IDX-PRO+VDI

[golfnut]

maybe your right I cant quite work it out now you've said!

[Silver Dollar]

Well pin 1 of the 393 gets pulled negative so cuts off the 2nd tone when the PP button is pushed...

[golfnut]

I think that the Pin point is a bit of an optical illusion,, The Pin point text is for the Switch. Not the 2 tone mod..

[Silver Dollar]

Here's a 2 tone mod that seems to only work in PP mode;

[ricalbertvig]

Support 2 tones?

can someone tell me what part I find the way to put a switch for the 2 tones, not having to replace components .. is that I saw somewhere I've searched and can not find it .. I need if anyone can help me with part in the forum where it gets a switch for 2 tones?

[salih]

I can detect the coin of copper and aluminum 2.4mm in the air 33cm
And also 4 * 4 mm copper nugget in the air 10cm
my coil =TX 17.5cm RX 8cm Similar xlt But with different lengths and taking into account the frequency

Please give me tips
1-depth sensitivity in the ground is weak compared to the tests the air?
2-We have two votes pin point and natural sound Imagine no regular land. Supposed to adjust the GB to be one in a pin point or natural sound. I have a problem in a pin point I have to adjust the GB if I'm back to normal voice I have to adjust the GB again ????

[holyuser]

Will be soon. Be patient.

[emoxristov]

Please upload simulation Proteus for VDI

[zoomix]

Off-handedly,

Could we use a Potentiometer of say 10ohn or 2ohm between the RX Coil and the OpAmp - and just use a constant 33nf cap,
- instead of fidgeting with different Capacitors around 33nf ?

Wouldn't this be easier to adjust ?

Jlsilicon, I think I do not need capacitor on tx and RX because I have an original coil loop 950

Everything works fine ... there was a split in path on the PCB lugatek.

Completely Invisible. I saw with meter. DM-1 lugatek ok

Thank you for your help ..

[jlsilicon]

Off-handedly,

Could we use a Potentiometer of say 10ohn or 2ohm between the RX Coil and the OpAmp - and just use a constant 33nf cap,
- instead of fidgeting with different Capacitors around 33nf ?

Wouldn't this be easier to adjust ?

[jlsilicon]

You connect ADC0 to X and ADC1 to Y on the IDX board.
Or, you can connect ADC0 and ADC1 to the Outputs from U3B p1 and U3D p14.

The Diode(s) are on the IDX Board.

hello,

Can you give me more info on adding two diodes?

A Where you place these diodes?
Is the 1N4148?

VDI geotech module does not respond to a good distance.

I 've realized the VDI lugatek module and I have a +45 display on steel.

On the oscilloscope, the X and Y outputs are 400mV (PCB IDX)

Can not set to 0 for aluminum, potentiometer 4K7 has no influence ..

About VDI input schema, Somebody could tell me if this is an integrator assembly / diverter or differential amplifier ?

What part I could change to improve reception?

Thanks

[zoomix]

hello,

Can you give me more info on adding two diodes?

A Where you place these diodes?
Is the 1N4148?

VDI geotech module does not respond to a good distance.

I 've realized the VDI lugatek module and I have a +45 display on steel.

On the oscilloscope, the X and Y outputs are 400mV (PCB IDX)

Can not set to 0 for aluminum, potentiometer 4K7 has no influence ..

About VDI input schema, Somebody could tell me if this is an integrator assembly / diverter or differential amplifier ?

What part I could change to improve reception?

Thanks

[jlsilicon]

So,
I rewrote the Arduino Code to input an Array of values,
- and now I get a lot better clarity in the data.

I think I will add another OpAmp to increase the Gain more.
I don't need to read the data at 2cm range;
- its not used in the field at that range anyway.
The results are skewed that close to the coil.

[jlsilicon]

Well, I have a larger voltage Reading - which makes it clearer on the Arduino.

But, talking to the LCD slows down the Readings (like 10 actual Target Readings after the 85 average).
What I want to try to do - is to Buffer an Array of readings, then process these to the LCD and so on - yielding more Data to analyze for accuracy.

Also, I am going to insert a Jumper or Switch for the Diode(s) - and also use 2 Diodes.

As for Range, I had about 40cm-60cm on my model in Europe.
But, now I am only getting about 10-15cm in rebuilding it - since I returned to FL.

I think my European model that I built also had a few of the Mods added - which might have helped.
I intend to hook it up this week and try it again.

hello,
I realized for the VDI IDXpro and I had a problem with the distance. VDI gave me an answer but 5 or 10cm max. I checked with the oscilloscope and I saw that the signals are very weak.
For information, my IDX features an original 950loop coil and takes 1 euro to 40cm
I realized the DM-1 VDI lugateck and I have exactly the same problem.
I've seen video of the IDX + VDI or VDi lugatek that works perfectly. Response of VDI at the same distance as the detector ...
jlsilicon,
Do you have improved reading about VDI using X / Y on the output U3B p1 and p14 U3D?
thank you for your help

[zoomix]

yes you can, there will be more sens to getting the vdi to work.. The down side is the diode - this limits the signal to 0.7v positive so on a reasonable target the vdi phse will read wrong as the diode clips the signal.

using a vdi on machines this simple is not really a great idea.

A gain control is needed to kepp small signals big and big signals small. Then clipping, or compression is eliminated, and real signal levels are maintained on disc and geb ch;s the result is a good phase number.

To do this u normally reduce the Tx signal when large targets appear. Or reduce th preamp gain as large targets appear.

on a beep no beep machine like idx, phase angle info was never designed in, as the diode limiter messes it up.

hello,

I do not understand much about the diode ... The IDX Version of silverdog without diode. Both VDI model That I do not make diode on the hand AOP.

Can you tell Specify qui diode You Because I am not an expert in analog electronics? Possibly the gold exchange needed to Improve?

thanks