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

[samii]

Hello
if you will use IRF740 will not get coil error or open device first and connect coil.

[basellafe]

Ihave one i will try it

[freso]

what cuse error coil. all the time with many tries lhave error coil

The problem is from lf356 ... You have to try some lfs i have the same problem ... Or order an original lf357

[basellafe]

[basellafe]

I cant find in my country lf357 put i have ua741 and the same result

[basellafe]

[freso]

I cant find in my country lf357 put i have ua741 and the same result

Even me cant find them here in my country and dont have a way to order them but here you can order original one: http://www.ebay.de/itm/2-Stuck-2-pie...YAAOxyOalTZn15. The opamp bandwidth must be 20 mhz (higher bandwidth) to get the device to detect the coil check chip pdf information for bandwidth to understand.

[basellafe]

thanks freso for advice there is another point iwant to acces wich one of this have 20 mh and work perfectly with felezjoo http://www.ebay.fr/sch/i.html?_from=...f357N&_sacat=0

[freso]

Mybe other mumbers can show us wich one have the 20 mh i hope they make a list of all the chips that work with a url so others can try 2..... And i saw mybe jladre or another mumber said he salvage original LF357 from an old vacuum from the 80's as i remember mybe he can give the company name and pictures or the machines where we can salvage original LF357... That will be a good help

[basellafe]

[basellafe]

did some one face this problem ihave programmed atmega with arduino r3 buad rate 19200

[samii]

Hello basellafe
maybe your 2.2 mf capacitor need reversed near 357. Negatif side needs connect to 357. positive side to 100r is correct.Connection in your picture is like wrong.

[basellafe]

U r right samii but that was in ivica board and irebiuld it in iranian baord the lcd in the first work perfectly but now ldont know what ido wrong i played with some resister and reprogrammed and thats it the coil woudnt work but early it work i resold some capaceters

[basellafe]

abaut pin number 23 with coil how much voltage it should be for aperfect signal

[heyran]

felezjoo isn't good as it sound ... only a simple pi md with poor stability in real soil...