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

[ionut_mtb]

Hi，Do me a favor And tell me why the coil err，Thank U.[ATTACH]53721[/ATTACH][ATTACH]53722[/ATTACH]

Hello. First adjust delay D0 to D30. Did you measure the coil? Hod did you build the coil? Put a picture of the pcb.

[HAPPY]

Thank U my dear friend，I've built the coil and conect the pcb，but when i put the metal over the coil and hold still is no sound,move the metal to cut magnetic field is OK.I build in picture A，hat's the reason for this?Another question, picture B and C are felezjoo pi smd？who has the Lay and Sch?

[folharin]

solution coil error substitute r11 por resistor 80r +trimpot 1k.....c11 tantalum=2.2uf eletrolitico bipolar

[gurdal]

[Mr.Jaick]

hello everyone
I just build this detector (FPI) and i have two questions:

1) If i use an aluminum box for the circuit and connect it to the Shield point (GND), will it detect it's box?
or does the metal box(connected to GND) effect it in a negative way?

2) should i shield the coil with graphite?
a 50cm coil

thank you

[amindevil]

Dear Jaick
Shielding the pcb with metal box is not a good option.instead you can add a pcb and solder negative of the fpi to it. It really helps
Adding graphite to the coil makes it much heavier

[Mr.Jaick]

Dear Jaick
Shielding the pcb with metal box is not a good option.instead you can add a pcb and solder negative of the fpi to it. It really helps
Adding graphite to the coil makes it much heavier

thank you amindevil
I conducted some experiments myself so results are:
i put some different metals in a plastic box and completely shielded it with thick aluminum foil then connected the foil to the pcb shield point with a long wire
to test it on the coil

it detects the box
i tried without the extra metals, still detects it's shield point (GND)

so my problem is that i need to put the lcd in front of me to see some data
and the only way that i know to do with my available handle is down blow


it's a card board model of a box i want to use
i worry if the PCB would interfere with coil or not
one guy over here did the same thing with a bigger plastic box and says it won't interfere if you are careful with angle and distance
I don't know what to do

[Mr.Jaick]

my coil is 50cm / 18turns spiral / 0.75mm enameled
auto delay is +21
the discrimination does not work, shows every thing as NON-FE
i just want to know if it's not a coil problem then i glue my coil windings and make it rigid with confident
please let me know

[amindevil]

Dear Jackie
A friend of mine have Don that I mean he put the device on the handle like you did and it was not detected

[etwert]

new pcb drawing...
http://forum.jokerdedektor.com/pi-pu...msg834/#msg834

Dear selim, in this pcb 7805 does not receive power supply

voltage. What is the reason. Is there a correction.

Sincerely, etwert

[bernte_one]

link broken
pls put picture direct as forum upload

[etwert]

[bernte_one]

ahh ok thx, seems mustafa design, (also made a version of pim2)
maybe you have to turn 7805 regulator 180degree in orientation?

[bernte_one]

ok i looked falezz layout from mustafa,7805 is ok
seems interesting coil driver BDX54C, 7812, IRFP460

also use of lf356 instead lf357

[etwert]

Thank you for the information. What is the post number of mustafa, please.