Andy Flind MFD. - Page 6

abdou2014 · #**126** 02-21-2018, 07:08 PM

I succeed, a flash every one second, thank you Geo !

abdou2014 · #**127** 02-23-2018, 08:09 AM

Hi all, I'm going to do another experiment, and tried to work in FM mode, I want to have the opinion of Geo?

abdou2014 · #**128** 02-26-2018, 11:58 AM

Hi, what is the minimum and maximum temperature favorable for working with an LRL?

sinclairuser · #**129** 03-13-2018, 04:21 AM

Quote:

Originally Posted by abdou2014

ANDY WITH DIGITAL DISPLAY

hi abdou, why did you cover the picture?.

Guard · #**130** 03-18-2018, 12:23 PM

Quote:

Originally Posted by Geo

Hi.
All these years i received so many mails to post the schematic of Andy Flind.
Today i decided to post it here.
Article is in PDF format and it is from EPE magazine.
I would like Admin to tell me if i can do it or No. Article is from year 1995.

Regards

Thanks Geo

I somehow finish the MFD.
Ferrite 6khz, 1nf, no preamp, more gain to ic1b, a 1$ chinese clock from +10cm and from sides from 25cm.
Nice mfd, need mods

Inside lab, it beeps in any spark, and from 7m. to the Northest walls (metal bars).
Away from 50Hz to mountains, has no compass "thinks" and no bips !
I like the gold-bell-sound

Regards
George

Dubulumach · #**131** 04-01-2018, 04:54 PM

1st mod of MFD

Ive forgot to put 470pF in negative feedback in parallel with 1Meg biasing resistor.

Best Regards
Dubulumach

Dubulumach · #**132** 04-02-2018, 05:39 PM

2nd mod.

Nicolas · #**133** 04-06-2018, 10:27 PM

Quote:

Originally Posted by Geo

Haha... now you have a Cryfton OBMD-I.
From what i remember you are not very good.
My device was detecting my watches (a Tissot and a Longines) near to coil.
Also was detecting a China watch from 5..6 cm. I saw a video from a member where his lrl was detecting the watch from 9..10 cm far.

Hello Geo you have right

Geo · #**134** 05-02-2018, 06:59 PM

Hi.
I found this video at Utube.
MFD detects a watch from 20cm.
Also a very good construction.
Congratulation!!!

https://www.youtube.com/watch?v=t8QY...le&gl=GR&hl=el

rxlock2 · #**135** 05-31-2018, 11:52 AM

https://www.youtube.com/watch?v=NiGuoENQNVg&app=desktop

TV detection over 10 meters

Guard · #**136** 05-31-2018, 09:41 PM

Quote:

Originally Posted by rxlock2

https://www.youtube.com/watch?v=NiGuoENQNVg&app=desktop

TV detection over 10 meters

Also you say.
"10-meter television detection without exhausting the MFD due to the H / M noise of other home appliances".

First ... nice job !

Second, I think that "10-meter television detection" doesn't mean anything.

You tell us that the coil is resonate , with high "Q", at that specific TV frequency (-+55Khz, or whatever), so at 3,5,100, 1000Khz doesn't receive the fluorescent lamps, or what ever else ... ?
I think that every receiver-mfd act like this, when is resonate to a transmitter.

-------

This video i upload it today, is from my first (1st MFD) outside test (+60cm and is very close to metals) !
The sound is low, sorry (beeper inside, no hole, glued oposite to the coil)
Battery test outside from ++10m.

https://www.youtube.com/watch?v=CjQvV9nhDKU

To the end, the false beeps is the North, i turn it to see (i send it to a friend) the green led.
-------

These days my 6th MFD detects the watch easily from +1 meter and after many tests in 7th MFD ..........

The bigger joke is the distance of detection, for a ... "battery charged" - "working" - under ground - huge ... "clock"

.

rxlock2 · #**137** 06-01-2018, 08:16 AM

It is very interesting. The coil used can be seen around the machine. What frequency does your own work?

abdou2014 · #**138** 10-07-2019, 06:08 PM

abdou2014 · #**139** 10-07-2019, 08:52 PM

I'll add an auther detector with andy circuit for more distance

abdou2014 · #**140** 12-18-2019, 10:16 AM

Hi everyone, I had new results after some modification, I think my Andy flind works as a magnetometer, it detects a neodymium magnet at 4 meters, it detects any ferrous object at 1.5 meters, I want have a display circuit that distinguishes between iron and cavity ?
Thank you !

abdou2014 · #**141** 12-18-2019, 02:36 PM

I think our friend G?o has an idea on the subject ???

reza vir · #**142** 12-25-2019, 11:31 AM

Quote:

Originally Posted by abdou2014

Hi everyone, I had new results after some modification, I think my Andy flind works as a magnetometer, it detects a neodymium magnet at 4 meters, it detects any ferrous object at 1.5 meters, I want have a display circuit that distinguishes between iron and cavity ?
Thank you !

hi Congratulation
do you test real burid metal?

abdou2014 · #**143** 12-27-2019, 04:20 PM

I do not intend to use it for the detection of buried metals, I have two LRLs which works very well, it is for detect cavities , it's magnetometer .

shahrayar · #**144** 01-02-2020, 05:45 PM

Quote:

Originally Posted by abdou2014

Hi everyone, I had new results after some modification, I think my Andy flind works as a magnetometer, it detects a neodymium magnet at 4 meters, it detects any ferrous object at 1.5 meters, I want have a display circuit that distinguishes between iron and cavity ?
Thank you !

Can you send me the diagram I want to make this device
Is there a topic for this device in the forum?

abdou2014 · #**145** 01-03-2020, 05:13 AM

The diagram is in the tread ( andy flind mfd ) I just added a ULF preamp with special 10H coil that I designed

shahrayar · #**146** 01-03-2020, 08:11 AM

I found the topic, you only help in unnecessary and useless conversation

Geo · #**147** 01-10-2020, 07:02 AM

Few days ago a friend sent me a new "release" of Andy's MFD. I tested it and it is more more sensitive than mine MFD. A very good implementation from a non enginear guy!!!

Pahom · #**148** 01-10-2020, 06:55 PM

Quote:

Originally Posted by Geo

Few days ago a friend sent me a new "release" of Andy's MFD. I tested it and it is more more sensitive than mine MFD. A very good implementation from a non enginear guy!!!

Good night Geo! If it does not bother you, tell a little about the controls of the device. Which is responsible for what. Your friend refused indication on lm 3915 what do you think with what it is connected ?.

Geo · #**149** 01-11-2020, 06:50 AM

It is something difference. My friend disconnected the Andy Flind's pcb and connected a pcb from data comunication with high gain.
See the new photo with text at every control.

Pahom · #**150** 01-11-2020, 07:36 AM

Quote:

Originally Posted by Geo

It is something difference. My friend disconnected the Andy Flind's pcb and connected a pcb from data comunication with high gain.
See the new photo with text at every control.

Thanks!!! I also think to turn off the LM 3915. I noticed that with this node the response from the spark is a little late and reduces the distance by a quartz watch. Until I understand why this is happening. And at what distance does this device catch the movement of a quartz watch? So far, I have a spark from 1.5 volts to 2 meters and a 7cm clock with confidence.