IDX-PRO+VDI

[Koala]

if I was to build a new coil for my IDX I think I would be tempted to try an omiga style

Seem to be getting good results on the Russian metal detecting forums. Its alleged to have the same VDI and pinpointing accuracy as a concentric but punches through mineralized ground more like a DD.

https://www.google.co.uk/search?q=%D...ih=486#imgrc=_

[wallker]

whites 6.59kHz coil has a cap inside. you have to connect outer cap to tx winding, value in range 0.5-1.0uF.

Hi kt,
I did connected caps, my coil is open, still in bench mode, connected just for testing purposes.

[wallker]

IDX SMT Layout

Added R41, R46.
Corrected connection of C5, C6, R24 and VR3.
Bom may need to be updated.

[kt315]

whites 6.59kHz coil has a cap inside. you have to connect outer cap to tx winding, value in range 0.5-1.0uF.

[wallker]

Just finished assembling the IDX smd board, that Koala posted.
Corrected PCB a bit, and it works.
I was too impatient and just wanted to see does it works, so i conected fast-wound 0.7 mm wire for tx coil and rx from IGSL.
Poor detection due to bad coil specs and off resonce, but still works.

[wallker]

Thanks for confirmation.
I was just too lazy to draw correct symbol.

[kt315]

this way

[wallker]

yup. almost. just add Zener diode on outputs of the comparators.

typical mistake that you do not want fix and notice.

thx for heads up kt315.
Is this way ok?

[dbanner]

Question, IDX Pro red board, With my Scope in XY, Channel 1 probe on X and Channel probe 2 on Y, GB goes up and down, would that not be 0, Should it not be at the -95 - +95 left to right ? by switching the probes it does switch the GB alone the 95 Plain. With a Nickel it is being detected in the negatives not the positive, look at the little sketch please and tell me what you think. Seems like everything is all bunched up together besides Nickels and ferrous metals. I do not know if it is they way I have my Oscope set up or if there is a problem with the detector, the scope is Plugged right in to the detector with out a MCP602

[ATTACH]45058[/ATTACH]

Isn't the mcp602 setup on one side as inverting amplifier?

[dbanner]

Isn't the mcp602 setup on one side as inverting amplifier?

[wallker]

original is powered by 12v

starts to fail when the unloaded pack measure around 9.5V

runs at +4 and -4 so needs 8 volts. But there is also a voltage drop on the protection diode

Thanks for clarifying that Koala.

[Koala]

original is powered by 12v

starts to fail when the unloaded pack measure around 9.5V

runs at +4 and -4 so needs 8 volts. But there is also a voltage drop on the protection diode

[wallker]

Should this MD run on 8 or 9 volts?

Or even less, 4V, as shown on schematic???

[kt315]

yup. almost. just add Zener diode on outputs of the comparators.

typical mistake that you do not want fix and notice.

[wallker]

Is this the correct version of schematic to compare with?


Also does anybody have it in sch file?