TESORO GOLDEN SABRE

[nelson]

Ok Ivconic, yes resistance is 12.3 ohms and i don´t know how to raice it. Should i use a resistor in series?
The low resistance, may be is for the wire diameter (to high).
I agree with you, experimenting is the clue.
Today i did`t have time to work on Golden Sabre. To much ofice work and i don`t know if tomorrow i ll have the time to do so. I m just wating next weekend to finish this MD and of course post results and expirencies with it.
Will keep on touch.
Best regards.
Nelson

Nelson, it is normal,inductance to raise a bit, when coil is "constrained" and
windings have less space between them. I also noticed that. Tape has nothing to
do with inductance changes...at least noticeable one.
6.85mH will work fine on G.Sabre. But i am concerned about resistivity...to low.
"...have to compensate the difference in mH...." No, no need for that.
"wire is 0.42 mm in diamater.." I think this is way to large. Better use 0.25mm.
or if cant find, than 0.3mm.
But since you already made it...it will be interested to test it, anyway.
Use that for TX and make another one with 0.3mm for RX...Try to keep resistance
over 18ohms....
I might be wrong on this, but my coils works vry good and resistances are over 18ohms,
also i used 0.25mm wire (0.28mm with varnish)...
Inductances are arround 6mH...more-less..
Regards!

[ivconic]

GS


Nelson, it is normal,inductance to raise a bit, when coil is "constrained" and
windings have less space between them. I also noticed that. Tape has nothing to
do with inductance changes...at least noticeable one.
6.85mH will work fine on G.Sabre. But i am concerned about resistivity...to low.
"...have to compensate the difference in mH...." No, no need for that.
"wire is 0.42 mm in diamater.." I think this is way to large. Better use 0.25mm.
or if cant find, than 0.3mm.
But since you already made it...it will be interested to test it, anyway.
Use that for TX and make another one with 0.3mm for RX...Try to keep resistance
over 18ohms....
I might be wrong on this, but my coils works vry good and resistances are over 18ohms,
also i used 0.25mm wire (0.28mm with varnish)...
Inductances are arround 6mH...more-less..
Regards!

[Max]

Hi,
MAX!
isn't
LM308 single amplifer?It should be replaced whith TL081!!?!??!?
And for LF353-TL082-dual amplifer??!!?!?!?!?
Thanks

p.s NE5534 insted of LM308?




Hi,
1. NO, LM398 is another thing (sample and hold IC) and you can't use there.
2. NO, they are different parts : ka2262 if FM demodulator pll; tea2262 is SWITCH MODE POWER SUPPLY CONTROLLER for TV/VCR sets.

Sorry, you can't. But you can try lm358/tl082 instead of 2262 and lf356/lf357 instead of lm308: they are very easy to find in europe and many other countries all around the world (are also obsolete parts but nevermind).

Best regards,
Max

Hi,
yes 308 is single, could use tl081 and ne5534 would be even better (much less noise). They are both really easy to find.

LF353, TL082 are dual, you could think also at NE5532 (much less noise, dual version of 5534) but look at consumption ; 1 ne5532 needs about 6mA !
I've tested on bandido and WOW I need another power supply circuit to drive that stuff there (-V rail ran out of steam with these philips pearls)...so I've putted tlc2262 from TI that required much less current though mantaining about same noise level.
But for all the rest they are wonderful devices, I use a lot of them in audio stuff and other things and they rocks.

Best regards,
Max

[nelson]

Hi Ivconic.
Yesterday i made the first coil. Before i place the electric tape it measured 6.5 mH and after a put the tape measured 6.85 mH and 12.3 ohms. Coil diameter is 19 cms and wire is 0.42 mm in diamater. My questión is if these values are accepted, because for the other coil i ll have to compensate the difference in mH. This means to made the coil for a value of 6 mH and after i place the electric tape should meassure 6.35 mH.
Or should i have to take of the electric tape to get the correct values of 6 and 6.5 mH?
REgards and thanks for your unconditional support.

Nelson

I'll try to prepare for tomorrow, if you are not in hurry...Dont have it prepared....I dont understand? It is so easy and clear..? Just obey schematic and trace pcb....For testing purposes you may omit "notch" and all arround it...Only disc./all metal switch is needed....Sens.pot and ON/Off switch...for disc and gnd may use trimmers while testing...
OK anyway i'll draw pic tomorrow...
Here is more details about coil...
regards

?

Hi,
MAX!
isn't
LM308 single amplifer?It should be replaced whith TL081!!?!??!?
And for LF353-TL082-dual amplifer??!!?!?!?!?
Thanks

p.s NE5534 insted of LM308?




Hi,
1. NO, LM398 is another thing (sample and hold IC) and you can't use there.
2. NO, they are different parts : ka2262 if FM demodulator pll; tea2262 is SWITCH MODE POWER SUPPLY CONTROLLER for TV/VCR sets.

