Very low frequency circuit very good

[shahrayar]

Very low frequency circuit very good
Very sensitive to static electricity and electromagnetic fields
Lightning strikes may harm him
It has an insulation feature, but I don't know how
Possible help from engineers, such as developing the antenna

[shahrayar]

The device is completely stable
The TV senses from 1/2 meter


[IMG][/IMG]

[shahrayar]

very sensitive
I recommend making them, as the hand senses over 20 cm, the computer senses over 5 meters and many advantages

[shahrayar]

I shrunk the antenna so that the amplifier will not malfunction
By extending the antenna, it picks up the TV signal from 3 m

https://www.youtube.com/watch?v=kiaZ9xE0KEU

[humhum]

This circuit is very high impedance Preamp, this schema sharing one Friend from this forum.

[FrancoItaly]

Originally Posted by humhum

This circuit is very high impedance Preamp, this schema sharing one Friend from this forum.

You must use CA3130 (very high impedance), 741 operational has a very low input impedance.

[abdou2014]

ZAHORI WORK FINE WITH CA3130

[abdou2014]

I added a 50hz notch filter

[abdou2014]

Originally Posted by shahrayar

Very low frequency circuit very good
Very sensitive to static electricity and electromagnetic fields
Lightning strikes may harm him
It has an insulation feature, but I don't know how
Possible help from engineers, such as developing the antenna

it's active antenna for sound card VLF reception , it's not an LRL

https://www.qsl.net/dl4yhf/speclab/vlf_rcvr.htm

[shahrayar]

Originally Posted by abdou2014

it's active antenna for sound card VLF reception , it's not an LRL

https://www.qsl.net/dl4yhf/speclab/vlf_rcvr.htm

Is it not suitable for detecting electromagnetic fields of metals?

[abdou2014]

Maybe with some modification, it will be able to detect a big treasure at some meters

[reza vir]

Originally Posted by shahrayar

Is it not suitable for detecting electromagnetic fields of metals?

No this is vlf filter
It can be used at the inputs of some other circuits

[humhum]

Can be so like .....
This is part from all system .

[WM6]

Even better:

[abdou2014]

Originally Posted by humhum

Can be so like .....
This is part from all system .

GOOD CIRCUIT WHAT'S VLF RECEIVER , CAN YOU SHARE THE VALUES ?

[humhum]

Originally Posted by WM6

Even better:

But here Laser wave is in wrong um (micrometer) .

[WM6]

Originally Posted by humhum

But here Laser wave is in wrong um (micrometer) .

It is about thermal IR (long wave infrared) laser, in this application ranging

from 6μm to 14 μm wavelength. This region is molecular vibration wavelength.

[humhum]

Originally Posted by WM6

It is about thermal IR (long wave infrared) laser, in this application ranging

from 6μm to 14 μm wavelength. This region is molecular vibration wavelength.

Now is Okay ,Dear WM6

[Mojtabab88gh]

Hi friend's
I see a long range detector , use fm radio wave for detecting metal in depth , and builder saying can detect only old objects in depth .
Transmission using fm radio section , and receiver detecting maybe reflection or phase different and alarmed .
Is that possible ?
Any body have idea?

[IranGanj]

you mean some thing like Raven from treasureNow?

https://www.geotech1.com/cgi-bin/pag...aven/index.dat