Hi

[ivconic]

No such thing.
Especially not for 6v power supply and perfboard mess.

[Hach]

Thanks guys for your advice.
I have questions.
I test the board and its work and there is a detection to 5cm only but my battery so week it's read on multimeter 6v also I get continuous beeb is it because low voltage?
I will be very happy if Ivconic put configuration processes in step by step
Thanks again for supporting

[kt315]

George
he has to learn LUT technology. that is simple way, does not waste money and get good result. then he will do any project having just black-white pcb picture.
sorry i do not know similar videos in english sector because do not know the name of it in english.

https://www.youtube.com/watch?v=NJTeIALlztI

[Qiaozhi]

The board looks terrible I know

If you don't want to use a PCB, then a better alternative than protoboard is to use stripboard (Veroboard). You can design the layout easily with VeeCAD.

https://veecad.com/index.html

[Hach]

Thanks God I get the first sign of life
The board looks terrible I know
But it's working and I get first beeb tomorrow I think still a lot of something to do with
Thanks ivconic I hope I can configure it as well

[timekiller]

N77 Spray Graphite , this is the best in my opinion. But at the moment it is not connected, the board is on the work table and I am working on it

[kt315]

what you used for shielding? kitchen foil? sattelite cable foil?

[timekiller]

Mine SMW is ready. Very deep, 1 euro coin about 45-50 cm. But discrimination is very bad. It eliminates ferromagnetic metals, but the depth of the non-ferrous metals also drops significantly. I experimented with TL084 LF347 LM324.... TX is 0.8 mH DD from elliptic coil from old project. I can't download less than 10 kHz because the work is inadequate poor .
There is probably something I need to do to improve discrimination.

[ivconic]

Ah protoboard!

[Hach]

Working in progress
Please ivconic check these images
And tell me if transistors in there right places
Also that big tantalum in its+ place

[ivconic]

[ATTACH]49422[/ATTACH]
Hello the green spot in attached image
Is it 27kohom or 2.7kohom?!

It is 27k as noted.

[ivconic]

Sorry I mean in schema 3.9k in pcb 1.8k!!
Which one correct?

That's good question.
Differences are due possibility to use various coils with it.
Both are correct, since you'll have to check both and see which one is giving you better behavior.
First obey what you see on pcb, those values.
Than when you test detector with coil, checking Disc, GEB ... you'll see if you need to correct that resistor.
So, obey the pcb values , from pcb draw you posted.

[Hach]

Also r20 is it 3.9k or 39k
Its not same in schema and pdf pcb!?

Sorry I mean in schema 3.9k in pcb 1.8k!!
Which one correct?

[Hach]

Also r20 is it 3.9k or 39k
Its not same in schema and pdf pcb!?

[Hach]

Hello the green spot in attached image
Is it 27kohom or 2.7kohom?!