Sorry, you can't. But you can try lm358/tl082 instead of 2262 and lf356/lf357 instead of lm308: they are very easy to find in europe and many other countries all around the world (are also obsolete parts but nevermind).

Best regards,
Max

[Max]

Hello,
MAX

For LM308 I suggest (but hard to find):
NTE398

Can I use LF398????
Will this be better than TL81 or its the same like NTE398?
And for LF353 you give TLC2262!
I can find Ka2262 and TEA2262!!

What will you advice me
THANKS

Hi,
1. NO, LM398 is another thing (sample and hold IC) and you can't use there.
2. NO, they are different parts : ka2262 if FM demodulator pll; tea2262 is SWITCH MODE POWER SUPPLY CONTROLLER for TV/VCR sets.

Sorry, you can't. But you can try lm358/tl082 instead of 2262 and lf356/lf357 instead of lm308: they are very easy to find in europe and many other countries all around the world (are also obsolete parts but nevermind).

Best regards,
Max

?

Hello,
MAX

For LM308 I suggest (but hard to find):
NTE398

Can I use LF398????
Will this be better than TL81 or its the same like NTE398?
And for LF353 you give TLC2262!
I can find Ka2262 and TEA2262!!

What will you advice me
THANKS

[ivconic]

Yes it is "movement" type of detector...or MOTION...
Daytona is simple yet very interesting..
Regards!

[detectoman]

ivconic

thanks for attention to us
your work is excellent
one question please say me
these detector gold sabre is movement? or not movement?
can add big coil dd what is features
is superior in depht or discrimination to my, spectrum xlt?
is the show diagram early daytona' excellent and practique simplification of metal detector discrimination your opinion in function

best wises ivconic and nelson

detectoman

[nelson]

Ivconic, many thanks for nice job you have done to help us with little knolegment of electronics.
Everything now is clear and tomorrow i ll connect those pots and swithces. I will also made the coil.
Excellent job and best regards.
Take care
Nelson

O.K. I did it now...Maybe a bit sloppy, but important is that you understand
how to connect those.
I guess there must be some other way to connect those, depends of what kind
of switches you may find...I connected it like this, since i had those
switches.
Switch On/Off may remain single, not attached on any pot, or can be in same
housing with Sense pot....never mind...
I wouldnt suggest you to use pot. for GEB, just leave it as trimmer.Adjust it
well on the ground, not to produce false signals while fast swinging over gnd.
Or you may use some hot rock instead real ground....or ferrite...
Do not forget those jumpers...What else...?

[ivconic]

....


O.K. I did it now...Maybe a bit sloppy, but important is that you understand
how to connect those.
I guess there must be some other way to connect those, depends of what kind
of switches you may find...I connected it like this, since i had those
switches.
Switch On/Off may remain single, not attached on any pot, or can be in same
housing with Sense pot....never mind...
I wouldnt suggest you to use pot. for GEB, just leave it as trimmer.Adjust it
well on the ground, not to produce false signals while fast swinging over gnd.
Or you may use some hot rock instead real ground....or ferrite...
Do not forget those jumpers...What else...?

[ivconic]

I'll try to prepare for tomorrow, if you are not in hurry...Dont have it prepared....I dont understand? It is so easy and clear..? Just obey schematic and trace pcb....For testing purposes you may omit "notch" and all arround it...Only disc./all metal switch is needed....Sens.pot and ON/Off switch...for disc and gnd may use trimmers while testing...
OK anyway i'll draw pic tomorrow...
Here is more details about coil...
regards

[nelson]

Thanks Ivconic. Yes i measured caps with another instrument and gives me 5.4 uF.
Ivconic, sorry for this question, but, can you draw how to conect swithces and pots. I can see on your MD that you place on the panes 3 pots and 3 switches. I have 3 pots just pots, 3 switches (on/off). Can these work on this project or i need a pot than can turn on/off and also do the resistance job?
Regards and thanks
Nelson

? Should read 5uF...or close?
Maybe you used bad capacitors?
Coil seems to be proper wired...it should work fine!
regards!

[ivconic]

?

? Should read 5uF...or close?
Maybe you used bad capacitors?
Coil seems to be proper wired...it should work fine!
regards!

[nelson]

Hi Ivconic. About the coil, is this configuration ok?
Thanks
Nelson

Hi Ivconic.
Today i finish tesoro golden sabre pcb with all components on it.
Just need to know how to connect swithches and potenciometers. can you draw it on the pcb to get a clearly idea?.
For 4.7uF caps i took two 10 uF electrolitics caps and solder the negative lead to each other. Then i place the positive leads on the board, but the value measure with my L/C meter II B, show 2 uF. Is this a problem?
For coil i ll make the same that you post.
Regards
Nelson

Here are pictures of my MD