Classic III

[ivconic]

Brief...


Very good news!
Here is brief how to adjust frequency....
You should rearrange those now...
About instrument....i do not know?
Now i am in a hurry....see you later...
Regards

[Geo]

Hi Ivconic. Now i make the audio board with 2x 4n35, 2x 555 and 1xLM386. I will make 2 tones, one for disc and one for PP. Now about adjusting. Can you say me how to adjust the VR1 (50K) at IC1? Jackdetect said to Esteban to experience with it for ground balance. Is there any way to do it at Lab?
Best Regards

[Geo]

Hi Ivconic. I made the new audio with 4n35, 55 and lm386. It work perfect(clear and strong tone ). I connected only the one 4n35-555 for the time, the other another time. Tommorow i will go to Athens for 5-6 days and when i come back i'll try to make the coil. I have not so good sensitivity as your CL3 so i believe that the problem is the coil. With the chiness coil of MD-5002 (DD 10in) i can detect a 2Euro coin at 30cm and 32..35cm at PinPoint, a 100 DRX coin (30MM) at 32cm and 40 .. 42 cm at PP, a pcb 5x5 cm at 40..42 cm and 55 cm at PP, and a 1Lt paint can at 85cm and 95..100 cm at PP. At Athens i will have internet so you can answer me.
Best Regards

[ivconic]

...


"Now i make the audio board with 2x 4n35, 2x 555 and 1xLM386. I will make
2 tones, one for disc and one for PP...."

I wouldnt use LM386 if i were you! 2907 is doing just fine.... But i am so interested
to se your setup with "doubling" of those.
When you finish it and test it, can you post here schematic of your audio?

"Now about adjusting. Can you say me how to adjust the VR1 (50K) at IC1?
Jackdetect said to Esteban to experience with it for ground balance. Is there any
way to do it at Lab?"
I am very sorry to say, but Jackdetect missunderstood this schematic from the begining...
We were arguing a lot about it...at the time...Later showed that i was right....

I forgot to mention that only way you can affect frequency but still not to distort
overall performances, is to experiment with coils and later fine adjust with caps...

1K pot is actually for phase adjusting...You may notice that in pinpointing mode. If phase
is not adjusted properly - you wont hear any sound in pinpointing mode...Of course best way
to adjust it is to follow curve on scope....I can not help you much with this....i busted
my scope and still do not have another....ts,ts,ts....
50K pot is GROUND BALANCE...It is very "tricky" part of the pcb,very sensitive on touching
and "screwing" arround it...I "pulled" out that trimmer and put 10K pot (also 5K can do...)
instead, on front panel...
I connected it with pcb using coaxial,"heavy" shielded cable to avoid interferences.Also
i "grounded" pot.housing by soldering it to GND....also front panel and box too.

100K trimm. is TRESHOLD...you can adjust it very fine in pinpointing mode also.Switch in
pinpointing mode, use some coin to test near the coil and adjust trimm. so the level of
sound suits your expectations....This can be very subjective...You do not need to obey any
"factory" preset...
What to say? Your device is working and that is most important.The rest is up to you.
It can be very nice detector and also very open for further improvements....
I am very ready to try any of improvements you may suggest here. I am waiting snow here...
Now I am still going out,on the field...prospecting. When winter comes than i'll start
experimenting with several devices...CL3 amongs them,for sure!

[Geo]

Hi Ivconic.
After a big problem at my Family i am back again. Yesterday i tried the CL3 and i have a question about disc. At disk mode i have a tone for ferrous object and two tones for non ferrous objects. Is this ok or i must reverse the coil wires (only for Tx).

"
I wouldnt use LM386 if i were you! 2907 is doing just fine.... But i am so interested
to se your setup with "doubling" of those.
When you finish it and test it, can you post here schematic of your audio?
I dont finished the double tone audio yet. When i will finish it i will send it to forum.

I forgot to mention that only way you can affect frequency but still not to distort
overall performances, is to experiment with coils and later fine adjust with caps...
I made fine tuning with oscilloscope but detector come unstable


50K pot is GROUND BALANCE...It is very "tricky" part of the pcb,very sensitive on touching
and "screwing" arround it...I "pulled" out that trimmer and put 10K pot (also 5K can do...)
instead, on front panel...
I connected it with pcb using coaxial,"heavy" shielded cable to avoid interferences.Also
i "grounded" pot.housing by soldering it to GND....also front panel and box too.
I made it with coax and no problem

100K trimm. is TRESHOLD...you can adjust it very fine in pinpointing mode also.Switch in
pinpointing mode, use some coin to test near the coil and adjust trimm. so the level of
sound suits your expectations....This can be very subjective...You do not need to obey any
"factory" preset...
It stops to sound only at full left regulate

Best Regards

[ivconic]

Yes


Yes, replace wires of tx or rx...not both!
Also try to fine readjust cap on coil...add a few nF or substract...

