TESORO GOLDEN SABRE

[eduardo1979]

The last modification TGSL.Air test:gold ring 40cm in the air,and is very stable.Regards.

[turtlebowl]

Fantastic!

That project looks excellent Eduardo. I sure wish I could open the files to hve a peek!
Earlier in this thread someone suggested opening the zip and looking for a file LAY used by Sprint 5.0 or something. BUT I have no idea what that is and certainly don't have that program. Or any other circuit drawing program. My computer tryes to open it with MS Works/office but it just looks lame with that program. The traces are hairline thin.
Many of the schematics here on the site are just PDF. Is it possible for someone here to help all us out and convert the files to a standard format?? Jerry has expressed a desire to take a peek also and I know there are many others who would like to see a successfully completed project her with all the data required to duplicate the effort.
Anyonegot the time and software for this favor??
That sure is a beaut Eduardo!! Phil

[geminis74]

Hi, Eduardo partner and work together, this is the version that best results have
achieved, but sometimes it becomes unstable, so we are still developing and finalizing,
any help is welcome


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[simonbaker]

That project looks excellent Eduardo. I sure wish I could open the files to hve a peek!
Earlier in this thread someone suggested opening the zip and looking for a file LAY used by Sprint 5.0 or something. BUT I have no idea what that is and certainly don't have that program. Or any other circuit drawing program. My computer tryes to open it with MS Works/office but it just looks lame with that program. The traces are hairline thin.
Many of the schematics here on the site are just PDF. Is it possible for someone here to help all us out and convert the files to a standard format?? Jerry has expressed a desire to take a peek also and I know there are many others who would like to see a successfully completed project her with all the data required to duplicate the effort.
Anyonegot the time and software for this favor??
That sure is a beaut Eduardo!! Phil

Here is a PDF of the layout.

eduardo1979: what layout did you base your layout on?

Can you post the exact schematic for the layout?

Cheers,

-SB

[eduardo1979]

I have no EAGLE program to modify the schema TGSL.It is an original TGSL've only changed the audio is of Eldorado and the sensitivity potentiometer 100k.I will add the FET in the TX because I read in the forum with the detector of FET transistor is more stable in mineralized ground.

[simonbaker]

I have no EAGLE program to modify the schema TGSL.It is an original TGSL've only changed the audio is of Eldorado and the sensitivity potentiometer 100k.I will add the FET in the TX because I read in the forum with the detector of FET transistor is more stable in mineralized ground.

Ok, I see you added the 220 uF cap for the audio circuit in your latest PCB. Just minor differences in a couple resistors.

Let us know if you think adding the FET improves anything. Usually you will lose some depth because the oscillator voltage is reduced (maybe you can tune it back up). I think the oscillator is pretty stable without the FET because it is overdriving the transistor.

-SB

[eduardo1979]

You are right with the FET does not gain, on the contrary, you lose some depth behind my experiments.Regards.

[Waka]

Hi Eduardo, I'm interested in this circuit, could you put the schematic and board layout without component? thank you very much __________________________________________________ __________________ __________________________________________________ __ Hola Eduardo, estoy interesado en este circuito, ¿podrias poner el esquema y el diseño de la placa pero sin los componentes? Muchas gracias

[eduardo1979]

TGSL.

[Jose]

Good job, Eduardo
At TGS, I experiment with the design of coils Ivconic.
I changed the TX coil with fewer turns and larger diameter cable.
Stage TX, also modified for more power.
Significantly improves sensitivity, but I could not reliza a proper balance in the RX signal.
Maybe someone will find a solution that would be the ideal.
Jose

[eduardo1979]

Thanks José!

[Dennis the Mennis]

Target Signal and Noise Signal on TGS made more visible

Hi ,

This is a small impression / test of the Target Signal and Noise Signal of the TGS measured on the output of the LM308 with an USB scope .
With this USB scope I'm using right now these signals can be made more visible compared to my old scope.

A man once asked on this forum if the Target Signal changes if the Rx coil ( or its leads ) is reversed : the answer in attached PDF.

It seems that this man is using his coils nowadays to hold his papers on his desktop .

See the PDF for all pictures !

Whenever I find time I will post some pictures of the Spectrum Analyzer under workshop conditions ... very interresting.


kind regards

Dennis the Mennis

[simonbaker]

Hi ,

This is a small impression / test of the Target Signal and Noise Signal of the TGS measured on the output of the LM308 with an USB scope .
With this USB scope I'm using right now these signals can be made more visible compared to my old scope.

A man once asked on this forum if the Target Signal changes if the Rx coil ( or its leads ) is reversed : the answer in attached PDF.

It seems that this man is using his coils nowadays to hold his papers on his desktop .

See the PDF for all pictures !

Whenever I find time I will post some pictures of the Spectrum Analyzer under workshop conditions ... very interresting.


kind regards

Dennis the Mennis

Hi DtM!

Very nice graphs - it makes me very interested in a USB scope.

One question - in your PDF, you show a graph labeled:

"Another Target Signal : A 1 euro coin passes the coil two times on 10-15 cm height , first part of signal is negative"

Next you show a graph labeled

"Close up / zoom in of Target Signal"

However, the close-up graph does not look like the same signal -- it does not seem to go negative first when detecting the coin. Are you sure you have the correct graph there?

Can you tell us some more about your USB scope? For example, is it easy to display other measurements along with the signal, such as RMS value of the sample, Max voltage, Min voltage, etc?

Thanks for this data. It gives a good example of what to expect with the RX coil shorted and also the typical noise in someone's workshop. We can compare our typical noise levels and perhaps help explain why we obtain such different air tests in our workshops!

