vlf slow motion

[ossamaussama]

who have schematic for slow motion discriminate vlf metal detector ??

[scs]

Work well . You can put dd coil.

[bernte_one]

hello Sascho,
can you please upload better Quality Picture and pcb layout

many thanks

[ossamaussama]

Work well . You can put dd coil.[ATTACH]36548[/ATTACH]

thanks
but did you try it


what i need is to make lare dd coil 0.5 meter square

and slow detector so i can get good depth

something like coil of deep hunter

[scs]

Ib detectors coil larger diameter bad discovered coins.30 sm is maximal for coins.

[Sean_Goddard]

Go to Silverdogs website.

[scs]

Detector PCB-

[ossamaussama]

Ib detectors coil larger diameter bad discovered coins.30 sm is maximal for coins.

Not for coin my friend but for gold

[scs]

Discovered this gold well.

[WM6]

Discovered this gold well.[ATTACH]36553[/ATTACH]

Problem is thatossamaussama has something like gold at 6.66 meter deep, according horoscope, but he doesn't know where or what.

[Davor]

I'm all for a slow motion detection, and compressed audio. For real slow motion you must take care about the 1/f noise in gain stages, or otherwise you get a very decent LRL. I'd go even as far as to replace FET input op amps with bipolar, or even a chopper.

[ossamaussama]

Problem is thatossamaussama has something like gold at 6.66 meter deep, according horoscope, but he doesn't know where or what.

No my friend pi metal detector is deep but not good for gold

I know place where is gold. But cannot dig every were.



Any one test deep hunter will know what I mean slow motion needed for large Vlf DR coil

[ossamaussama]

I'm all for a slow motion detection, and compressed audio. For real slow motion you must take care about the 1/f noise in gain stages, or otherwise you get a very decent LRL. I'd go even as far as to replace FET input op amps with bipolar, or even a chopper.

You are smart

low gain but high saturation time give slow motion or no motion

[Davor]

Well, almost. Compression gives you slow motion feel even with a machine that cuts motion well above 1Hz, but only for strong targets that get compressed. Small deep targets are not treated this way, and it is good to lower the HPF motion filter frequency to as low as possible to have that same feeling.
With lower frequency come 1/f and drift, which manifests as false targets, hence my LRL remark.

[ossamaussama]

Well, almost. Compression gives you slow motion feel even with a machine that cuts motion well above 1Hz, but only for strong targets that get compressed. Small deep targets are not treated this way, and it is good to lower the HPF motion filter frequency to as low as possible to have that same feeling.
With lower frequency come 1/f and drift, which manifests as false targets, hence my LRL remark.

According to this can you modify idx to become slow without lose depth on large target?