Zero Voltage Transmission (ZVT)

[gdogg]

Hi all, im really interested in this new technology, GPZ7000 by Minelab. may be we can start on this new thread. also ive got a pic of the new coil used.

[greylourie]

The coil construction is very interesting to look at. What is clear, is the labeling, for start/end of wind, on each individual coil.
Also interesting is the rectangular cross-section of the bundle comprising the TX. The wire used in the tx, reminds me a little of the braided solder wick you can buy. Obviously, in this case, the individual strands are coated with insulation. And it might not be braided, it could simply be twisted. The colour variation, that can be clearly seen in your image, could give hints to twist/braid rate.

For TX generation maybe get inspiration from this thread here : http://www.geotech1.com/forums/showt...ulse-Induction

[gdogg]

i have found pics of the circuits gpz7000 document(2).pdf

[greylourie]

i have found pics of the circuits gpz7000 [ATTACH]32335[/ATTACH]

Those are nice pictures. What do we see if we look at them ? Nice images of gps, display and audio rx module. Sadly no images of the real bits for a detector. The main board.

But its good to look at pcb images. Via stitching on the gps module.
And the display/UI board has what looks like a border for placement of a can/shield over the pcb. So that means that the microSD is not user accessible ? I think it will be a boon for some users to be able to plot and store find locations to within a few metres.
I guess this UI pod with gps/screen/UI controls and processors and linux, has been ported over from the ctx3030 ? Same for the audio tx and rx modules. That should have reduced development and production cost considerably.... compared with coming up with a completely new UI and audio solution.

That being the case, can any ctx3030 users comment on the possibilty to remove or access stored gps info by any means other than via usb or the built in screen ?

[lucifer]

Very nice design of the SuperD coil! Note also there's no shield for any of the coils. Tx probably made of Litz wire. Rx coils placed a bit closer to the ground.

[kt315]

i have found pics of the circuits gpz7000 [ATTACH]32335[/ATTACH]

damaged. please re-upload this pdf.

[sinclairuser]

Very nice design of the SuperD coil! Note also there's no shield for any of the coils. Tx probably made of Litz wire. Rx coils placed a bit closer to the ground.

the shield will be graphite either painted on the shell or on a paper disk, its only missing for bench testing.

[lucifer]

And what's the purpose of the small PCB in the center?

[localbug]

Implementing H bridge to metal detector??

how they manage to receive the signal from the target if tx always on??

[Skippy]

Switches 57,58,59,60 have independant control signals from the controller (microprocessor) so they can achieve OFF, + ON, - ON, as needed.

[localbug]

probably I can use my l298 hbrige motor driver.

regarding front end receive, how that works skippy??

[Skippy]

Apologies, I know very little about PI machines.

[localbug]

Apologies, I know very little about PI machines.

so do I

I was wondering are they using the same PI Front End principle like we found here in this forum.