felezjoo PI(the best pulse induction metal detector that I made until now)

[MDfanatic]

It's a firmware issue, if you uploaded the "nocount" version it is unstable.
The most stable version is the one with the counter.

[Hessen.ali24]

Hello, we have encountered a problem, this device is not stable on soil, does anyone have a solution to this problem?

[folharin]

exactly..I got success in the detector by replacing this resistor mentioned r10 by a potentiometer!

[useus]

alternatively you can replace R10 with a potentiometer or trimmer

[Ruben2000]

[QUOTE = LUPENGR29`; 287988] ?Qu? resistencia? [/ QUOTE]
It refers to this.

[LUPENGR29`]

my answer is to help those who are building! the integrated lf 357 is false in all countries. to adjust the circuit to simply be operational it is necessary to put a 5k potentiometer in place of the resistor

Which resistor?

[folharin]

my answer is to help those who are building! the integrated lf 357 is false in all countries. to adjust the circuit to simply be operational it is necessary to put a 5k potentiometer in place of the resistor

[Ruben2000]

I want to buy this LF357 but it does not ship to Latin America, will there be a friend who can send it to me?

[LUPENGR29`]

Good evening, I made the felezjoo pi it works normally but the 7812 burned but I did not have another 7812 and I installed the 7809 and the pulse works fine. Should I leave it or will it create a problem in the circuit?

Check the negative of the cepacitors and you will find out why it became burned :P .... normaly no so burned....

[Omerta 1312]

Good evening, I made the felezjoo pi it works normally but the 7812 burned but I did not have another 7812 and I installed the 7809 and the pulse works fine. Should I leave it or will it create a problem in the circuit?

[waltr]

Cannot tell just by looking at it, you will have to test it, too many fakes.

I agree, need to test.
They do not look good. The Motorola logo seems a bit blurred which can be an indicator of a fake.
Also, the surface on the chips looks rough.

[6666]

[ATTACH]55024[/ATTACH]

Hi guys can you tell me if this ic is good for project i mean copy or original

Cannot tell just by looking at it, you will have to test it, too many fakes.

[salim]

Hi guys can you tell me if this ic is good for project i mean copy or original

[Qiaozhi]

You are funny.... anyone else who want realy help?

What type of ferrite?

It doesn't matter what type of ferrite. It's simply a 10uH RF choke in series with the power line.

[LUPENGR29`]

You are funny.... anyone else who want realy help?

What type of ferrite?