i can and in various way.at
output lf353,directly to multimeter,with cap and res parallel and...
after assembling all them no more than 25cm in air test for a 2.5cm coin.
with all devices and all coils same.
i need to build a good vlf in depth and disc for coin...more than 35cm dpth.
please help me to make good one.
max...how is your bandido performance?for a 2.5cm coin?
do you used original component or...?
i want make one.(bandido)
if any other detector is in your mind that be good in depth and disc
please inform me.(its name its schematic coil data and its performace.)
i wish the best for you.

No One (so suitable) nothing will help you. Since you failed with TGS/TGSL which is so easy to make and adjust, than no other project will help you for sure.
Why i do have feeling that your post is just plain provocation.
I seriously have doubts that you ever made anything from your post!
You are appearing here under other nick just to provoke and nothing else.
Disregard is all you will face here in future (at least from me).

[Qiaozhi]

Hi Max,Ivconic and others...
I have built tgs,tgsl,tgsl 1265 and more than 10 coils for them.
my coils data were same as ivconic send here.27cm former,tx=100,...
my devices were good at many test point that i check.
coils were nulled at least as i can and in various way.at
output lf353,directly to multimeter,with cap and res parallel and...
after assembling all them no more than 25cm in air test for a 2.5cm coin.
with all devices and all coils same.
i need to build a good vlf in depth and disc for coin...more than 35cm dpth.
please help me to make good one.
max...how is your bandido performance?for a 2.5cm coin?
do you used original component or...?
i want make one.(bandido)
if any other detector is in your mind that be good in depth and disc
please inform me.(its name its schematic coil data and its performace.)
i wish the best for you.

If you need assistance with this project, I strongly suggest that you register. It's free, and only takes a few minutes of your time. Unregistered posters tend to be ignored and not taken too seriously. You will definitely get a better response that way.

[putrechigi]

quote

If you need assistance with this project, I strongly suggest that you register. It's free, and only takes a few minutes of your time. Unregistered posters tend to be ignored and not taken too seriously. You will definitely get a better response that way.

quote perhaps only wants to steal secrets and suggestions

[Qiaozhi]

quote perhaps only wants to steal secrets and suggestions

No - I don't think so. But I fail to understand why some people do not register. Either they are being lazy, or they're not really interested in the answer.

[gef12]

Hi,
it's not easy... getting the best from TGS, expecially if something is wrong at coil. Now, assuming you made coils the good way like described the problem is maybe somewhere else: in the circuit.

The TGS schematic, so also the TGSL, suffers from components selection variances... you find good components and it works superb in bench tests and reasonably very well on soil... just reduce a bit sensitivity to gain perfect stability when ground balanced.

If the circuit is the problem... then maybe some component is involved: e.g. first schematic used some old pieces like TL062... you must avoid them , are pesty things... noisy... better an e.g. 27M7 there or also a 27M2 or similar stuff... even a TL072 could radically change behaviour from using TL062.

Just an example... there are tons I can made but you only can check your circuit and look for noise sources and troubles...just follow the advices and you'll probably find a solution.

Now... I have to say that a coin at 35cm is possible for TGS, buried in ground, to detect but requires top tuning and lot of tweaking at e.g. coils.

What you ask for is possible (like detecting 1eur at 35cm depth) at cost of many and many hours spent trying optimizing the TGS/TGSL for the best performance and stability. Not easy, but possible.

In air tests it's not so rare you can detect 1eur at 40cm also using 11'' coil and a perfect made circuit and cabling... of course, it's on-air detection... so in soil it's lower but 35cm is possible over 2.5cm coin.

Personally I think that even 1eur at 28-30cm, into the soil, is great result for an homemade MD and probably a more realistic GOOD target for many who tryed made it but haven't the time or skills to gain more extra depth.

Another option is making different coils: you can think at e.g. a 12'' coil for it, just you'll get more troubles from ground effect.

About BandidoII: I made it, but modified much so it's not bandidoII anymore...at first I made it just as in schematic but turned out I have not so good performances... but just average... then I changed so many things (I cannot remember all details now) also made specialized coils for it only, them work e.g. on TGS but not as good as on my BandidoII.
But it's really hard and tricky project and one could be lost in all details about easy. I don't suggest anyone building BandidoII for depth issues...or disc... better make the TGS, much more informations and coils details.

I will not say what's depth of my modified BandidoII but it's well more than 30cm with 1eur, using just a 22cm DD coil, not in air but in soil. That's much more than original BandidoII can make, using its original coils.

I know the exact depth I can reach with original coils cause I've tested with both 9x8'' and 8'' round from Tesoro... and it's well lower the results you can get with custom coils for it. I actually made an 8'' round concentric for it that outperform by 15% the original... this just to make you understand there's room for improvements on them.

Only lack of bandidoII is that , from time to time, I recover small steel made stuff like screws in disc mode...but much depends on ground balancing and soil contitions... in high mineralized soils it happens easy on shallow targets.

Apart this fact, it's really stable and performance is high.

I suggest you optimize your TGS/TGSL and coils ...cause getting 1eur at 35cm on the air (at least) is not so hard... and 25cm are too few for its potential: if you get 25cm on air you get probably 18-20 on soil... not that good... execially for a machine who proved much more depth ability... BUT REQUIRES TIME AND LOT OF EFFORTS... that's the real price you'll pay for that depth.

Kind regards,
Max

Ye good idea to try replacement op-amps .. have replaced some tl064 with 74 and 54 .. try these or different batch of opamps.. some just out perform others..
cheers

[no one]

thank and ....

first thanks to max that reply me.i like max that help everyone that need him.he dont ask anyone why you dont register here.he want only help.im not a stealer and also dont want to provoke here or anybody.but if you think so...... i made that devices perfectly. better than those imaging me a stealer because i liked this detector and ivconic and his works. putrechigi do you think you are a big man with big ideas that if you dont be the world stop? always, everywhere are the man that help others.like max. i have register here but cant login with this name and pass.max i used original component in my devices.i made my coils exactly same as you.(your pictures)but didnt try to change opamps yet.i should say thank to you max that helped me.be luck in all around the life.i dont need help of them that imaging me a stealer any more.thank you allllll.