My IB

[Gervm]

Here is circuit of my IB. It`s simple but really works.
Oh. Help to insert image from my HDD...

[erolunall]

Hello
additional options
Manage attachment at the below o page when you post replay.
look bottom of page

Regards
Erol

[Qiaozhi]

Here is circuit of my IB. It`s simple but really works.
Oh. Help to insert image from my HDD...

You can only attach items after you have made at least one post. You have just done that, so please try again.

[Gervm]

[img]D:\Металлодетекторы\IB\CNY 17\IB[/img]

[Qiaozhi]

[img]D:\Металлодетекторы\IB\CNY 17\IB[/img]

That's not how you attach an image. I suspect you have simply dropped the image into your post, but this will create a link that no-one else can access.

Click on "Post Reply" and scroll down until you a see a button labeled "Manage Attachments".

[Gervm]

English is not my native but I solve

[Qiaozhi]

Is this your own design?
What are the performance details?

[Gervm]

Design is mine. I`ve been using it for 3 years. I can give all details about it. I only need time for it. Photo of this unit...

[WM6]

Nice!
Gervm, can you suggest western replacement for operational aplifiers you use (not marked OP1, K140Y)?

[Gervm]

K140YD17A is close to OP07. Will be better if you`ll use OP27 but in this circuit you can use almost evry OPAMP

[Gervm]

Photo of PCB without coil capacitors

[lucifer]

Good job, Gervm!
It's really good to see an IB project. Seems most of the members are focused on PI designs.
What is the performance? Is discrimination good?

[Gervm]

With large coil it detects large and medium objects enough deep. For example it can "find" my car at the distanse more than 3 metres (~3,5m).
I`ve got Garret 2500 pro with large coil but it cannot. It`s also rather sensitive to litle objects. For discrimination I use two diferent coils. One for all metals - other for non ferros. Sorry for my Enlish.

[Patrick]

Good job.

Gervm, what is use P1 and R5 ?
What is the frequency ?
What distance for a coin ?
Thanks!

[Gervm]

P1 really consist of 2 resistors connected sequentially - they tune phase. One does it roughly anoter does it smoothly or you can use one good many turns resistor as shown in circuit. R5 - 470kom. At the table it can "find" coin at 25-40 santimeters. It depends of diametre of coin and quality of unit and its head. Working requency is 8 kHz.