TESORO GOLDEN SABRE

[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]

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

[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.

[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.

[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=solde...w=1920&bih=970

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

[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=solde...w=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.

[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.

[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.

[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...uct/Kalafonium

[ivconic]

This is how it looks like when coated with kalafonium.
This one is most recent pcb, hanging and drying:

[kt315]

What you are referring on is "Kalafonium".
---
no it is not. i bought it for 'probe' and it is kinda from petrol made like semiliquid paraffin.
do not like it because does not dissolve good by alcohol on cleaning. colophony is much better.

[ivconic]

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.

Indeed they are going crazy lately with hot prices.
This becomes very expensive hobby lately.
I am using what i can obtain at the moment.
Right now i am using these:

[ionut_mtb]

Later on it preserves pcb surface from any moisture and oxidation.

Agree with you but not this. From what i know, in time, flux residues and cause corrosion on pcb’s. Also not good on precision circuits.

[Qiaozhi]

The best thing to use is PCB lacquer:
https://www.amazon.co.uk/30235-AA-AM...0901123&sr=8-4

[ivconic]

The best thing to use is PCB lacquer:
https://www.amazon.co.uk/30235-AA-AM...0901123&sr=8-4

Back in 2004/5. on Malta i used something similar.
There was Maplin Electronics shop there and i obtained most of the material at them.
So once i bought something similar.
It is alright. It is doing the job.
But i noticed that it needs bit higher temperature adjusted at soldering iron, to easy solder the parts.
Coating with calafonium is melting and "opening" at lower temperatures.
Maybe is just because of that spray type that i used than. Maybe is not the same case with all.