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  #101  
Old 12-14-2012, 09:32 PM
ikumi5 ikumi5 is offline
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hello ts
antenna=? (how many turns (Approximately ))
sorry i have no L meter

thanks and regards
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  #102  
Old 01-20-2013, 08:37 PM
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Correction circuit WITH 3914
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  #103  
Old 06-26-2013, 04:04 PM
iron1944 iron1944 is offline
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WM6 great master help me?
This large square coil circuit instead of 5 khz alıcı.Ben ferrite rod diameter of 1 cm length 20 cm
use wire diameter and number of turns of the coil wound on the rod lazım.Ferrite how should it be?
Thank you.

http://k1306.hizliresim.com/1b/u/pm3y5.jpg
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  #104  
Old 06-30-2013, 12:09 AM
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WM6 great master help me?
This large square coil circuit instead of 5 khz alıcı.Ben ferrite rod diameter of 1 cm length 20 cm
use wire diameter and number of turns of the coil wound on the rod lazım.Ferrite how should it be?
Thank you.

http://k1306.hizliresim.com/1b/u/pm3y5.jpg
It depend of ferrite rod characteristics which are not known..

You can use the same wire diameter. First wind 50 testing turns on your ferrite rod and measure inductance. Out of this you can calculate total inductance bzw. number of turns.

For 5kHz preference:

your coil inductance have to be 1mH

and C1 1uF (instead of 0.02uF as on schematic).
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  #105  
Old 08-06-2013, 06:17 AM
liubing liubing is offline
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Help PI detector project, 50X50cm can detect 5m, with 1x1m coil, which help me? Discrimination is not required,
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  #106  
Old 08-06-2013, 08:00 AM
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Help PI detector project, 50X50cm can detect 5m, with 1x1m coil, which help me? Discrimination is not required,
You probably already know who would help you dig at 5m?
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  #107  
Old 08-06-2013, 08:11 AM
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I look forward to explore 5M
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  #108  
Old 08-06-2013, 09:31 AM
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I look forward to explore 5M
Good, pinpoint at 5m is +-2m. So you need to dig hole 5x4m. And not only one, there can be in hole some metallic ore only. Probably no problem for you?
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  #109  
Old 08-07-2013, 04:40 AM
liubing liubing is offline
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I am here 20X20CM reach 2.5M, then undetectable basic thing that is buried very deep, but there are countless treasures underground, so I am committed to increasing depths
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  #110  
Old 08-07-2013, 04:57 AM
liubing liubing is offline
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Who can provide the increasing depths of effective programs? Interested parties are welcome to explore a friend
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  #111  
Old 08-07-2013, 08:22 AM
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Sorry, but I will left all those countless treasure to you.

Not interested in 5m (empty) hole digging adventure.
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  #112  
Old 08-24-2013, 07:35 AM
mahditala mahditala is offline
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Friends does not work on my device
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  #113  
Old 08-24-2013, 08:42 AM
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Dear mahditala. This is a toy only, to play around, with intention to practice some basic electronic building and in hope to prevent you from buying highly overpriced crap as Mineoro, OKM etc., which does not work also.

And what is not working on your device, you got no sound out of it, or it cannot point you to golden treasure?
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  #114  
Old 11-26-2018, 09:36 AM
edward edward is offline
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Dear mahditala. This is a toy only, to play around, with intention to practice some basic electronic building and in hope to prevent you from buying highly overpriced crap as Mineoro, OKM etc., which does not work also.

And what is not working on your device, you got no sound out of it, or it cannot point you to golden treasure?
Hi wm6

I am working on this vlf receiver

I dont have ferrite rod 20 cm long in avilable

What do you reccomend me??

Can i use from shorter ferrite???
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  #115  
Old 11-26-2018, 12:09 PM
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Can i use from shorter ferrite???

You can use ferrite from an old transistor MW radio.


As long you maintain ferrite antenna at 57mH, by proper number of turns,
band limits with proposed C values will be OK.


Answer on how to establish proper number of turns, you can find here.


http://www.longrangelocators.com/for...5&postcount=30
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  #116  
Old 11-26-2018, 02:12 PM
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Originally Posted by WM6 View Post
You can use ferrite from an old transistor MW radio.


As long you maintain ferrite antenna at 57mH, by proper number of turns,
band limits with proposed C values will be OK.

Answer on how to establish proper number of turns, you can find here.


http://www.longrangelocators.com/for...5&postcount=30
You mean if i changed the length of the ferrite i need to set the inductance to 57 mH by changing number of turns
Ok
About vu meter: 1 mili amper full scale does not exist how can i measure the signal strength?? (Except using leds)
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  #117  
Old 11-26-2018, 04:04 PM
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You mean if i changed the length of the ferrite i need to set the inductance to 57 mH by changing number of turns
Ok

By various length or diameter or Ferrite brands (composition) you need

to set inductance to 57mH by proper number of turns.
Otherwise you need to recalculate all bad capacitors.





Quote:
Originally Posted by edward View Post
About vu meter: 1 mili amper full scale does not exist how can i measure the signal strength?? (Except using leds)

Stay with in schematic proposed LED indicator.
You do not need 1mA VU meter.
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  #118  
Old 11-26-2018, 04:41 PM
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Quote:
Originally Posted by WM6 View Post
By various length or diameter or Ferrite brands (composition) you need

to set inductance to 57mH by proper number of turns.
Otherwise you need to recalculate all bad capacitors.







Stay with in schematic proposed LED indicator.
You do not need 1mA VU meter.

How can i recalculate the capacitors?
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  #119  
Old 11-26-2018, 04:47 PM
abdou2014 abdou2014 is offline
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the antenna of my gold gun is 59mH

https://ibb.co/mMNpy0

what can I have with this schematic ???
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  #120  
Old 11-26-2018, 04:52 PM
edward edward is offline
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Quote:
Originally Posted by abdou2014 View Post
the antenna of my gold gun is 59mH

https://ibb.co/mMNpy0

what can I have with this schematic ???
This is gold gun???

The gold gun includes tow 3.5 cm ferrite rods with 337 turns wire 0.2 mm from center of each rod
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  #121  
Old 11-26-2018, 05:37 PM
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Mr WM6 Is the transmitter essential ?
where should the transmitter be fixed ?
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  #122  
Old 11-26-2018, 06:35 PM
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How can i recalculate the capacitors?

Corrections my typo in previous post: Not " all bad capacitors." but "all band capacitors".



You can use one of online LC tank calculators with known variables L and frequency band.

I suggest you not to change C value, but to establish L of ferrite antenna at 57mH by proper numbers of turns.
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  #123  
Old 11-26-2018, 06:42 PM
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Mr WM6 Is the transmitter essential ?
where should the transmitter be fixed ?

Of course it is essential.


TX is your separate multi frequency device or existing (military) sender working at about 30kHz.

RX to TX should be oriented like this example with Gold Gun:

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  #124  
Old 11-26-2018, 07:30 PM
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is this receiver capable of detecting the earth's magnetic field ?
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  #125  
Old 11-26-2018, 08:22 PM
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On lower band, if you move sensor to fast.
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