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  #1  
Old 12-09-2019, 11:32 AM
shahrayar shahrayar is offline
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Default Very low frequency circuit very good

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
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Old 12-10-2019, 06:07 PM
shahrayar shahrayar is offline
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The device is completely stable
The TV senses from 1/2 meter


[IMG][/IMG]
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Old 12-11-2019, 12:39 PM
shahrayar shahrayar is offline
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very sensitive
I recommend making them, as the hand senses over 20 cm, the computer senses over 5 meters and many advantages
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Old 12-12-2019, 07:59 AM
shahrayar shahrayar is offline
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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
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  #5  
Old 12-14-2019, 08:18 PM
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Default preamp high impedance
This circuit is very high impedance Preamp, this schema sharing one Friend from this forum.
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  #6  
Old 12-15-2019, 02:33 PM
FrancoItaly FrancoItaly is offline
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Quote:
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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.
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Old 12-15-2019, 06:32 PM
abdou2014 abdou2014 is offline
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ZAHORI WORK FINE WITH CA3130
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Old 12-15-2019, 09:15 PM
abdou2014 abdou2014 is offline
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Quote:
Originally Posted by shahrayar View Post

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
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Old 12-16-2019, 02:46 PM
shahrayar shahrayar is offline
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Originally Posted by abdou2014 View Post
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?
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  #10  
Old 12-16-2019, 04:18 PM
abdou2014 abdou2014 is offline
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Thumbs up
Maybe with some modification, it will be able to detect a big treasure at some meters
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Old 12-25-2019, 12:31 PM
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Originally Posted by shahrayar View Post
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
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Old 02-10-2020, 05:33 PM
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Can be so like .....
This is part from all system .
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Old 02-11-2020, 12:24 AM
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Even better:




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  #14  
Old 02-11-2020, 02:55 PM
abdou2014 abdou2014 is offline
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Can be so like .....
This is part from all system .
GOOD CIRCUIT WHAT'S VLF RECEIVER , CAN YOU SHARE THE VALUES ?
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