TESORO GOLDEN SABRE

[ivconic]

he uses some kinda chinese flux https://www.aliexpress.com/item/3276...chweb201603_55

it is absolutely neutral pasta.

I don't think so. On the left side of his photo i see very clearly the calamity!
...
What you are referring on is "Kalafonium". It is alright, i am using it too when want to coat the pcb.
I am putting few grains of it in nitro resin and wait to completely dilute.
Than i use small brush and "paint" the pcb with it. Smear it equally all over the pcb surface, both sides.
Than let it dry for several hours.
And that's how i get perfectly protected and shiny pcb.
Kalafonium also helps a lot in soldering process. Acts as perfect "katalysator" in process of joining soldering with copper surface.
Later on it preserves pcb surface from any moisture and oxidation.
Perfect in diys!
I found nothing better than that so far.

http://www.loging-ks.com/1798/188747/0/ShowProduct/Kalafonium

[kt315]

But i think i discovered the main problem at his nice work already.
It is the greasy welding pasta.
Worst calamity you can imagine in our line of works.
I can not resist not to laugh, when see "pro" dil sockets there!!!
I wonder even if nitro will solve the problem there!

he uses some kinda chinese flux https://www.aliexpress.com/item/3276...chweb201603_55

it is absolutely neutral pasta.

[kt315]

i did it the amplitude with 4.7k is 10V and has a huge distortion, not as good as 50k

no one told you the colpitts oscillator gives clear sinusoidal signal. you pay by distortion for simplest ONE-TRANSISTOR-circuit.
now answer it was with R and C you added or not because you wrote:

i tried to troubleshoot the circuit and found out that TX circuit does not work anyway
why? because transistor colpitts oscillator(tx circuit) won't work without collector load and base bypass capacitor, in this case(this is a common_base amp) so i added a 10k pot between collector of 2N2907 and ground and a 220nF cap between base and +8 supply rail and it worked, no surprise

new discoveries await you ahead just you are learning electronics basic on-the-run.

[ionut_mtb]

There is a soldering wire with melt rosin core, so you don't need anything additional.
Actually i don't know the proper term, there are various names for it over the internet.
I am using mostly 0.8mm wire with melting rosin core, something like this:

https://www.google.rs/search?q=solder+wire+high+quality&client=opera&hs=JkJ&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjezuDfhLrnAhUvlosKHeVqAkMQ_AUoAXoECAwQAw&biw=1920&bih=970

Later on i am using nitro resin for cleaning extra flux and eventual impurities around the soldering points.

I owned multicore soldering wire (high quallity) with flux core. did a very good job but is quite expensive. You don’t need extra flux. After i finished this wire i’ve bought from aliexpress sn60pb40 2% flux but i can see that the quality of the soldering is not the same as before. Now i want to order something made in Germany, named alpha fluitin 60sn38pb2cu 3.3% flux as i found 1kg roll at half price. Usually i clean my pcb with isoropilic alcohol.

[ivconic]

yes sir that's for soldering but i cleaned it with gasoil spray and then clean the gasoil with precision electronics cleaner spray no problem , it says on the cap "clean after use to avoid unwanted connection"
do you have any better solution for soldering , i'm welcoming

There is a soldering wire with melt rosin core, so you don't need anything additional.
Actually i don't know the proper term, there are various names for it over the internet.
I am using mostly 0.8mm wire with melting rosin core, something like this:

https://www.google.rs/search?q=solder+wire+high+quality&client=opera&hs=JkJ&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjezuDfhLrnAhUvlosKHeVqAkMQ_AUoAXoECAwQAw&biw=1920&bih=970

Later on i am using nitro resin for cleaning extra flux and eventual impurities around the soldering points.

[ivconic]

Those machined pin dil sockets gave me many problems in the past. Haven't used them in years. I switched to these[ATTACH]49364[/ATTACH] I don't have problems with them.

Exactly, me too.
Either they don't make it anymore as they made it in the past... either i have constant bad luck to obtain the worst quality.
So i switched to the same ones as you. No problems anymore.

