TESORO GOLDEN SABRE

[ivconic]

No ideas..

[nelson]

A picture speaks more than 100 words

Hi Ivconic. What can i said, you are the master about this golden sabre project and the picture gives me a very clear idea about how to connect the coil.
Didn´t know that you can replace that 4.7 uF caps with two in series 10 uF electrolitic caps to get 5 uF cap.
Yes i think i will try TL081, this is a very common IC here.
Again my friend, i just whant to thank you for been a good man on sharing with us your knolegment and expirencies, that let us know more and more about electronics and MD.
Best regards
Nelson

Took another look at it, and...YES! KT315 is right! I traced pcb again.
Yes KT315 you are right! How i missed that!!!??? I have few different
schematics here....I payed attention on wrong one...Shhheeeeeesh!!!
Bravo KT315 and thank you!
But about loading resistor you mentioned...? I am not sure? Yes i can agree
with you, there must be loading resistor...but it is not there? And device is
working excellent!?
I corrected schematic and here is now; i really hope complete and accurate!
Porkluvr....Yes double O coil showed best results so far...but i gave up of those!
Why? I am gonna explain why; not so suitable on terrains i've been visitng lately.
There are a lot of bush arround,tree roots all over arround, high density opsticles
and OO coil is not just suitable enough to approach to every spot;under some tree or
between some stones...when coinshooting. I do that mainly...coinshooting.
So i made hard compromise and switched back to DD (double D) coils, again...
Double D shape is much more suitable for that kind of prospecting than double O.
But if you prefer leveled terrains than i suggest you to make OO coil cose a bit
greather depth than DD coil.That was my only reason to leave OO coils for now...
No i didnt say "...no gnd connection on RX..." !? Yes there is gnd connection on RX!
Must be! But not at pcb. That's why i didnt draw gnd connection in schematic.Not to
confuse somebody who might decide to draw pcb according my schematic...Later should
scratch or cut that piece of pcb to correct mistake...
GND connection at RX should be made in coil.
Pay attention on cable lead which connect coil via R13 to pin 6 of U101a!That lead must
be connected to gnd in coil!
I am using cable with 3 separate leads and common shield. Shield and 1 lead are connected to
faraday cage at both coils...all togather in coil housing. The other 2 leads i am using for
TX and RX....Simple as that. No twisted pair effect,no hums,interferences...no false signals!
I experimented with any other combination and this one is best.
Nelson, no you can not use only 3 lead cable....Shield and 3 leads yes! It makes 4 leads at
the end.
LM308 is hard to replace...beleive me! Only replacement i would use is TL081a...
About Bipolars....i never used those. I connect 2 ordinary 10uF cpacitors like this;
+ -- + and used those instead...
No, Nelson...if you using TLxx1 no need to reroute pcb; pin to pin compatible...
About NE5532...i am not sure...why dont you try NE5534? I never tried it...
OK. Again there is (i hope) very correct schematic...at the end. Take another look.
If something wrong let me know...
Anybody migh have good will to draw pcb for it? One-sided,small...C'mon....

[Hush]

About nulling and tuning...

As you see, need explain about nulling coils. Is it posible nulling coils without
osciloskope, with unimeter which can measure voltage peaks, and without hmm... signal generator? He-he, I haven't much instruments, but have good
will. Also need some explains about tuning... maybe someone wish to tell me something more about it? Maybe Max from Mars or Ivconic or...
Wish you all the best!

[Unregistered]

Hi

Hi,
Can I replace LF353 whit TL072?Will this afect the preformance?
Thanks

[Ultimate_Haze]

???????

HEllo,
If I replace LM308 whit TL081 is there need of changing the pcb or they are with the same pin configuration?Only replace?
Thanks

[Unregistered]

HELLO?????????

Hello,
Can someone finaly explain how to connect the potentiometers and switches????
And their princips of operation?
Please

[kt315]

ivconic, can you connect simply resistor 1 MOhm in parallel to the diode? NOT TO THE SOURCE

!!! a source WILL BE COME UP for comparator output in case, if DC voltage on OP AMP output will be grow !!! you NOT NEED in the loading resistor you imaged!

[Unregistered]

Hi

Hi,
Can I replace LF353 whit TL072?Will this afect the preformance?
Thanks

[nelson]

Same pins

Hi, has Ivconic said, you can just replace LM308 by TL081, no mods to the pcb board needed. Ivconic also said that he has never try this but in theory must work. Don´t know anything about performance jet. When i finish mine, i ll post results.
Regards
Nelson

HEllo,
If I replace LM308 whit TL081 is there need of changing the pcb or they are with the same pin configuration?Only replace?
Thanks

[Unregistered]

????PLEASE HELP???????

Hi,
Can I replace LF353 whit TL072?Will this afect the preformance?
Thanks

[Unregistered]

NELSON

I think that you will be ready before me!I haven't time lately!
For 308 I understend,but londering can I use TL071 insted of 353?
I have read that thy are equal and even cheeper replacement!
But not shore!
See you...
Have you made the board allready?

[ivconic]

OK KT315, I'll try that way. Later repost results...Thanks!

Unregistered.....Just read whole thread...no need for "rain of questions"....
You have already explained everything here....read from 1st page...
Regards!
BTW...wish u luck!

[Unregistered]

HEllo!!

Hi,
IVCONIC:
Can you just tell me can I use TL071 insted of 353?
Will this change be equal?
Can you also PLEASE explain how to conect the switces?
Thanks

p.s.I have read all more than 20 times
Just beginer

[Qiaozhi]

Hi,
IVCONIC:
Can you just tell me can I use TL071 insted of 353?
Will this change be equal?
Can you also PLEASE explain how to conect the switces?
Thanks

p.s.I have read all more than 20 times
Just beginer

Why don't you register?
It's very simple, and you no longer have to type in the special code in order to post anything.

[kt315]

OK KT315, I'll try that way. Later repost results...Thanks!

Unregistered.....Just read whole thread...no need for "rain of questions"....
You have already explained everything here....read from 1st page...
Regards!
BTW...wish u luck!

pls, change U101a on NE5534 or another one opamp-in-dip. not use two opamp-in-dip for preliminary RX amplifier . or then second opamp do unused.