ICONOS MD 807

[Morgan]

LRL

Silver Ring lying on cartboard detected from 15-20cm! over some sort of transformercoil I attached to the gate. Hum vanishes if ring is near.

So far no shielding and built on a plastic surface - no problem!

FET 2N5485 drain to antenna in (see schematic) and source to +9V via 150 Ohm resistor. Everything else like before.

Antenna- and fine-tuning-experiments will follow soon.

Thx for ya help Morgan and as you see already it also won't take very long to perfectionate the whole thing.

I´m curious becouse the original static receiver cant detect fresh metal,yes if we connect the BFO ...Are you sure about this results ?

[detectoman]

may be not detect the metal, but static hand, can you put the ring on an cotton wire how fishing?

[Funfinder]

http://www.multiupload.com/SHCZFGJA5H

In the test from yesterday I layed the ring on the other side of a Din A5 cartboard and neared it to the coil, so I definitivly can tell you that it was not the hand, because of the vanishing expotential amplitude of the signal the very closer the ring came.
In the video it's more the hand but it also works with rings only or iron, as example tin-cans (from a half meter so far).

This experimental circuit isn't adjusted to any frequency at all - perhaps this is much better - and it HAS to detect metal at this level if it should find it out in the wild!

I just have some problems to keep the "hum" alive.
If the circuit stands at a very good calibrated position (sometimes mm-work) the static remains and the speaker outputs it all the time, but sometimes I have to touch the FETs gate with my finger until the "field" is up again.

Anyway its possible to get this good audible signal all the time.

Also recognised there is some "phase-shift" involved, sometimes noise raises, sometimes vanishes if metal comes near to coil or even to FET wires. But don't focus too much on this few trafo-windings - they mean nothing. Those thing was just near my hand so I attached it.


Next I have to find out how to calibrate the peak-gain by tunable condenser or variable resistor and how to make it stable and sensitive. If you have some FET left you can built this circuit in 15min. and make your own experiences, verify my discoveries and support the task!

[Funfinder]

http://www.multiupload.com/FJ82JS1ID5

With the new added resistor (red dots only connected) you can see in the video loud and clearly how the ring gets detected which swings from a thread til 10cm with this improvised coil - with both cables at the FETs gate. The circuit now is much more sensitive and louder. Perhaps the basis of T2 needed some additional current, but I don't know why this has to be te one from the speaker.

Directional works only with grounded reflector. I made some fancy tests with my mini-tesla-coil plasma ball which got detected from 1m.

And I tested an op-amp LM358 connected at the output of the FET - louder but important analog signals were missing so I still use the transistors.

Perhaps antenna- and out in the wild-tests tomorrow or in the next few days.

[detectoman]

dear funfinder; very interest you experiment, i too work in these statics field
i send you me embrace, thanks for you exposition

[Morgan]

LRL improvments

http://www.multiupload.com/FJ82JS1ID5

With the new added resistor (red dots only connected) you can see in the video loud and clearly how the ring gets detected which swings from a thread til 10cm with this improvised coil - with both cables at the FETs gate. The circuit now is much more sensitive and louder. Perhaps the basis of T2 needed some additional current, but I don't know why this has to be te one from the speaker.

Directional works only with grounded reflector. I made some fancy tests with my mini-tesla-coil plasma ball which got detected from 1m.

And I tested an op-amp LM358 connected at the output of the FET - louder but important analog signals were missing so I still use the transistors.

Perhaps antenna- and out in the wild-tests tomorrow or in the next few days.

Hello Funfinder

In this last video i´m convinced your LRL is detecting the ring.
This is one way to simplificate the project,and probaly we dont need to use the BFO circuit. Thanks for this improvments.
Can you tell what kind of diode you have in your device ?

Thanks

[detectoman]

mm may be this is only the begin of an intersting lrl, i think morgan can voila how rocket to moon, to this little project
whit other transistor input and preamplifer, e.g 3904 may be can detect in metales, radio reception so far
too whit other transistor dupla complementaries: bc547+ A1273Y you can put very hig and stronger sound what need block further whit your hands, your ears
i whis good future for this wird project
i like to parabolic grounded be incluide for directional, may be an big lamp handed light deflector
ohhhhhh mam! what bad is my english!

[detectoman]

may be we need other input jfet tipe for major noble metal detection, exist many!