[kt315]

i'll release the pcb file after clean up that stupid mess and make it more compact
is there any thing that will increase performance to add on pcb?
like that bf245 jfet blow the 2n2907 transistor in some schematics, i don't even know what it actually does

jfet stabilizes the amplitude of tx signal. you have to see that. certainly you do just amputated version of full tesoro.
tgsl is TGS 'light' ie amputated tesoro to compadre/amigo schematic.

[Mr.Jaick]

It is an LC circuit. The LC stores energy and then 'kicks back' this energy into the caps.

Check on how the Spark coil ignition system works in your car. With an inductor and capacitor the ignition system converts 12V into 100's of Voltages to create a spark across the plug's gap.

yeah i need to go back in fundamentals on oscillator and experiment them on bread board, thanks

[Mr.Jaick]

Agree with you my dear Quasishoshy!
Very nice pcb put together.
Very neat work.
But when i saw that piece of schematic he posted... well!

i'll release the pcb file after clean up that stupid mess and make it more compact
is there any thing that will increase performance to add on pcb?
like that bf245 jfet blow the 2n2907 transistor in some schematics, i don't even know what it actually does

[Mr.Jaick]

If i am not mistaken in what i see, if that is not just your spouse's make up set left there randomly; than your pcb is greased very well, all over the place and conducts randomly everywhere.
Only cure now is nitro resin bath. For stay and soak for 20 minutes deep in nitro resin. Later on brushed up good and let to dry good and long on fresh air.
And all over the sudden; that pcb will start working just fine!
(Assuming that those strange modifications at TX stage are making any sense)

yes sir that's for soldering but i cleaned it with gasoil spray and then clean the gasoil with precision electronics cleaner spray no problem , it says on the cap "clean after use to avoid unwanted connection"
do you have any better solution for soldering , i'm welcoming

[Mr.Jaick]

OK guys, calm down.

Also, I think you're all being unduly harsh towards Mr.Jaick. Personally, I think he's done a pretty good job of creating his own PCB.

thank you very much Mr, Qiaozhi , honestly this forum has such helpful people in it such as Mr,ivconic

[Mr.Jaick]

Mr Jaick

Don't even waste your time if you cant understand a simple Colpitts oscillator. This topic is not bad information! You are lazy to read and cant make a real PCB.

People here arguing with you are wasting there time also, explaning to you some really obvious things, many of us made several TGSL by the info posted here, if you are not able to make it work than it's your problem not others!

i don't know why are you being so angry and anxious today!
people are here to help each other with their knowledge , there is no time wasting
and yes i'm a beginner at metal detector design but not a lazy person i've read a lot of information on here and other places before i ask a question
and if you think you can understand such circuit please explain it to me clearly then i won't be a fool on colpitts oscillator , explain that pnp transistor gain control and dc bias ,thank you

[Mr.Jaick]

Be a sport, waste just 2 minutes of your precious time, change your 4k7 with 47k and see what happens.
If supplied with 8 volts and than if supplied with 5 volts. 12 volts in your case.
Use oscilloscope and analyze the signal amplitude.
Than continue to be a sport just for 2 minutes of your precious time more and inform us here about your revelation.
Many thanks in advance!

i did it the amplitude with 4.7k is 10V and has a huge distortion, not as good as 50k

[Mr.Jaick]

Do you have oscilloscope?
Can you tell the difference between DC and AC?
Do you understand the "Vpp" meaning?

i have oscilloscope
i know the difference between dc and ac as well as the Vpp

[waltr]

5000 volts on my Opel.
Don't ask me how i know this.
My curly hair shows it all.

Yes, I missed a zero, should be 1000's of Volts
.

hi again Mr.Ivconic you're right the original schematic is fine i returned the circuit back to default and it fortunately worked, well many thanks to you guys
but i don't know why it did't work on bread board , i checked the connections many times, very strange

Break boards can have poor connections so a circuit just doesn't work.
Good you re-did it and now it is working.