IDX-PRO+VDI

[golfnut]

simple machunes are not good candidates for VDI as the VDI doesnt see small targets. The vdi can give the wrong numbers with large targets.

Macines with an AGC of some sort are good for VDI as the VDI cicuit can display samll target, low amplitude signal phases and Large target signal phases too. ##

[sinclairuser]

Simply put, no. They would need to be cranked up to around 20ma per LED......
regards
Andy

i'm sorry but i dont agree, 2ma low energy led's are 64p each at maplin and come in 4 colours, we are talking about 7 leds and multiples of 7, so 2 would be 14ma, 3 would be 21a, thats nothing in the grand scheme of things.
the vdi is not very good anyway, so this is moot, its much better to use the power to generate another tone,(imho).
but dont be discouraged, ampirate, if thats what you like go for it, just factor in the power requirements when you do the battery pack.
i have allways liked oled displays personally, but thats just me, at the end of the day with a modern battery pack, there is more than enough power for any display you like(if built right).

[der_fisherman]

Everyone here builds what he wants to build.

Many others here may be so kind as to attract his or her attention to some possible problems resulting from the use of certain components or ideas.

If he/she wants to ignore that advice, thats fine with everyone here.....

But will you be able to see them still in strong sunlight at that power.....best to test and see......

I could not find them at Maplin, so would you be so kind as to post the part number and or the weblink at Maplin so that I can see them for myself.

Using your "low energy LED" or "low power led" did not find them, but many other items fit the search argument as well.....if I search using "2ma" as well, no results are found.....

They would be interesting to know about just in case I ever need something like that....

Thanks in advance.

[golfnut]

I keepp looking for a simple way to do tone ID.

The thing in my mind is, use the signals on the channels to give the tone freq, like this.

With Iron, the signal goes negative on one of the channels and pos on the other
With bronze signal goes positive on both shannels.

With this in mind I want to sum the Disc and Geb signals --

So Iron is approx +x with -x
bronze is +x with +x

If the summer amp out fed a VCO ( rather than existing fixed tone) you get a range of frequencies for ID.


As long as the audio VCO could steer a bit lively, so when the amplitude trips on the comparator you hear a tone representing Fe or non Fe.

You could get decent silver to be one extreme.

S

[fabio-evo]

I finally finished my idx-pro, I'm very happy with the performance, 2 euro are heard in air at 42 cm and 30 cm below ground.
1 euro is heard at 28 cm below ground.

http://s740.photobucket.com/user/ven...60aaa.mp4.html

[Silver Dollar]

For tone ID the Russians have created a Cibola clone and used a PIC 16F73 to do the tones.
Here is the hex and the wiring;

[sinclairuser]

http://www.maplin.co.uk/p/3mm-red-led-cj55k
these.

[6666]

fabio-evo

Could you please tell me what is the Whites coil you are using on your Idx
thanks

[fabio-evo]

the coil and 'a Blue Max 950 Loop (6:59 kHz) taken from the site's white's uk

[6666]

the coil and 'a Blue Max 950 Loop (6:59 kHz) taken from the site's white's uk

Thanks for the info

[akasyto]

Tone id

Tone id with 2 tones ,in all metal mode and disc mode.

[golfnut]

nice, I tried something similar one time wuth a fet in as the resisor in the tone oscillator - I wanted the delta between the two channels to adjust the RC time const of the tone geb but I couldnt get it to work

[ampirate]

I finished my IDX PRO from Silverdog last week. I just tested it with my 27cm D-coil yesterday.
But, I still only get a range of about 3-inches. Same results as my home-etched Board.
I assume that this is a Coil problem then.

I followed the instructions as close as I could. But, I do not have an InductanceMeter.

Does anybody have a clear Windings-# and Rx and TX individual Circumferences for 0.2mm and 0.7mm Wire for a 27cm Coil ?

The Instructions always specify the total Diameter of 27cm for example - which varies by opinion.

[porkluvr]

I assume that this is a Coil problem then.

Another possibility is a bad 1uF capacitor. Have you tried a quality polyester unit or are you using -ceramic- ?

[ampirate]

My components are from the silverdog kit.
They should be polyester.