TESORO GOLDEN SABRE

[ivconic]

http://www.geotech1.com/forums/showp...8&postcount=20

Exactly!

[Molzar]

Dennis,

Really just pointing out that different coil designs give different results regarding waveform characteristics. This was also dicussed in earlier posts than one Stefano cited, also by Qiaozhi I think.

How is Mr. Wlison?.....

Molzar

[Dennis the Mennis]

Dennis,

Really just pointing out that different coil designs give different results regarding waveform characteristics. This was also dicussed in earlier posts than one Stefano cited, also by Qiaozhi I think.

How is Mr. Wlison?.....

Molzar

Hi Molzar ,

Mr . Wilson sends his regards

regards

Dennis the Mennis

[Molzar]

That's not them! These are the original guys I remember......

[Dennis the Mennis]

Perhaps I'm not that old ? hahahaha ;-)

[dfbowers]

TGSL input voltage vs. performance.

Just curious.. I have been playing with my TGSL and just for fun, I replaced my 12V power source with an alkaline 9V battery and immediately noticed an increase in performance. I gained a significant (an inch or two) increase in depth, and the audio became slightly weaker, but longer and more drawn out. The thing that caught my attention was the increase in detection depth. Anyone have a 9V battery that they could drop in theirs to see if they experience the same?

Here are some other observations:

Supply Voltage: 11.4 v (8 AA) ------------- 8.5v(9v alkaline)

Regulator output: 7.9v ---------------------- 7.1v

Negative rail: -6.1v ------------------------- -5.3

TX amplitude 15.5v p-p ---------------------- 15.1v p-p

Current consumption 24mA ------------------- 25mA

TX Frequency No significant change noticed.

Phasing No noticable difference.

Thanks..
Don

[simonbaker]

Just curious.. I have been playing with my TGSL and just for fun, I replaced my 12V power source with an alkaline 9V battery and immediately noticed an increase in performance. I gained a significant (an inch or two) increase in depth, and the audio became slightly weaker, but longer and more drawn out. The thing that caught my attention was the increase in detection depth. Anyone have a 9V battery that they could drop in theirs to see if they experience the same?

Here are some other observations:

Supply Voltage: 11.4 v (8 AA) ------------- 8.5v(9v alkaline)

Regulator output: 7.9v ---------------------- 7.1v

Negative rail: -6.1v ------------------------- -5.3

TX amplitude 15.5v p-p ---------------------- 15.1v p-p

Current consumption 24mA ------------------- 25mA

TX Frequency No significant change noticed.

Phasing No noticable difference.

Thanks..
Don

Ok, now you've got our attention...

Are you using an LM7808 regulator in your circuit or something else, or none at all?

-SB

[dfbowers]

Simon,

Yep, I'm using the LM7808. As you can see, it regulates down to 7.9V with a 12V source. The only difference in my circuit is that I am using one TL081 and one TL061 in place of the LM308s.. I need to order a pair of TL071s or TL081s I guess. I'm using cheap ceramic caps throughout except for polyester caps for the TX and RX tuning. No cable yet as I need to fill my coil shell. Otherwise, the circuit works exactly as advertised.

Oh, if you DO try to duplicate, try the AM mode as well.. on mine the performance gain is more pronounced there.

Thanks

DOn

[dfbowers]

My TSGL

TGSL

[dfbowers]

TGSL

Circuit close-up

[porkluvr]

... I replaced my 12V power source with an alkaline 9V battery and immediately noticed an increase in performance. I gained a significant (an inch or two) increase in depth, and the audio became slightly weaker, but longer and more drawn out. The thing that caught my attention was the increase in detection depth. Anyone have a 9V battery that they could drop in theirs to see if they experience the same?

Can you detail which variation of Ivconic's circuit you built? I mean, this thread is 165 pages long, and the circuit has gone through some upheaval.

I don't mean for you to post your schematic, but do you have a link to the page where it is?

(Throw me a bone!)

[dfbowers]

Rev .3 final by SB 8/18/2009.. (was that your latest?) There was a post somewhere with details on how to make and wire the coil, PCB, schematic and parts placement all zipped. I think it was labeled "Correct and tested" or something like that .

Don

[porkluvr]

Rev .3 final by SB 8/18/2009.. (was that your latest?) There was a post somewhere with details on how to make and wire the coil, PCB, schematic and parts placement all zipped. I think it was labeled "Correct and tested" or something like that .

Don

I'm sorry I wasn't more specific. I was mainly wondering if you employ a TX stabilizing FET or not.

I will try to find the zip file that you referenced.

Is there a stabilizing FET (or whatever it's called) in the your tx circuit? I was wondering because I seem to recall Ivconic as having abandoned that FET as inconsequential.

[dfbowers]

Here it is.. I just had it on another PC. I did use J107s for TR4 and TR5. Placement shows BF245Cs

[simonbaker]

Simon,

Yep, I'm using the LM7808. As you can see, it regulates down to 7.9V with a 12V source. The only difference in my circuit is that I am using one TL081 and one TL061 in place of the LM308s.. I need to order a pair of TL071s or TL081s I guess. I'm using cheap ceramic caps throughout except for polyester caps for the TX and RX tuning. No cable yet as I need to fill my coil shell. Otherwise, the circuit works exactly as advertised.

Oh, if you DO try to duplicate, try the AM mode as well.. on mine the performance gain is more pronounced there.

Thanks

DOn

Hi Don:

The LM7808 is supposed to need a 2 Volt headroom (dropout voltage) so normally it wouldn't be capable of regulating 8 volts output with 9 volts input. However, at lower currents, maybe you can squeeze a little less difference out.

It would be interesting to measure the voltage across the LM7808 to see what you're getting -- also the current (TGSL typically needs 30 to 40 mA).

Your result is interesting and worth investigating, even if a 9 volt battery is not a realistic use for this circuit (especially as it runs down). But it may be a clue to something.

By the way: what air depth do you get?

-SB