Nice work!

-SB

[Dennis the Mennis]

[/quote]

Hi DtM!

Very nice graphs - it makes me very interested in a USB scope.

One question - in your PDF, you show a graph labeled:

Next you show a graph labeled

However, the close-up graph does not look like the same signal -- it does not seem to go negative first when detecting the coin. Are you sure you have the correct graph there?

Can you tell us some more about your USB scope? For example, is it easy to display other measurements along with the signal, such as RMS value of the sample, Max voltage, Min voltage, etc?

Thanks for this data. It gives a good example of what to expect with the RX coil shorted and also the typical noise in someone's workshop. We can compare our typical noise levels and perhaps help explain why we obtain such different air tests in our workshops!

Nice work!

-SB

Hi DtM!

Very nice graphs - it makes me very interested in a USB scope.

Hi -SB ,

The USB scope I'm using ( for my job ) is a PicoScope 3205

http://www.picotech.com/picoscope-specifications.html

( and no , I'm not a shareholder of PicoTech )

The software I'm using is version 6 and can be downloaded :

http://www.picotech.com/picoscope-oscilloscope-software.html

If I'm right this version is used for all type of scopes and this also the version I'm

using .

When downloaded you've got full functionality , no license key or what so ever needed ,

only it won't recognize the USB device so it will ask if you want to run it in ' demo ' mode

and there you can play around with several pre installed measurements and cases .

Can you tell us some more about your USB scope? For example, is it easy to display other measurements along with the signal, such as RMS value of the sample, Max voltage, Min voltage, etc

I still have to get used to the controls , If I may say so I could 'dream' the ordinary scope ... I guess time will do rest

Can you tell us some more about your USB scope? For example, is it easy to display other measurements along with the signal, such as RMS value of the sample, Max voltage, Min voltage, etc?

I think the min voltage is currently 20 mV/div but you can zoom in a lot , haven't tried

that yet.

The max voltage is on both input and ext triggering 20 V ( big disadvantage because

collegeas blew up the input , they used during measurements with a pick up coil near a

transmittercoil : big induction , bye bye input )

If you don't know what voltage to expect use a x100 probe ?

The measurements you can do are to many to tell , RMS ? yes no problem

Try the demo mode , the two( or more ) inputs can be displayed in several modes : in scope / analyzer / together / separate etc etc

One question - in your PDF, you show a graph labeled:

Next you show a graph labeled

However, the close-up graph does not look like the same signal -- it does not seem to go negative first when detecting the coin. Are you sure you have the correct graph there?

No , I'm not sure , in fact I used the wrong graph overthere , sharp observation though , the zoom-in graph is not correct there .

But is shows prefectly why the TGS(L) detects a coin 'twice' when it passes the coil one time and the leads are twisted or the coil is flipped compared to 'normal ' operation :

In normal use the Target Signal has the W shape : first negative and the positive where it triggers the positive alarm treshhold of +/- 50/60 mv (?) once.

When the coil is flipped or the leads are reversed the Target Signal seems to have a M shape : First positive ( also first alarm on positive alarm treshhold ) , next negative sinus ( no alarm) , last of M shape Target Signal is positive again ( and alarms for the second time ? ) see attachment


hope to post more findings soon

best regards ,

Dennis the Mennis

[simonbaker]

Hi DtM -

Thanks for extra info.

W and M is a nice way to explain the detection waveform due to coil polarity. When coil is backwards, you can see why we can get a double-beep easily.

I was wondering if you have display options for displaying Multimeter type of measurements at the same time as the graph - for example, the RMS and peak voltage values?

Can you show us the outputs of your LF353 for fun?

Cheers,

-SB


Hi -SB ,

The USB scope I'm using ( for my job ) is a PicoScope 3205

http://www.picotech.com/picoscope-specifications.html

( and no , I'm not a shareholder of PicoTech )

The software I'm using is version 6 and can be downloaded :

http://www.picotech.com/picoscope-oscilloscope-software.html

If I'm right this version is used for all type of scopes and this also the version I'm

using .

When downloaded you've got full functionality , no license key or what so ever needed ,

only it won't recognize the USB device so it will ask if you want to run it in ' demo ' mode

and there you can play around with several pre installed measurements and cases .



I still have to get used to the controls , If I may say so I could 'dream' the ordinary scope ... I guess time will do rest



I think the min voltage is currently 20 mV/div but you can zoom in a lot , haven't tried

that yet.

The max voltage is on both input and ext triggering 20 V ( big disadvantage because

collegeas blew up the input , they used during measurements with a pick up coil near a

transmittercoil : big induction , bye bye input )

If you don't know what voltage to expect use a x100 probe ?

The measurements you can do are to many to tell , RMS ? yes no problem

Try the demo mode , the two( or more ) inputs can be displayed in several modes : in scope / analyzer / together / separate etc etc






No , I'm not sure , in fact I used the wrong graph overthere , sharp observation though , the zoom-in graph is not correct there .

But is shows prefectly why the TGS(L) detects a coin 'twice' when it passes the coil one time and the leads are twisted or the coil is flipped compared to 'normal ' operation :

In normal use the Target Signal has the W shape : first negative and the positive where it triggers the positive alarm treshhold of +/- 50/60 mv (?) once.

When the coil is flipped or the leads are reversed the Target Signal seems to have a M shape : First positive ( also first alarm on positive alarm treshhold ) , next negative sinus ( no alarm) , last of M shape Target Signal is positive again ( and alarms for the second time ? ) see attachment


hope to post more findings soon

best regards ,

Dennis the Mennis[/quote]