IDX-PRO+VDI

[Koala]

Well done Barry

Hopefully you will inspire other to stick with this project

Best of all this detector holds it's own against much more expensive machines.

I use a 8" CC a lot and detects really small items well. Last time out I found I very small cartridge case 6mm dia and 10mm long wafer thin probably a reduced charge from a Victorian shoot the duck at the fair type game. Also a very thin slice of coin only 6mm and also wafer thin. Just need to find that diamond stud earring

Take a bit of getting use to learn the different tones and volumes. I found slowing my swing right down on difficult ground really improves it's performance

Good luck with your next build and you have many good finds

[jeohunter]

hello friends, i know that exist the last 20 units idx pro at whites,
ready with the new modifications that increase perforomance,
and tested and warranty directly from white,
stefano

[hoadlies]

STEVE ''THE-WIZARD''

Hi Barry, your right the tone is product of C and R so its easier to tweak a pot than swap out caps. I did this on mine last summer and ran it with the case open - So I could settle on a tone which I felt gave my ear the best note for detect. When doing this live over buried targets it seems to get "that note" for you. All detectors should have adjustable tone.
S

WELL ,,,STEVE ,Thats a great mod & it worked perfectly ,I fitted a 100k trimmer & found a sweet-spot & removed trimmer & placed a fixed resistor [1/8th-watt] x in my case 85-100k ,But you are correct a tone control would be nice for field test & ones ears [''My EARS -are 74 Years-OLD ,HA.HAAAR]..I guess we could use a multi-core audio light cable & fit a pot ??? but another control would get the panel too busy ???..

WELL I closed up my Coplanner-coil [Thanks DON],,,after some more tweaking of null & RX cap ,I finally found that I was trying to keep too close to .033!!!,, I was convinced that it needed to be under .033 ''WRONG'' After setting the RX at 6,60kh ,,That I needed to increase the RX cap for very good GEB -reject ferrite & get disc working A-OK I ended up with .047 !!!!! .I feel that wire guage etc must play a part in all of this & being able to get the mh readings acurate ,I think I need to invest in one of those LCD JOBS as I have 2x multimeters with inductance & both read differently ????..

THIS seemed to also increase my ''Air-Gold-ring test'' by several CM over my earlier DD coil air tests !!,rejects small steel well ,..pliers etc etc..

Steve I adapted your 12v switched mod & found it gives a stronger signal [''HIT''] , it will be interesting to try if it hears better on a buried target

CANT wait to try-out tomorrow in daylight ..on some buried targets ..

FOUND a better Pole [wand] A adjustable car washing brush ,will buy one soon as its retractable for travelling ..

I would highly recommend STEVES tone mod & also the VOL-Control posted earlia in this thread..[both easy mods]

ALSO as I am a'' First M/D DIY builder''!,,, I strongly advise any one building this great IDX to ''READ'' this thread several times because most answers are in here ,though the help of the more learned members likes of GOLF-NUT ,KOALA,S/Dollar DON, & many others who give great Advice ,I say Thankyou to ALL ,,,,,,,,,,,BARRY

[golfnut]

Hi Lax, you Disc Gate wrt Tx should be more like this.. S

[golfnut]

Hi Barry, your right the tone is product of C and R so its easier to tweak a pot than swap out caps. I did this on mine last summer and ran it with the case open - So I could settle on a tone which I felt gave my ear the best note for detect. When doing this live over buried targets it seems to get "that note" for you. All detectors should have adjustable tone.
S

[LAX]

Thanks Koala,
I'm newbie in MD as you see.

Laxi

[hoadlies]

Hi Glad its coming together for you...

To raise the tone tack a 100k miniature open trimmer across R53

HI STEVE & ALL ,Thanks for that tip mate,,,I was looking at the feedback cap c19 on U6 wondering to reduce that
would raise tone frequency similar to an audio type circuit ????, but i will try your trimmer ..

I will be building a second IDX for my son as soon as we get kit & or boards from S/DOG ..

THEN I want to build a second one for myself with a view to detect Gold [ie] smaller targets !!!, will look to raise frequency & a new coil to suit ..This will be an experimental project so as to leave my already built one as is for coins etc..

