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]

preamp high impedance

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

[FrancoItaly]

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]

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]

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]

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]

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

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