TESORO GOLDEN SABRE

[ivconic]

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.

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!

[ivconic]

WAIT A MINUTE!
WTF is this on photo?

[ivconic]

Could it be... by really unfortunate occasion... the oily conductive grease for welding gutters and various metal sheets!???
Or it is just put there for fun?

[ivconic]

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)

[waltr]

yeah that is a standard type colpitts oscillator
now i'm going to change things to default and see if there'd be any differences (hopefully) i'll come back with results
but i have a question : how a transistor colpitts oscillator would oscillate at 16Vpp by using +8V supply??
that's pretty strange to me...

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.

[ivconic]

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.

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

[ivconic]

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!

[SVEN1]

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

[Mr.Jaick]

W. Lahr NEVER made mistake on this, period.
Each diy that i made according to his retraced schematic; works alright from the first switching On.
W.Lahr is rock solid!
Why is this difference?
Due different voltage supplying the oscillator, simple as that.

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

[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.

[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

[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]

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]

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]

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