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

[jladre]

Can you give details on your coil, size, number of turns. Did you use LF357 or a substitute? Anyways congrats on your success it seems to be working very nice.

Hi eclipse. That is a 56cm coil with 400uH inductance made of 2 turns of 26awg CAT cable.. Im planing to make 68cm coil i have a 1mm copper wire her..i hope this would be better. Im using lf356 but im trying to get lf357 problem is only ebay is the option.

[jladre]

Nice result, Josue. Is that your 400µH, 56cm coil ?

Yes it is.. But that deep detection is only in the table.

[eclipse]

Can you give details on your coil, size, number of turns. Did you use LF357 or a substitute? Anyways congrats on your success it seems to be working very nice.

[greylourie]

Nice result, Josue. Is that your 400µH, 56cm coil ?

[jladre]

http://m.youtube.com/watch?v=2mQVF7v1quw

[jladre]

I spend too much time for that trash code trying to check why problem exist.. But i was just been a victim of that bad joke!!

[ivconic]

Yes i uploaded bad hex intentionally, sorry it was really bad joke.
Like i said; i don't have moral and ethical right to spread around cracked hex.
It would not be a fair towards it's author.
Yesterday was Friday 13th... really bad day for my nerves.
Also; due recent horrific occurrences in France; i will avoid any kind of debate here, no matter the subject.

[Qiaozhi]

I got problem with this no_counter hex. I cannot load the file. Extreme burner says it is corrupt file(invalid hwx line. In func AVRProgFrm::LoadHexFile)

me too

Ignore that file. He's just being irritating because he finds it difficult to follow the rules of the forum.

Open the file in a hex editor and look at the ASCII code, and you'll see why it doesn't work!
I've removed the attachment to save anyone else wasting their time.

[md4my]

I got problem with this no_counter hex. I cannot load the file. Extreme burner says it is corrupt file(invalid hwx line. In func AVRProgFrm::LoadHexFile)

me too

[6666]

The preamp (U2) is used in an inverting configuration with a single-ended supply, and therefore the non-inverting input needs to be biased above 0V.
R13 and R14 form a potential divider to create a virtual ground (or phantom ground) at 8.2V. Hence, the preamp output will also swing around that point (typically +10.2V to -1.8V).

THANK YOU, very usefull much appreciated.

[Qiaozhi]

Hi Qiaozhi
In post #9 from your description of how the circuit works ,is the virtual ground for the opamp created by R13/14 and referenced to pin 3 ?

The preamp (U2) is used in an inverting configuration with a single-ended supply, and therefore the non-inverting input needs to be biased above 0V.
R13 and R14 form a potential divider to create a virtual ground (or phantom ground) at 8.2V. Hence, the preamp output will also swing around that point (typically +10.2V to -1.8V).

[jladre]

I got problem with this no_counter hex. I cannot load the file. Extreme burner says it is corrupt file(invalid hwx line. In func AVRProgFrm::LoadHexFile)

[6666]

Hi Qiaozhi
In post #9 from your description of how the circuit works ,is the virtual ground for the opamp created by R13/14 and referenced to pin 3 ?

[jladre]

Happy New Year folks;

Thanks ivconic!! You are so kind!! happy new year too...

[ivconic]

Happy New Year folks;