TESORO GOLDEN SABRE

[ivconic]

In this case, actually, no need to choke harmonics...at least sidewards, which are stronger in spectrum...Some "soft" filter can be applied to choke only far harmonics....piece of cake!

[ivconic]

Now....idea for thinking further;

Sidewards of 32kHz are 16kHz and 64kHz. Right? How about "tribander"?

*16kHz for prospecting, (actually this is to high for prospecting)
*32kHz for coin shooting,(not bad for coinshooting)
*64kHz for nuget hunting.(perfect for nuget hunting)

3 separate (exchangeable) coils...etc.

Ha? How about this? To use drawbacks and turn to benefits? Ha?

[ivconic]

About TGS power...
I was thinking to mod oscillator and gain more power. No. Now i have another approach to this subject; to put square oscillator there and try to filter harmonics...It will be easy to filter RX with bandpass...but how to filter TX.??? Even when quartz oscillator used, during dividing, each of divider involve some own hum and proceed it further. At the end we have harmonics too. It is not easy to filter output at all!? Damn! Especially nearest upper and lower harmonics. If quartz is overtoned (usually they are) than is possible to have stronger harmonics than leading frequency. I saw that in practice many times.
Least quartz i have is one from the clock. 32kHz. Must be divided with 2.
I measured 6000 DI Pro oscilator with Spectra spectrum analyzer. The heck!
Sideward harmonics were 70% amplitude of main!!!
6000 DI/Pro is fine detector, but i noticed some drawbacks in real prospecting with it....and those are (i can swear) due unperfectness of TX-ed signal..
So now, these days, i am exploring this....

[Geo]

140Vp-p, Yes. So when you try to Null the coil if you will take 200mv on Rx coil then you are OK
Another story
Bye

[Max]

"..Anker SS60 oscillator gives a signal of 140V p-p !!!!!"

Not only detector but weapon too! Burn grass easilly! Also kill any eventual snake in that grass! Heh,heh,heh...!

Best regards!

Hi,
yes... maybe! 140Vpp ...uhm... I think it will ring and someone could hear it during burning... but my thought is about if we can mount one of this weapons on TGS... to see what happens... if plastic melt or something... or just if it will detect (in air) coins at 70cm...

Who knows ?

Best regards,
Max

[ivconic]

"..Anker SS60 oscillator gives a signal of 140V p-p !!!!!"

Not only detector but weapon too! Burn grass easilly! Also kill any eventual snake in that grass! Heh,heh,heh...!

Best regards!

[Geo]

Hi Max.
My coil was 5mH and the frequency 6..Khz (i don't remember exactly, but not 3Khz). Voltage was 140V p-p.

[Max]

Hi Max. Anker SS60 oscillator gives a signal of 140V p-p !!!!!
About GEB ........ it is about like TGS. It has a trimmer for GEB. But as on Tessoro when you willturn more the trimmer you maybe distroy the disc a little.
But the TGS if works ok (not to me until make a New coil) will be a very good detector. I have a xlt and a GTI2500. At disc mode on air are about the same with TGS. XLT gives 45cm for a coin 2Euro, the same the GTI with 12.5in coil. TGS with 12.5in coil will give 40cm for a coin 2 Euro, so in the ground will be the same.
Regards

Hi Geo,
what's the story with Anker TX ? I mean I read an Anker's post that say

TX - 50-60 turns wire diameter 0,3мм

Then when I've simulated circuit I got that to have 140Vpp at out you need use at least a 18.5mH inductance coil at TX... otherwise you get less voltage cause of resonance.

What about frequency too ? I get 140Vpp at 3KHz not 6.2KHz for TX.

Am I wrong ?

Look diagrams:
first is with coil = 5mH
second is with 18.5mH

Best regards,
Max

[Geo]

Hi,

I think that a very good one new candidate would be AnkerSS60 (or some its brothers) but with a mod related to GEB... cause without GEB it will be totally unuseful on real soil.

Of course... we can also play with mods on osc of TGS more and more... putting out 30Vpp or more... and see what happens!

Maybe it will beat also SS60 that way in air !

What do you think ?

Best regards,
Max

Hi Max. Anker SS60 oscillator gives a signal of 140V p-p !!!!!
About GEB ........ it is about like TGS. It has a trimmer for GEB. But as on Tessoro when you willturn more the trimmer you maybe distroy the disc a little.
But the TGS if works ok (not to me until make a New coil) will be a very good detector. I have a xlt and a GTI2500. At disc mode on air are about the same with TGS. XLT gives 45cm for a coin 2Euro, the same the GTI with 12.5in coil. TGS with 12.5in coil will give 40cm for a coin 2 Euro, so in the ground will be the same.
Regards

[Fred]

Wrong IC1/IC3
corrected:

[Fred]

I post here the schematic and parts layout with IC´s and transistors numbers.
In conjunction with the oscillograms from Max it is perfect for troubleshooting.

Regards,
Fred

[Fred]

Ok Ivconic,
Thanks for informations!
When you said you were nulling with capacitor directly atached to coil, i assumed it was without cable.So it is a missanderstanding...Your precisions are usefull.
Thanks again,
Be cool!
Regards,
Fred.

[ivconic]

I guess this is a kind of missunderstanding!? I am using final cable when nulling coils.Simply as that.
Otherwise i dont know how to balance coil without cable?
If coil chords (to short) attaached directly to unimeter than must be very close, which will, on the other hand, provoke some induction in coil.
When nulling, i put coil on huge plastic table,1.2m away from soil,1m-1.5m away from nearest metal, and than null it. For example, when 0.000 on unimeter achieved, if i apply coin close to coil, than it will read 0.015-0.040mV...showing induction - logically!
As larger item applied close to coil, larger the reading on unimeter...A bucket (iron) will cause 0.1xxmV reading on unimeter....Simply as that.
You must be sure there is no metal arround coil when nulled.Otherwise you will "null" coil to present situation, which can be pretty falsed if some induction occured! Pay attention!
Further, i just have to attach and fix original cable to coil, to be sure i will null it as best as i can....So you may say - my coils are nulled including cable...Heh! If some errors; than those are pretty small.....but i dont thik there are any, due attached capacitor. Think about that.
Regards!

[ivconic]

Of course i am using final cable when balancing! Who told you i wasnt?

[Fred]

Ivconic, this is exactly my point: you explained before how you null it with a capacitor and multimeter,so you are not using the final cable?
Regards,
Fred