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

[ivconic]

If someone had told me this 20-25 years ago; I could hardly believe it.
But today I am 100% sure of what I am going to write.
If we take all the existing projects on the forum and the thousands of people who participated in DIY and often gave their experiences, opinions,
often reports on failure and problems on the forum... today I am 100% sure that over 70% of failures are related to fake components!
The other 30% of failures goes to ignorance, incompetence or inexperience.
I sign this statement!

[cristiano.sar]

If someone had told me this 20-25 years ago; I could hardly believe it.
But today I am 100% sure of what I am going to write.
If we take all the existing projects on the forum and the thousands of people who participated in DIY and often gave their experiences, opinions,
often reports on failure and problems on the forum... today I am 100% sure that over 70% of failures are related to fake components!
The other 30% of failures goes to ignorance, incompetence or inexperience.
I sign this statement!

That is true, for example, I rebuilt my TGSL and coils for it a lot of times to find some years later that the problem with low depth performace was related to fake components.

[Aziz]

Hi all,

I have some original LF357 (DIP) somewhere. They must be at least 20 - 30 years old now.
Also some TL071, TL072.

Is it really difficult to get the original parts today?

[Aziz]

https://www.youtube.com/watch?v=cOC9aj_jtwo

https://www.youtube.com/watch?v=6CHHnWKgVrA

Even the very cheap 741 op-amps get faked:
https://www.youtube.com/watch?v=gueH9v-RipI


WTF, all fake!

[Fadel saleh]

اريد اطلب منك الكود. الخاص بلمعالج v2.40.hex

[latcakir]

Is it possible to perform integrated testing of the LF357 with a V/I curve tracer?

[ivconic]

https://www.youtube.com/watch?v=cOC9aj_jtwo

https://www.youtube.com/watch?v=6CHHnWKgVrA

Even the very cheap 741 op-amps get faked:
https://www.youtube.com/watch?v=gueH9v-RipI


WTF, all fake!

Welcome to my world of pain!

[sabios]

Has anyone noticed that the Felezjoo is fast at detection but therefore more unstable? With a small change, it becomes slower but more stable. I'm using a 45cm coil for testing. I recently buried a can of chili peppers 40cm deep and it detected it.

And of course, this is the version I modified.

[sabios]

This is a video I made; I should clarify that I'm not a professional at this. In the video, I clearly showed that the can is 70cm high. What do you think? As I said, it's very stable, although in this version, as you can see, it's a bit slower, but that makes it more stable than it was before.
Incidentally, I also used an XH-M404 With Display for this detector to stabilize it at the correct voltage, and I must say it works wonderfully with it.

https://www.youtube.com/watch?v=DSUlxyS2rcs&t=4s

[Ruben2000]

Hey experts! It looks like the Felezjoo is working well.
What firmware are you using?
Could you share the specifications of your coils?

[sabios]

The coil has a resistance of 1.6 ohms and an inductance of 350uH. I'm using the full version 3.35, but I should clarify that I made some adjustments since most of the problems were related to that. Finally, to make it a little slower and more stable, I added something to the board, which is what makes it run slower but very stable. Tomorrow I plan to make a 50cm square coil to see the differences between this one and the other.