TESORO GOLDEN SABRE

[sdesic]

I have strange TX graph ... it is cut off

TX is cut off, RX is one sine wave.

Maybe it is not adjusted with board or ...

[bernte_one]

It is OK to know that if I get one of those coils cheap.
15nF can be changed to 10nF or less
How do I calculate that value ?

http://www.lautsprechershop.de/index...hwingkreis.htm

http://www.lautsprechershop.de/index...hwingkreis.htm

http://www.lautsprechershop.de/index...hwingkreis.htm


http://www.do2jmg.de/article.php?sho...reis_%20online


attention chosse for lc circuit if caps are parallel or in serie

[sinclairuser]

Coils can go any which way just swap the leads on RX if you get a double beep.
It's better for RX to be nearer to the ground (for better signal pickup).
For less noise it would be better if the outer wires were towards electrical ground.

I use this calculator to find cap values;
http://www.siversima.com/rf-calculat...FfB3cAodsAgAzg

hi all does any one have a multi input calculator, like this one but so it will give cap values, if you know the freq and inductance.

[paku]

Are you shure it is gold?
Can you try gold coin?
Rings are difficult...

i dont have gold coin bro i just have gold ring
my gold ring is real gold i buy it

[paku]

http://www.lautsprechershop.de/index...hwingkreis.htm

http://www.lautsprechershop.de/index...hwingkreis.htm

http://www.lautsprechershop.de/index...hwingkreis.htm


http://www.do2jmg.de/article.php?sho...reis_%20online


attention chosse for lc circuit if caps are parallel or in serie

i dont know use this calculator

[paku]

hahaha now i have fix my tgsl but i dont know working in outside or not
but now is working find
i change
caps 15nf to 10nf
sens pot 10k to 25k

[seadoggy]

hahaha now i have fix my tgsl but i dont know working in outside or not
but now is working find
i change
caps 15nf to 10nf
sens pot 10k to 25k

So bro do you have sound when you touch the box of TGSL??,how about deep same or ??

[paku]

the deep is not same bro lost to much deep but all noise sound is gone
and very stable 1euro i got about 28cm
small gold ring about 25cm

[paku]

now problem noise again
need help how to
measure voltage
from

LM358
LM393
Lm308
LF353

All i see on schematic Pin 4 is 5v and pin 8 and 7 is 8v

[sdesic]

Null phase



U101 and gate or TR5

With lot of EM fields.
If I get metal close to coil it clears - sine wave.

Only coil shield (USB cable shield and coil shield - mylar) is on GND and one of two wires TX (from PCB)

[paku]

this is commercial detector
all will be silent with this project

[sdesic]

this is commercial detector
all will be silent with this project

You can try to find manual how to convert TGSL EDU to regular TGSL.
It has less amplification as I recall - so stable detector and probably same depth.

Looking for TGSL field test video - test coin bed.
Anyone ?

[Silver Dollar]

Well reducing the 1meg in the first filters to 470k is a start.
The original had a small TX 8.X volts as I remember so adding
the FET stabilizer will tone the TX down.

These designs are sensitive to TX and RX changes. I'd recommend
building as per original schematics before doing any mods.

[Silver Dollar]

I found some MAX667 LDO's that I'm going to use on my TGSL.
The big thing about these is they are adjustable! So I can run
the TGSL at 7v from a 9v battery! Nice!

http://www.maximintegrated.com/en/pr...rs/MAX667.html

The original 8v LDO I used was a 1.5 amp device and used 10ma by itself
this one is 20 microamps.

[sdesic]

Finished second DD coil for my second TGSL kit.
Standard 30 cm for 1 EURO coin indoors with sens at 3/4.
What can I change to gain more depth ?

RX and TX caps ... to adjust freq.
15 nF (it is 10nF now) and 22nF and 220 nF ?

RX 6.5mH 25.8 Ohm - tried to be on that value - extra few turns
TX 6.0mH 24.5 Ohm