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

[liudengyuan]

This is a restricted hex, detect a stability is far from xr 71 didn't good, the best circuit is xr 71,

[ossman22]

Spent some times on Iranian forum pages and found a few clips that a few users uploaded there.
Among those just 3 of them are considerable other videos were unclear.
There were no documents or evidence to show device iron rejection clearly. Just written claims without any proven documents or any acceptable evidences.
Even its designer never published any video or picture or any considerable document of its own device !!!!!!!. But written claims and exaggerated claims by few fixed members without any acceptable evidences.

I couldn't find any evidence to see iron rejection ability during work.
(Perhaps I can not understand Farsi language well. If this is a problem, Iranian friends should tell us)

Anyway, here are 3 videos. 2 of them are clear done at outdoor (detection depth) without iron rejection.
The third one seems a person trying to show iron rejection with an iron pliers and a gold coin sealed on a cardboard. (I'm afraid. Not sure)
Until now I can say do not count and rely on iron rejection option not at all.
(I'm not trying to disappoint you. Just telling you what I saw there)

But other function seems to be good.
For example felezjoo pi has automatic and manual settings especially interval, pulse width, frequency also sensitivity and able to adopt several sizes of loops.
Here are videos. 2 are 3gp format and one is mp4.please click on links. just valid for 7 days

test with flat spider 50 cm diameter coil

test with 1x1 meter square coil

iron rejection test

[Qiaozhi]

I couldn't find any evidence to see iron rejection ability during work.
iron rejection test

Hmmm ... I watched the video, and the results were pretty inconclusive regarding iron rejection. Basically, it didn't appear to work very well, if at all.

I get the impression that this detector is designed specifically for finding large buried targets, such as those you might find in the desert. It doesn't appear to have been the intent of the designer to cater for much smaller targets. Obviously it's very difficult for people in Iran to import detectors from abroad (at least at the moment), so having a home-grown unit will create a lot of interest. Perhaps the rave reviews are simply the result of a few over-enthusiastic constructors.

[mohandes]

Hmmm ... I watched the video, and the results were pretty inconclusive regarding iron rejection. Basically, it didn't appear to work very well, if at all.

I get the impression that this detector is designed specifically for finding large buried targets, such as those you might find in the desert. It doesn't appear to have been the intent of the designer to cater for much smaller targets. Obviously it's very difficult for people in Iran to import detectors from abroad (at least at the moment), so having a home-grown unit will create a lot of interest. Perhaps the rave reviews are simply the result of a few over-enthusiastic constructors.

hi
what is your idea about this?tell us please?is it good for make?

[liudengyuan]

Felezjoopi I ever did, and cannot effectively refused to iron, because the area of the size of the iron will of different, I designed the new PCB,

[eclipse]

It was clear from the start it cannot discriminate. I will order some boards to try and make it I guess.

Looking at the schematic I don't see a reason why the device would need 18V battery, i think it should work with 12V at the least (when battery is discharged)

[mohandes]

It was clear from the start it cannot discriminate. I will order some boards to try and make it I guess.

Looking at the schematic I don't see a reason why the device would need 18V battery, i think it should work with 12V at the least (when battery is discharged)

so.which Pi i make .just have disc and deep?

[ossman22]

comparing to analogue metal detectors

Comparing felezjoo pi to delta pulse or xr71
I think the designer of felezjoo got idea from "Universal PI Micro" and his device based on that design

Detection depth should be almost same in felezjoo and other analogues because when consuming 12 volts 100 mAh we can estimate detection depth.

Analogues like delta pulse and XR71 both have frequency, delay, sensitivity, pulse width adjustments also other settings.
So functions (settings-adjustments) in both felezjoo and other analogues are same.

Right now, iron rejection or metal discrimination option in pi metal detector is just a decorative subject. It is too soon to talk about.

If software ( I mean codes) written properly with user friendly panel, then felezjoo pi is better than analogue type because it needs less components also settings are digitally. as a result device will be much more stable than delta or XR71 or other analogues.

I think step by step after improvements, it will become more interesting metal detector than others. By the way it has some settings that I don't see in others like clone pi or chance or …..
We must wait for practical reports from users but seems felezjoo is better.

[eclipse]

As promised, here's the schematic. If you spot any errors, please let me know and I will correct them.

There's an error where R1, Atmega pin 11, C1 and LCD pin 3 are connected.

Atmega pin 11 connects to R1 only. The 2nd pin of R1 connect to the other components. (C1, LCD pin 3)

[eclipse]

C7 should be connected to GND and +5V, on the schematic is connected to PIN 17 of Atmega and R18

[Qiaozhi]

There's an error where R1, Atmega pin 11, C1 and LCD pin 3 are connected.

Atmega pin 11 connects to R1 only. The 2nd pin of R1 connect to the other components. (C1, LCD pin 3)

Thanks for taking the time to check over the back-engineered schematic.
I can confirm that this is indeed an error. It appears that I erroneously placed C1 on the wrong side of R1. This part of the circuit is used to control the LCD contrast.

C7 should be connected to GND and +5V, on the schematic is connected to PIN 17 of Atmega and R18

I can confirm that this is also an error. C7 (100nF) has been moved from pin 17 of the Atmega.

Please find the updated schematic attached below:

[eclipse]

Thanks, looks good.

[mohandes]

no body here make this

[eclipse]

I will be making FelezJoo next month, im waiting for PCBs and parts to arrive.

[nick holas]

i m waiting too for parts,will post when finished