I see later detectors used for gold are into the very high frequency range [Unafordable to me] Whites make a couple a TDI & a GMT ..these are listed as ''OZ-SERIES-UNITS'' GARRETT make the ''INFINITY'' which seens another good machine but again expensive ..

OF course the modern machines are going with fancy readouts [LCD screens etc] but for practical use I feel that all unesasary,, ''EARS only should suffice in my book..

Would be nice to be able to build a similar DIY unit ??????BUT Would need boards as I cannot buils self made PC-Boards myself!!..

I feel for Coins this IDX is a great machine rivalling many more expensive Trasure type units ..

BEEN away for the weekend [non-hobby-BUGGA] but back to my IDX project ,,COOLER weather now here.. CHEERS to ALL DIYERS & ALL ,,,,,,,,BARRY..

[Koala]

Hi,

I measured a very interesting thing when I used 1uF cap in TX coil the RX has totally same frequency about 6.5 kHz
and then when I used 2uF for TX then the frequency of TX and RX = 4.6 kHz.
I don't understand it...
Thanks
Laxi

The RX and TX should have the same the same frequency it's the phase that changes with a change with a change in RX caps
by tweaking the RX caps trail and error you should be able to increase the detection distance but don't go too far that ground balance or disc fails. Also if tuned for max depth in air test the coil can become unstable over real ground.

[LAX]

Hi,
I've build my own IDX from Silverdog and also build a searching coil.
TX dia 23 cm (9 inch), wire 0.7mm (21G), 0.587 mH and 1μF cap
RX dia 10 cm (4inch) , wire 0.18mm (33G), 35.6 mH and 58nF cap
When I try to set up it then the sensitivity is very poor.
I checked the winding directions it's OK,
I measured a very interesting thing when I used 1uF cap in TX coil the RX has totally same frequency about 6.5 kHz
and then when I used 2uF for TX then the frequency of TX and RX = 4.6 kHz.
I don't understand it...

My DISC gate signal shape is similar than golfnut's (thanks a lot for it )...


What did I do wrong? Where I have to start the investigation? Any idea?

Thanks
Laxi

[Waikiki_Sweep]

Oh yes. Now I get it. That code was a content of PNG image file "PNG IHDR(-SsBIT" with address: http://mystatus.skype.com/smallicon/sead.pajazetovic3
Once code was mentioned in the post it was copied into all keyword tags by vBulletin automatically so I saw it everywhere.

Also everything looks legit. Anyone who add a skype address into profile will have a small "X" image near his name with address mystatus.skype.com/smallicon/BLABLABLA.
So if you click on it you can call his Skype. It is vBulletin feature. Looks like nothing to worry about.

seadoggy

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[multieagle]

Is this it: <div class="imlinks">
<a href="javascript://" onclick="imwindow('skype', '11264', 500, 340); return false;"><img src="http://mystatus.skype.com/smallicon/sead.pajazetovic3" alt="Send a message via Skype&trade; to seadoggy" /></a>
</div>

[golfnut]

Hi Glad its coming together for you...

To raise the tone tack a 100k miniature open trimmer across R53

[sinclairuser]

if anyone here can unravel it its you waikiki, it just seemed strange as i have never seen trackers on geotech.
i'm i right i thinking if this was a google tracker, the threads here would show in google searches, not sure how they work just get ghostery to block them all.

[Waikiki_Sweep]

Thank you. Now I see. That strange code has been inserted into "META keywords" section on every page in this IDX-PRO+VDI thread. No codes are allowed in "keywords" tag by the book.
Sure it is mistake but may be it is malicious attempt too.
As I can see vBulletin generating set of keywords automatically for every page and for this thread it has inserted that code for no reason.
Probably something was wrong at the moment of creation of the IDX-PRO+VDI thread or once layout of forum has been changed.
If you have old pages saved on your computer you can check
HTML source <meta name="keywords" content="???? strange code are here ?????">
I Will dig more in it when have a time.

[sinclairuser]

not on this machine waikiki, ghostery detects one tracker on this page "skype"
only other thing i can find out is its some sort of widget

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