Super TGSL With H Bridge TX Diff RX Quad Sampling

[Hyena]

FullQuadTGSL cor Silver FET PP V5_1.JPG
https://www.youtube.com/watch?v=3SPuarDiRds
This video of the work of the device according to this scheme, if so, then-super!
Thank you
Thank you

Detector on video is http://www.geotech1.com/forums/showt...php?17861-IGSL

I am not sure if audio in schematics is single tone or some kind of VCO...

[nikko10]

FullQuadTGSL cor Silver FET PP V5_1.JPG
https://www.youtube.com/watch?v=3SPuarDiRds
This video of the work of the device according to this scheme, if so, then-super!
Thank you
Thank you

[Hyena]

Judging by the silence in the subject, she "fell" irrevocably, and it's a pity, I wanted to repeat this device. All the same, can anyone answer the question: is it a two-tone device? Somewhere I watched the video of the work, I liked it very much, but I can not again find this video, skinte please link. Thanks

Which schematics you are talking about?

[nikko10]

Judging by the silence in the subject, she "fell" irrevocably, and it's a pity, I wanted to repeat this device. All the same, can anyone answer the question: is it a two-tone device? Somewhere I watched the video of the work, I liked it very much, but I can not again find this video, skinte please link. Thanks

[nikko10]

Hello, I liked the project, I would like to collect, who already uses this metal detector and what impressions? As for the winding of coils, on some page I saw data on the number of turns: Tx-45, RX-280 rolls (what wire diameter?). The small question is: the transmitting coil is 12.5 kHz, the frequency of the receiving coil is the same, or there is a frequency difference.

[ne555]

Copper Wire Diameter 0.30mm Rx = 107 turns Tx = 98 turns What is the diameter of the coil 27 cm? And a tin shield for each to rx and tx thank u sorry for my English so bad

[Nandor]

Hi
Use the same as for TGSL.
0.25mm-0.30mm Cu wire for coils. Please read the TGSL topic there is everything you need!

[ne555]

Hi
What information the coil rx and tx the awg and circle's radius and turns the shield to rx and tx??? Please answer thanks for all

[TreasureHunter]

Hello!

Any news in 2016 about this one?

[Mike]

I could throw in some multi-frequency tricks to make it all even more interesting.

That would be very interesting, indeed I'm not sure I've seen any multi-frequency IB/TR projects anywhere.

My day job and my family obligations will surely slow my pace, but I'll get there.

Real life has to come first of course, but it's great to know this project is still ticking over. Thank you

[Davor]

It is not that simple. There is no such rig available for reverse engineering and of all rigs on the market I suspect only Deus to be doing something of the sort. As mentioned above, there is a lot lost in traditional discrimination processing. There is no way to convince a traditional discriminating rig to do it properly, so the only way to do it good is from the scratch.
On the plus side, being detached from the old ways, I could throw in some multi-frequency tricks to make it all even more interesting. My day job and my family obligations will surely slow my pace, but I'll get there.

[Thomas]

To go beyond its limitations you need to do a few things differently.

Don't leave me in suspense, what might be done differently? I've been trying to decide what would be a good project to spend my time on.

[Davor]

Discrimination when done by gating GB channel is always less deep because both GB and discrimination channel must be ON simultaneously, and at discrimination edges (on both sides) sensitivity is low. It could be remedied if there is no offset at any channel, and if there is no gating, but instead frequency modulation or some other way of indication. The most sensitivity is lost in anti-chatter and threshold circuitry.
In short, TGSL is a representative of a typical gated discrimination VLF. To go beyond its limitations you need to do a few things differently.

[ashefr10]

OK damage because the TGSL has exemplary discrimination but is less powerful

[Davor]

Amplitude modulation of the Tx signal spoils depth, so the best option is to keep amplitude close to maximum that is limited by power rail and consequently with low amplitude modulation, but not all the way to maximum to keep harmonics low. If it is tuned correctly, it will be, say, 5% lower than absolute maximum. Going for the maximum spoils harmonics, and they also reduce depth.

To experience any significant depth improvement, you'd need double amplitude or more. To do that you'd need a completely different topology of oscillator.