[Unregistered]

classic III

Hi Ivconic.
After a big problem at my Family i am back again. Yesterday i tried the CL3 and i have a question about disc. At disk mode i have a tone for ferrous object and two tones for non ferrous objects. Is this ok or i must reverse the coil wires (only for Tx).



Best Regards

HI GEO.
Geo ise ellinas? endiaferome gia tin ktaskevi tou cl3

[fitos]

classic III

HI GEO.
Geo ise ellinas? endiaferome gia tin ktaskevi tou cl3

Hi Geo.
Had you tried the cl3 to the ground ?

Best regarts

[Geo]

HI GEO.
Geo ise ellinas? endiaferome gia tin ktaskevi tou cl3

Hi You cam build it. It is a good detector.
Γεια/ Οπως βλεπεις Ναι . Ο CL3 ειναι ενας απλος αλλα πολυ καλος ανιχνευτης. Αυτο τον καιρο εχω καοια προβληματα και δεν ασχολουμαι με αυτον.Σε λιγο καιρο θα ασχοληθω παλι για να κανω μερικες τροποποιησεις.Ισως αξιζει να περιμενεις. Απο που εισαι??
Ευχες

[Geo]

Hi Geo.
Had you tried the cl3 to the ground ?

Best regarts

Hi Fitos. I have not try it at the ground. maybe next month because i will modify it.

To Ivconic. Hi Ivconic. I don't forget you but i have some big problems of health at my Family so i have not time to write you or to modify the CL3.
1. I made the 2 tone audio but it needs one OpAm yet because it lose the sensitivity at no ferous .
2. I wait for 2coils housings (36cm) so when i receive it i will try the modification.
3. I want to change the Disc and to do it as Bandito. It has the disc potentiometer to do phase change and not mix the two signals (ferous and no ferous) as it is the CL3.
I have not other time. i must leave.
Best Regards

[fitos]

classic III

Hi You cam build it. It is a good detector.
Γεια/ Οπως βλεπεις Ναι . Ο CL3 ειναι ενας απλος αλλα πολυ καλος ανιχνευτης. Αυτο τον καιρο εχω καοια προβληματα και δεν ασχολουμαι με αυτον.Σε λιγο καιρο θα ασχοληθω παλι για να κανω μερικες τροποποιησεις.Ισως αξιζει να περιμενεις. Απο που εισαι??
Ευχες

Γεια Geo . Ειμαι απο την κυπρο . Θα σε περιμενω να κανης τις τροποποιησεις
και να κανης και αξιολογηση του CL3 και στο εδαφος .Εχω κατασκευαση το VLF eti 1500 discriminating metal detector ,to test στον αερα ηταν καλο ,στο εδαφος ηταν αχριστος. Ελπιζω ο CL3 να ειναι καλος .
Χαρικα που εισαι Ελληνας
Ευχες για'σενα και στην οικογενεια σου με υγεια

[Geo]

Γεια Fitos. Καλο ειναι να περιμενεις τις τροποποιησεις. Ο Classic III ειναι ενας ανιχνευτης δοκιμασμενης αξιας. Εχει πολυ καλο βαθος (ειδικα στο all metal function) και μετρια διευκρινηση μεταλλων. Ξεχασα να πω οτι ειναι πολυ απλος στη λειτουργια του και πολυ σταθερος. Τωρα λιγα αγγλικα για να μην γαβγιζουν οι αλλοι!!!!
Hi Fitos. The CL3 is a very good, simple and stable detector with medium discrimination. It has very good depth (read what vconic writes) on air and in the ground. You must way me to finish some modifications on it.
Regards

[fitos]

classic III

Γεια Fitos. Καλο ειναι να περιμενεις τις τροποποιησεις. Ο Classic III ειναι ενας ανιχνευτης δοκιμασμενης αξιας. Εχει πολυ καλο βαθος (ειδικα στο all metal function) και μετρια διευκρινηση μεταλλων. Ξεχασα να πω οτι ειναι πολυ απλος στη λειτουργια του και πολυ σταθερος. Τωρα λιγα αγγλικα για να μην γαβγιζουν οι αλλοι!!!!
Hi Fitos. The CL3 is a very good, simple and stable detector with medium discrimination. It has very good depth (read what vconic writes) on air and in the ground. You must way me to finish some modifications on it.
Regards

OK Geo Thanks.

[Geo]

Hi Fitos. You can begin slowly -slowly by constructing the coil . Until finish the coil i suppose the modifications to be O.K

[fitos]

Hi Fitos. You can begin slowly -slowly by constructing the coil . Until finish the coil i suppose the modifications to be O.K

Hi Geo .O.K bat i need tada for this coil. can you help me?

Regards