AV multiband VLF receiver

[WM6]

Dear LRL enthusiast,

here you are an Audio-Visual Multiband VLF receiver as new toy for New Year.

You get visual signal over 4 different coloured LED's and audio signal generated by help of an melody generator circuit IC UM66 (UTC), CMOS IC’s designed for using in phone etc.

Main antenna is ferrite antenna, inductance of 57mH, but you can ad telescopic antenna too, if you wish. There are 5 frequency band, realised by switching between different capacitors, which represent different tank circuits in connection with ferrite antenna, as member Sneshko proposed:

Band Selector:
ELF (3Hz-30Hz);
SLF (30Hz-300Hz);
ULF (300Hz-3KHz);
VLF (3KHz-30KHz);
LF (30KHz-300KHz).

For C5 you can use variable capacitor out of an old radio for better frequency tuning and band covering.

[WM6]

Part list (Zehner diodes: 2x3V3, 1x4V7, 1x6V1, 1x6V ) :

[WM6]

Not on part list: 1pole 6-position rotary switch (as on pic or similar) and power ON/OFF slide or toggle switch.

[WM6]

For transistor Q1 and Q2 better use hi-gain type like BC549C instead BC549B.

UM66T melody generator:

[teknoloji]

happy years.
vooovvvv design a very fantastic idea.


Thanks
Regards

[Fred]

Amazing circuit WM6.
You should really put an attenuator somewhere...

Happy new year !

[teknoloji]

Happy new year !
now all the gold melted.

[gold24h]

this is an interesting idea,i have some questions,which capacitor is selected for elf,such as 30 hertz,also how would you use this setup,are you looking for a drop in signal or an increase in signal,also there should be a way to filter out the 50 or 60 hetz utility signal from powerlines,that would make it a perfect elf receiver,i would like to experament with this but i do not understand how to use it,does treasure increase the signal or decrease it,is magnetic direction inportant also.

[fmnotes]

Originally Posted by gold24h

this is an interesting idea,i have some questions,which capacitor is selected for elf,such as 30 hertz,also how would you use this setup,are you looking for a drop in signal or an increase in signal,also there should be a way to filter out the 50 or 60 hetz utility signal from powerlines,that would make it a perfect elf receiver,i would like to experament with this but i do not understand how to use it,does treasure increase the signal or decrease it,is magnetic direction inportant also.

HELLO.

I WANT TO MEASURE THE FREQUENCY OF RECEPTION [WITH A FREQUENSY COUNTER OR ONE PERMANENT PLACED ON THE DETECTOR PORTABLE OSCILLOGRAPH], BUT BECAUSE NO AND THE FORCE OF SIGNAL (WITH UA METER)
EXISTS SOME IDEA THAT WE CAN HIM MANUFACTURE THIS, AND IT WORKS WELL, AND REGULARLY.
I BELIEVE THAT AS LONG AS WHO NEAR YOU ARE IN THE TREASURE SO MUCH WHO POSSIBLE THEY IS THE FIELD THAT CREATES THE TREASURE.
I WAIT FOR TO SEE THOUGHTS THAT WE CAN UPGRADE HIM.

I THANK

[WM6]

Originally Posted by gold24h

,i would like to experiment with this but i do not understand how to use it

.

As already described TX RX configuration can work on 3 way:
Here presented graphically:

[fmnotes]

FROM THAT I UNDERSTAND, WHY IT DID NOT ANSWER NO ONE, DOES NOT EXIST WAY TO CONNECT METER OF FREQUENCY.
AND METER UA.

[WM6]

Originally Posted by fmnotes

FROM THAT I UNDERSTAND, WHY IT DID NOT ANSWER NO ONE, DOES NOT EXIST WAY TO CONNECT METER OF FREQUENCY.
AND METER UA.

If you are not willing to stay with cheap solution, you can ad frequency meter too. No problem.

Here LED diodes work as some sort of uA meter. But if you wish you can connect VU meter too.

[fmnotes]

Originally Posted by fmnotes

FRIEND YOU CAN SEND TO ME THE FILE FROM THE SOFTWARE THAT YOU DREW THE PCB, FOR BETTER AND WHO CLEAN PRINTING, FOR THE CREATION OF PCB.
I THANK

Originally Posted by WM6

If you are not willing to stay with cheap solution, you can ad frequency meter too. No problem.

Here LED diodes work as some sort of uA meter. But if you wish you can connect VU meter too.

I WANT WE MAKE HIM WHO MULTIFUNCTIONAL THE MANUFACTURE,
MY OBJECTIVE THEY IS NOT CHEAP, THEY IS IT BECOMES WHO EASY THE RESEARCH ALSO WITH MORE PRECISE.

THAT IS TO SAY IF IN THE PLACE THE LED I ADD A OSCILLOGRAPH, IT WILL SHOW ME THE FREQUENCY RECEPTIONS?

[J_Player]

Originally Posted by fmnotes

FROM THAT I UNDERSTAND, WHY IT DID NOT ANSWER NO ONE, DOES NOT EXIST WAY TO CONNECT METER OF FREQUENCY.
AND METER UA.

See below for a way to connect a meter to show the strength of signal.
You can change the value of R4 to make a good match for your meter to show the strength of signal.
The meter shown is 1ma, but you can use other meters with different value of R4.

Also you can connect frequency meter or oscilloscope to watch wonderful gold signals and other signals in the same place where new meter modification was placed.
You can measure oscilloscope signal from top of R4 to ground, or from base of Q2 to ground.

For me, I believe this is a good way to waste many hours watching crazy mix of signals on oscilloscope or with a spectrum analyzer.
But maybe I am wrong and you will find the elusive gold signal which no LRL experimenter has been able to describe.
Maybe you can find diamond signals too.
Who knows?

Best wishes,
J_P

[fmnotes]

Originally Posted by J_Player

See below for a way to connect a meter to show the strength of signal.
You can change the value of R4 to make a good match for your meter to show the strength of signal.
The meter shown is 1ma, but you can use other meters with different value of R4.

Also you can connect frequency meter or oscilloscope to watch wonderful gold signals and other signals in the same place where new meter modification was placed.
You can measure oscilloscope signal from top of R4 to ground, or from base of Q2 to ground.

For me, I believe this is a good way to waste many hours watching crazy mix of signals on oscilloscope or with a spectrum analyzer.
But maybe I am wrong and you will find the elusive gold signal which no LRL experimenter has been able to describe.
Maybe you can find diamond signals too.
Who knows?

Best wishes,
J_P

IN I THANK FOR YOUR ANSWER, AND FOR YOUR HELP WE UPGRADE THIS RECEPTOR.

[okantex]

Hi All ,

WM6 , I have a question for you .I have seen your drawings for tx -rx theory.

does not this vlf reciver ,receives g component of electromagnetic wave?
is not the g (magnetic wave) component of wave always in horizontal direction.
how can your ferrite see it .? since it is not vertical ( 90 degree to tx source).
is not the ferrite in null position when directed to underground target?

I do not understand as much as you , ı just try to learn, can you explain me more
thanks

btw , is any there anybody who tried this circuit?
is this circuit work in the same princible of emfad?

[okantex]

I inspected few vlf schematics of b field and E field circuits. yours is look like E field circuits.
you have low pass filter , you do not have high pass filters .does it mean if there is a working MSK ,it will effect reception below 24khz.
but since we are not looking for spherics ,or tweaks ..etc. powerfull signal is our choise.

[WM6]

Dear friend, better go back to MD. This theories will not solve your soul.