TESORO GOLDEN SABRE

[Jerry]

I cannot use my pc scope,now i have -6.22 volts on pin's 4 but i have a continous sound.What could be the problem i'm totally confused

Well that is telling your oscillator, negative power supply and to some extent the audio circuits are working properly. If they were not working, you would not get sound either. So you need to look elsewhere.

Now try breaking the signal path by unplugging something like the LM308's and see what happens.

Jerry

[der_fisherman]

Well that is telling your oscillator, negative power supply and to some extent the audio circuits are working properly. If they were not working, you would not get sound either. So you need to look elsewhere.

Now try breaking the signal path by unplugging something like the LM308's and see what happens.

Jerry

Do turn power off before popping the chips, its safer....
Andy

[Nandor]

Thanks guys for answers,but it was my coil now i have to find out why is the detection is sooooooo low.

[eduardo1979]

My TGSL-EDU,€1 coin 40cm.
http://www.youtube.com/watch?v=611aw...el_video_title

[kliner]

So whats the secret, is it a bought coil or home made?

[der_fisherman]

My TGSL-EDU,€1 coin 40cm.
http://www.youtube.com/watch?v=611aw...el_video_title

Great result, really well done.
regards
Andy

[eduardo1979]

The biggest secretis the coil.Theyhave to respectthe inductancesand the cancellation ofthe coil.Alsoyou have toreplacethe values in thePCBunder this scheme.C17a, b.C14a, b.R29, R31.That'sthe whole secret.

[Jerry]

The biggest secretis the coil.Theyhave to respectthe inductancesand the cancellation ofthe coil.Alsoyou have toreplacethe values in thePCBunder this scheme.C17a, b.C14a, b.R29, R31.That'sthe whole secret.

Ok, I see R29 and R31 are increased in value but C14/17a,b look to be the same. What am I missing?

Good test.

Jerry

[eduardo1979]

R29 and R31=1M. On the PCB TGSL-EDU C14 and C17=22uF + 22uF are in series = 11uF. I recommend everyone to have this PCB.Capacitors by substituting these series 10uF + 10uF= 5uF.

[Jerry]

R29 and R31=1M. On the PCB TGSL-EDU C14 and C17=22uF + 22uF are in series = 11uF. I recommend everyone to have this PCB.Capacitors by substituting these series 10uF + 10uF= 5uF.

Thanks. I was comparing it to Ivconics schematic which already had the two 10 uf.
I have 470k in my TGSL, may try 1meg and see what happens.

Jerry

[eduardo1979]

Will gain in depth. Works for me very well. The detector is very stable and does not false signals. The coil wire is connected by Don DFBOWERS. It is a USB cable.

[dfbowers]

Thanks. I was comparing it to Ivconics schematic which already had the two 10 uf.
I have 470k in my TGSL, may try 1meg and see what happens.

Jerry

Hi, Jerry.

Maybe you can verify my findings. By replacing the 470K resistors with 1M and using 10uF capacitors, you will almost double the gain of the detector. It will definitly make it more sensitive. But I found that the AM mode makes the TGSL difficult to keep quiet unless you are far away from sources of electrical noise.

Also, it changes the overall frequency response so that you may sweep the detector very slow and still get a good signal. Just be aware of the behavior differences and you should be fine. There was a post by Simon where he did a Spice simulation and confirmed this.
Don

[Jerry]

Hi, Jerry.

Maybe you can verify my findings. By replacing the 470K resistors with 1M and using 10uF capacitors, you will almost double the gain of the detector. It will definitly make it more sensitive. But I found that the AM mode makes the TGSL difficult to keep quiet unless you are far away from sources of electrical noise.

Also, it changes the overall frequency response so that you may sweep the detector very slow and still get a good signal. Just be aware of the behavior differences and you should be fine. There was a post by Simon where he did a Spice simulation and confirmed this.
Don

Thanks for the info Don. I vaguely remember you and Simon talking about that about a year ago. I will give it a try and see what happens. I prefer a detector that has more gain than is usable in some locations as long as the sensitivity can be set to a stable point.

Jerry

[satdaveuk]

mods

This message is mainly for Don and Vladimirs
Hi hope all is well
I noticed that Dons R29/31 are 1megs and you have decked the sens pot direct to earth doing away with R37.
On the other hand Vladimirs R29/31 IS 1.5 megs and he has left R37 in circuit together with a few other mods introduced D18 Zener, and R26/28 from 47k to 200k, also in the RX block hes introduced a 10k pot.
Can you both explain the pros and cons and give me a insight to them before trying them out please, im sure its all said here somewhere but i dont fancy tredging through all the pages again.
Also if anyone has the time can one of you make me a PCB layout where as the pots can be all mounted on the pcb and bolted to earth so i can build a housing where the pcb can be slid in as a complete item rather than mounting seperately.

Hope im not asking to much of you all
Warm regards

[satdaveuk]

Hey Simon!

Yes, the one on the left is civil war pattern. I have several that I dug in Maryland that look the same. Since the Spanish -American war was only 30 some years after the civil war, I'm wondering if they just used surplus items in some cases. I've found 12 buttons in the campsite so far. They are gold plated, thin brass.
Finding them with the TGSL requires a very low level of disc., almost as low as foil. I have to adjust mine to just eliminate hot rocks and still accept the buttons.

Yes your right Don and if your not picking up bits of foil you certainly wont be picking up small silver and the pre 1937 tanner.
setting up the TGSL is the same as with my Whites 1V and the Fisher 1265x plus ML Quattro

Regards