|
The LRL Antenna
Quote:
Very well,you can develop better antenna for this LRL,but also need something very ligth,satelite dish ok but one of the smaller. As i told,this is one LRL experimental and open to many modifications and improvments for better performance. Regards |
2 Attachment(s)
Attachment 12190
Attachment 12191 Quote:
|
1 Attachment(s)
Morgan you're right with the antenna, 'cause the pistol-MD shouldn't be too heavy.
Accupack, Case, electronic, Antenna - maybe all together 1-2kg max. I've been lucky with my FET find 'cause I found this info: "2N5485 is a viable alternative to the seeminly weak MPF 102" And I've constructed already circuit01 - see below. :D It is very simple and uses two NF "low gain" transistors (the most common ever) but it has already noise output via speaker, even without any antenna! The principle is an AM diode receiver with audio amp but without any tuning capacitor or ferrite-transformer-coils and you can built it at 1x1cm size even without pcb. Very sensitive already because it justs needs a 470k resistor as "electron-feed". No sparks audible so far. Perhaps this will be later just the audio-stage. For amplifying such week electrostatic signals i have to check what noise level all those parts have and maybe an op-amp LM358 or LM324 makes a better job. And I'm already curious how good the field effect transistor will receives "whatever".. Anyway - my first receiver circuit after a very long time and this is just the beginning! :) |
It works!
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! :lol: :cool: 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. :) |
LRL modifications
Quote:
Well,it seem we are alone in this project but i like to hear you have good results with the first PCB. Anyway what kind of antena or coil you make to detect the silver ring ? Regards |
LRL
Quote:
I´m curious becouse the original static receiver cant detect fresh metal,yes if we connect the BFO ...Are you sure about this results ? |
may be not detect the metal, but static hand, can you put the ring on an cotton wire how fishing?
|
1 Attachment(s)
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! :D 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! :) |
1 Attachment(s)
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. |
dear funfinder; very interest you experiment, i too work in these statics field
i send you me embrace, thanks for you exposition |
LRL improvments
Quote:
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 |
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! |
may be we need other input jfet tipe for major noble metal detection, exist many!
|
LRL project
Quote:
Let´s put this your improvments in the thread ELECTROMAGNETIC FIELD DETECTOR,and also other people can come with more ideas. |
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 |
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 |
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 |
Saxon
Quote:
No need this 325 turns,i build my saxon BFO and use variable capacitor from old pocket radio,and it works fine. |
???????????????? 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 |
BFO
Quote:
In stead of the reference coil with 325 turns,you can use 1 mH chok variable from an old radio. |
bfo for most range, i prefer coil big large 8 cm 1 cm diameter center adj of brass whit nucle or iron spring ( anten ) 325 turns more less
saxon for president |
PD
Quote:
|
PD
1 Attachment(s)
Quote:
This PD in the photo (with silver coins) is the clone,it works very good. But the original works better. Attachment 13781 |
Quote:
Except if targets are buried by yourself - than you detect not by PD, but by SD (Self Deception). |
Quote:
|
| All times are GMT. The time now is 05:03 PM. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.