Can pinpointer detecting thin chain?

[Nupi]

Verander het Nakky


[ATTACH]29517[/ATTACH]

Ja, je hebt het goed veranderd .
Yes, you've changed it well.

ps. your Dutch is very good!!!

[nakky]

[QUOTE = Nupi; 189093] Ja, je hebt Het Goed veranderd.
Ja, je hebt het goed veranderd. ps. je Nederlands is erg goed! [/ QUOTE]



Thats much better than my English.

[Fabian]

New PCB

Hello Nupi. Congratulations for your great design, which soon begin to assemble. I like to give my personal touch to the PCB I do, so I made my own design based on that of Hadrianus, but according to the original diagram drawn by you.

I hope no errors!

Regards,

Fabian

[Nupi]

Hello Nupi. Congratulations for your great design, which soon begin to assemble. I like to give my personal touch to the PCB I do, so I made my own design based on that of Hadrianus, but according to the original diagram drawn by you.

I hope no errors!

Regards,

Fabian

[ATTACH]29544[/ATTACH]

Hola Fabian, si no te inporta lo miro mañana tranquilamente.
saludos.

[Fabian]

Tuurlijk, geen probleem.

Groet,

Fabian

Sure, no problem.

Regards,

Fabian

[Nupi]

Tuurlijk, geen probleem.

Groet,

Fabian

Sure, no problem.

Regards,

Fabian

這似乎是一個國際性的俱樂部在這裡！




它看起來不錯，就像你說的帶有個人色彩。它給了我滿意
我一直在賽道上幾個小時後。
看到別人享受它，以建立電路。


這是很好的，如果你不使用原來的線圈值與C2的值進行試驗。
約22-33NF值可以像2你try.Parallel連接，15 NF效果很好


我認為沒有錯誤在PCB
但我說的話，因為我經常出問題，你應該沒有任何附加價值。


唯一我注意到的是C2的在PCB的大小。這似乎是小的，我想。


It seems an international club here!!


It looks good, as you say with a personal touch. It gives me satisfaction
after many hours I've been working on the circuit.
To see that others enjoy it in order to build the circuit.


It's good to experiment with the value of C2 if you not using the original coil value.
A value around 22-33nF can you try. Parallel connection like 2, 15 nf works well.


I think there are no errors in the PCB
but you should attach no value what I say because I regularly go wrong.


The only what I noticed is the size of C2 on the pcb. It seems be to small, I think.

regards,

nupi

[Fabian]

Hello Nupi. Thank you very much for your reply. Yes, perhaps C2 is very small, I will change it.
I will try to reproduce the coil as close as possible to the original design, to avoid problems later.

I will keep you abreast of my progress.

Regards,

Fabian

[Nezocas]

Hi Nupi,

It still doesnt work
I made a few changes to component placement mo make it really small
I made a drawing of my connections but I think they are all good
Also tried your tuning chart. but no sucess

[Nupi]

Hi Nupi,

It still doesnt work
I made a few changes to component placement mo make it really small
I made a drawing of my connections but I think they are all good
Also tried your tuning chart. but no sucess

Hello Nezocas.
Can you measure the resistance between:
---point 1 and 1a/2 from the coil.
---point 1a/2 and 2a from the coil.
---point 1 and 2a from the coil.
The coil desconectate
do not worry, we will continue until Nupi pointer comes alive

[Nezocas]

point 1 and 1a/2
1.90 homs

point 1a/2 and 2a
0.65 homs

point 1 and 2a
2.30 homs

coil fully disconneted from circuit

[Nupi]

point 1 and 1a/2
1.90 homs

point 1a/2 and 2a
0.65 homs

point 1 and 2a
2.30 homs

coil fully disconneted from circuit

The resistance of the coil are pretty good.
I think, it might be dificult for you to get the proper components.
C2-47nF is too big. But we go try with your components.

Replace resistor R3-2,2k for a 1k resistor and try it out.
Set the voltage values only with R2.
Now have the engine running somewhere when adjusting.

[Davor]

I'd say your Q factor is too good. No kidding. This oscillator is very touchy on the coil Q and transistor gain, so the trimmer may not compensate if both are too good. You may try 100k in series with a trimmer, or you may go for a lower frequency by increasing the tank capacitance.

[Nupi]

I don't think that the Q factor is too good. 47nF is for C2 is too high.
Adding 100k will not help, I think.
Lowering of R3 to 1k gonna help. If he has further the circuit well built than it must work.
The performance will be less. This is not in theory, but it is tried out in practice.

[Nupi]

Hello Davor, b.t.w, how do you progress with the Colpitts oscillator and how about the push button stabilisation?

"I thought of the automatic tuning for a pinpointer, but then I realised that even the commercial ones
are doing it kinda semi-automatic. Otherwise the clicker trick for improving sensitivity wouldn't work.
When you switch it on it goes into a ~2 seconds cycle of self-tuning, and then it is ready.
Point is that if you let the stabilising circuitry do it's thing all the time,
you in effect get a motion compensated device. If you go with extremely slow motion compensation,
it takes forever till it stabilises. So how about a push button stabilisation.
In a way it would provide some kind of ground balance as well."

[Nezocas]

Hello nupi,

I have changed R3 to 1K and set the proper voltages with R2 100K pot with L2 (lead nº1 from coil out).... then resolded it
Adjusting sensetivity with R1 still motor
Also no movement from motor, with or without metal over it

Also tried to replace C2 with: only one 10n cap / 2 paralel 10n cap and also 3 10n capacitor ... but no joy

I only get 1 second of movement from motor, connecting or disconnecting L2 (lead nº1) from the powered ON circuit

Tomorrow will try diferent settings

Best regards