[Morgan]

LRL project

http://www.multiupload.com/FJ82JS1ID5

With the new added resistor (red dots only connected) you can see in the video loud and clearly how the ring gets detected which swings from a thread til 10cm with this improvised coil - with both cables at the FETs gate. The circuit now is much more sensitive and louder. Perhaps the basis of T2 needed some additional current, but I don't know why this has to be te one from the speaker.

Directional works only with grounded reflector. I made some fancy tests with my mini-tesla-coil plasma ball which got detected from 1m.

And I tested an op-amp LM358 connected at the output of the FET - louder but important analog signals were missing so I still use the transistors.

Perhaps antenna- and out in the wild-tests tomorrow or in the next few days.

Let´s put this your improvments in the thread ELECTROMAGNETIC FIELD DETECTOR,and also other people can come with more ideas.

[Funfinder]

Good idea, Morgan so this topic remains to the Iconos MD 807.
Here's the thread:

Simple but brilliant LRL

http://www.geotech1.com/forums/showthread.php?p=112103

[detectoman]

hello morgan and guys, the bfo sta clara ( saxon ) is the best for be stable, only put the first oscilador transistor reversed, bc548, whit these these bfo came stable, these bfo acept evervary transistor in the other steps for operation, if you put to final stage an mps, a12 have amount of sound, but whit other resistence
you should put near of 325 turns of wire in reference coil may be .20 wounded in pipe of plasti of 1 cm, and extended these turns aprox, 8 cms, then put inside an ferrite nucle for adjustable
the best configuration of turn, is where the speaker sound how tac tac
in coil of down plate, near of 3 ohms of wire
but for projet lrl, and ciruit static jfet, you should aproximate the wire same of all's coil, for an armony, equal thickness e.g
so if wire of plate bfo detection is .20, i think you should put in all, too .20, and anten static too .20
should acomplish in lrl bfo-static, and wave resonance in all coils, may be the coil detection ( not reference )
so, if static reception is out of resonance whit coils bfo, or in other dimension, the bfo not detect far, too very important is the tipe of transistor
a13 last step, is good but very hig consume energy, so bc 548 is adecuate
inn saxon, you can play whit variety of transistor, any detect rf major
i build an bfo saxon very stabile, put first osc, reversed transistor 548, any 2 little cap cross in determined part, i have the schematic in any notebook need find, but saxon is very noble bfo, i sure no need reversed transistor of stabilizations, if coils wire gauge of bfo, is in equalibration, no need to all,
the bfo saxon is the most apropiate for soil mineral exclusion, but not discriminate
if you go use bfo, i can give opinions at everyvary
bfo saxon project, isnt deeper but not detect little trash, is fine
for me the make these old project and modify, is my beauty hobby
bfo is the champion

[detectoman]

apologies, no! wire of coil of plate in bfo saxon, should be no thin, for normal md
but first make the reference coil whit 325 turns, wire most thin, plastic 1 cm- 8 extended, adj nucle, how in anterior mesage, after calculate winding the rastre coil @ obtain right silence in speaker and stable
but for conjunction how lrl, & added circuit, rf or static, need other configuration in other armonics, to silence, or, hum", this no easy
the difficultous all,'s lrl is the put to point final adjust calibration, this is always narrow

[Morgan]

Saxon

apologies, no! wire of coil of plate in bfo saxon, should be no thin, for normal md
but first make the reference coil whit 325 turns, wire most thin, plastic 1 cm- 8 extended, adj nucle, how in anterior mesage, after calculate winding the rastre coil @ obtain right silence in speaker and stable
but for conjunction how lrl, & added circuit, rf or static, need other configuration in other armonics, to silence, or, hum", this no easy
the difficultous all,'s lrl is the put to point final adjust calibration, this is always narrow

No need this 325 turns,i build my saxon BFO and use variable capacitor from old pocket radio,and it works fine.

[detectoman]

???????????????? howwwwwwwwwwww? then var cap make the time's coil oscilator? may be may be, I am disapointed, due condenser is an aluminum coil
wow morgan you is an genius of electronic, i go implement these crazy idea
i go need an big seleector for caps

[Morgan]

BFO

???????????????? howwwwwwwwwwww? then var cap make the time's coil oscilator? may be may be, I am disapointed, due condenser is an aluminum coil
wow morgan you is an genius of electronic, i go implement these crazy idea
i go need an big seleector for caps

In stead of the reference coil with 325 turns,you can use 1 mH chok variable from an old radio.