TESORO GOLDEN SABRE

[porkluvr]

Hooray for finding LM308.

BS107 MOSFET will be NO good!

I think 2N3819 is a hit-or miss deal. Some will work OK, and some will not. You should look for something better.

Try to find 2N5484, 2N5485, 2N4393, J112, J113.

k246 (2SK246) should work OK, but you do need to twist 2SK246 leads to where they match the PCB.
Here is good place for datasheets.

edit: this is a re-edit. Some of the FETS listed here have leads that are 180 degrees away from the others and you should download and review appropriate device datasheet, and adjust, before you use these devices as substitutes. DONE.

[matrix]

Hi
Yes, it is very stable, now i have to find problems that in disk mode, sensitivity is very low and in all metal mode detects a nickel 1.5cm coin from 20cm
my be hand made coil is not effective otherwise , jfets 2n3819 are not suitable this place.
after these have solved, will try with similar parts of course
maybe...
op07 , op77, tl081 , tlc271

[satdaveuk]

Hi
I found the LM308 to be the most stable, tried the 0p07 which gave me instability , but saying that different builds will have different results due to there been so many varibals in the rest of the build.
So worth experimenting with different parts but keep in mind what works for one persons build doesn't mean it will be success for yours and visa versa .

[matrix]

hello friends
i came back with full hands, obtained lm308 from an old dealer in an old store...
Nice
but jfets are not available yet
bf245
bf256
j107
tis75
2n5458
bfs76
and etc...
i just find these : k246----2n3819----bs107(bs107 was a dealer proffer).
And now again need some friend's opinion who guides beginners at all.


best wishes
M

[matrix]

dfbowers and porkluvr , thank you .
i am going to provide some parts with your helpful answers today.

best wishes
M

[porkluvr]

... sensitivity and disc are both having problems and noises are strongly available.
may be because of my replaced parts.
may jfet 2sk246 is not good replacement for bf245, or lm308 cant replaced by ne5534
anybody can help?
best wishes
M

Ouch. Um huh you answered your own question.


The FET replacement would probably be OK (but not the best) but you need to swap the pins.

BF245 goes DSG looking at the bottom with flat side up. 2SK246 goes SGD.

NE5534 is a good amplifier but not for where you're wanting it. I'll add OP07 to what Don suggested you could try.

Even better would be OP08 or LT1008 (but "good luck" with finding these, as they really are 'exact' replacements for 308.)

[dfbowers]

OK. the problem with audio solved, using a mod circuit of other TESORO schematic (using bd140).
but sensitivity and disc are both having problems and noises are strongly available.
may be because of my replaced parts.
may jfet 2sk246 is not good replacement for bf245, or lm308 cant replaced by ne5534
anybody can help?
best wishes
M

It might be helpful to show which schematic you are working from as there are so many. The most common FET used in the TGSL is a J107 but bf245a,b,c work. I have even used an MPS102 without any noticable difference.
For LM308 go with a TL061, (Low power) TL071 (low noise) or TL081(low cost) .

[matrix]

AUDIO MOD

OK. the problem with audio solved, using a mod circuit of other TESORO schematic (using bd140).
but sensitivity and disc are both having problems and noises are strongly available.
may be because of my replaced parts.
may jfet 2sk246 is not good replacement for bf245, or lm308 cant replaced by ne5534
anybody can help?
best wishes
M

[mazari31]

good day everyone I just finished my tgsl may the problem
and a depth part 1 euro 13 cm may following a booming mass as a pence
about 30 cm made coil House Jet mi has the place
of r45 24 k r48 r51 220 k

[dfbowers]

If your 22 OHM resistor and MPSA13 are getting hot then there is something else wrong. If built correctly duty cycle of the audio signal is normally very small.

[matrix]

hello all
i made this tgsl (posted page1).
but audio is poor and its parts (22 ohm and mpsa13)are hot when using an 12v power supply. will this problem empty the battery if use it?
a 100ohm resistor is in series with 8ohm speaker. how can use a piezo?

best wishes
M

[danev]

Maybe - this is a stupid question and I am just very inconsiderate, but still ...
Where you can see TGS graph in format Protheus (fomat .dsn)? Thanks in advance!
Sure, I can do it myself, but if someone has done before me, why waste time in vain?

[Biogas]

Thx brabra!

[brabra]

Hi Eduardo!

I buyed 4 piece 10 uF capacitor, but in the Store was just 50V capacitors in this range.
Is it problem?

Thank you!

No problem

[Biogas]

10 uF Capacitor

Yes.

Hi Eduardo!

I buyed 4 piece 10 uF capacitor, but in the Store was just 50V capacitors in this range.
Is it problem?

Thank you!