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

[Kostasp]

hi thanks for help all, here some photo and some in the post #1803 thanks.

[karim1980]

hi thanks for help all, here some photo [ATTACH]44372[/ATTACH][ATTACH]44373[/ATTACH][ATTACH]44374[/ATTACH][ATTACH]44375[/ATTACH] and some in the post #1803 thanks.

your ici lf357n not original
I tried this version of ici (m54af LF357N) is fake ici . Coming from China or singapor
try lf356 or tl081 To test the device initially you get an original piece

[karim1980]

http://www.geotech1.com/forums/attac...9&d=1491156041

[Kostasp]

i have try and m61af lf357n its face and this? i have try all this and ca3130 , and with out lf357 steel works and says error coil

[karim1980]

18kho not 12ohm

[Kostasp]

thanks i look tomorow and ia will tell you if i have any change.

[Qiaozhi]

your ici lf357n not original
I tried this version of ici (m54af LF357N) is fake ici . Coming from China or singapor
try lf356 or tl081 To test the device initially you get an original piece
[ATTACH]44376[/ATTACH]

Sticking them in polystyrene isn't going to help either!
Static electricity will kill ICs, or at least weaken them so that they die later.

[kt315]

you always can sort any opamp on state work-burnt by special tester.

i have try and m61af lf357n its face and this?[ATTACH]44377[/ATTACH] i have try all this and ca3130 , and with out lf357 steel works and says error coil

[Arionas]

LOOK MY PHOTO Kostasp

[tony3]

Hi, I am sorry if this is a bit off topic but it is the nearest thread to to question I want to ask. I am building an ROV and would like to have metal detecting capabilities. I am interested in buying a Surf Pi kit and try and adapt it for ROV use. I have a 75m tether with spare twisted pair cat5 cables would the distance between coil and PCB (75m) be to great for the Surf Pi to work correctly.
PS I am new here and have limited electronic experience.

Thanks Tony

[Kostasp]

the resistor is 18k then its ok

[Kostasp]

when I press button up but this message is for every coil I connect

[karim1980]

[ATTACH]44401[/ATTACH] the resistor is 18k then its ok

[Kostasp]

it is 18k 1%

[Kostasp]

and an other multimeter says 18k and from internet Resistor Color Code Calculator.pdf