IDX-PRO+VDI

[tomec123]

I have all these building instructions, I have also read all the messages in this thread. But that wasn't my question

[Koala]

I have finished my IDX-Pro with the original 950 spool for a while. Now I am experimenting with building another 250mm coil myself. The coil for the TX side is ready and with my single-channel oscilloscope I was able to set the frequency of 6590Hz exactly. Now I am faced with the problem of determining the RX frequency ... Where can I pick up this signal? Nothing useful is displayed directly at the RX output ... thanks a lot

the RX not connected to anything or the RX circuitry will show the TX frequency


you can connect the RX coil and capacitor to the TX to measure the frequency


If you use the inductance and capacitors on page one of this thread everything is golden

[tomec123]

Thank you, that was a good and valuable tip. I now have 2 very good running coils ready. I also noticed that the original Whites coils have bad tolerances, I have 2 Blue Max coils, one oscillates on TX at 6.60 and the other at 6.62Khz. The coils that I made myself are exactly at 6.59Khz and have about 4-5cm better depth than the original ones. Only the DD27 coil can not run properly, despite the exact values, the ground balance cannot be maintained ... always missing sounds when panning ...

[Koala]

if its a DD you made

it matter which side of the null point you use

I can't remember which side works best. But the phase changes and discrimination plus ground balance will be out. If you are right on the null point the coil became twitchy

getting the shielding is also critical for a smooth running coil


yes factory coils under preform but are ultra stable.


I found however carefully I build a coil their always preform slightly different.

[Tibuck19]

Hi all;
IDX Pro PCB Drawing Aid

I like the design, you should also add an on/off switch pinout and a double pull double throw for head phones or internal speaker, perhaps even add a pinpointer toggle switch pinout. just a suggestion.

[gurdal]

IDX PRO AUTO MAN TUNE AUDIO

hi masters,
Is there a sprint layout file belonging to the circuit?
Has anyone ever tested or has a video.

regards
Gurdal

[CDI]

hi masters,
Is there a sprint layout file belonging to the circuit?
Has anyone ever tested or has a video.

regards
Gurdal

This is 2 tone version, i have one pcb for this machine, but not tested yet.

[gurdal]

Hi CDI
Can you scan and add it with scanner.
Let's copy it with sprint layout.
i want to test

[gurdal]

hello good work;

I made concentric heads for the idx pro detector in accordance with the values given. I achieved excellent depths in tabletop tests;
but it does not exceed 20/25 cm in soil.
I need your help on this.

Best regards
Gurdal

[Koala]

hello good work;

I made concentric heads for the idx pro detector in accordance with the values given. I achieved excellent depths in tabletop tests;
but it does not exceed 20/25 cm in soil.
I need your help on this.

Best regards
Gurdal

sounds about right. Does depend on your ground

I get 10 inches on a well worn UK pre decimal half penny.


but that only with less discrimination than you would normally use

[jawad]

Thanks a lot

[Koala]

found some air tests for the original IDX with bills mods and original coils.

Modified IDX Pro w/6?" diameter 5.3 BullsEye coil
Internal Speaker w/audible Threshold
Discrimination at minimum
Toggle at 'Normal' / 'Black Sand'

5? = 7?" / 8"
1? = 7⅜" / 7?"
25? = 8" / 8⅜"

Modified IDX Pro w/6?" diameter 5.3 BullsEye coil
Killer B 'Wasp' headphones w/audible Threshold
Discrimination at minimum
Toggle at 'Normal' / 'Black Sand'

5? = 7?" / 8?"
1? = 7?" / 8"
25? = 8⅛" / 8?"


Modified IDX Pro w/950 coil
Internal Speaker w/audible Threshol
Discrimination at minimum
Toggle at 'Normal' / 'Black Sand'

5? = 8?" / 9⅝"
1? = 9" / 9⅝"
25? = 10" / 10?"

Modified IDX Pro w/950 coil
Killer B 'Wasp' headphones w/audible Threshold
Discrimination at minimum
Toggle at 'Normal' / 'Black Sand'

5? = 8?" / 9⅝"
1? = 9?" / 9⅞"
25? = 10⅞" / 10⅞"


I found by adjusting the Rx capacitor you could increase the distance in air test by a fair bit. However it does not translate into real word improvement in the fields and made the machine unstable, with one exception dry powdery sand. For some reason air and ground closely match here with no negative chatter.


I have seen YouTube videos with nearly 50 cm in air tests. This is possible. Just useless in the real world.


Its been about 10 years since I have used the IDX


from memory you could improve distance by changing the threshold slightly. If you turn it up too High you can't tell how deep targets are.

My pinpoint / all metal mode was effected by which headphones I used. Again from memory I got an extra 1/2" using earbuds. But can't remember if that was before I changes the audio driver transistor.


small thin silver coins on edge were almost undetectable on edge with a stock 8" concentric if you use too much discrimination

[gurdal]

Thanks Koala,
Because of the pinpoint and discrimination feature
I really like.I should look at other projects.
Best regards
Gurdal

[Nandor]

My IDX PRO with the analog meter
Thanks Gurdal for sharing the meter documents!
https://www.youtube.com/watch?v=yDcdlxA6RUM

[dgm]

Hi Good morning Mr. Nandor, I saw your last post, could you post or tell me where I can find information on the counter. Thanks for your intervention.