PLL Metal Detector ?? did someone.... ??

[epitopios]

some help if someone make it ???

http://www.geotech1.com/cgi-bin/pages/common/index.pl?page=metdet&file=projects/kraus/index.dat

down the page :
Comments/feedback/notes:
Several people have built this circuit and have had problems getting it to work.


so it is true that it doesnt work or someone make it to work ???

[WM6]

Try this version. Can be usable as gold detector.

[chemelec]

some help if someone make it ???

http://www.geotech1.com/cgi-bin/pages/common/index.pl?page=metdet&file=projects/kraus/index.dat

down the page :
Comments/feedback/notes:
Several people have built this circuit and have had problems getting it to work.


so it is true that it doesnt work or someone make it to work ???

That one Doesn't Work.

The One Posted above by WM6 Does work.
But I'm Not very impressed with the Sensitivity.

[epitopios]

Try this version. Can be usable as gold detector.

dear WM6 , unfortunately your foto doesnt open to have a better look
and as chemelec said what about increasing the sensitivity ?
friendly , epitopios

[WM6]

dear WM6 , unfortunately your foto doesnt open to have a better look
and as chemelec said what about increasing the sensitivity ?
friendly , epitopios

I will try better resolution.

Sensitivity depends on how you build it , supply voltage, paired transistors, coil / but chemelec is right > this is not LRL.

[Geo]

I made it before many years (25+) and it worked.
Epitopios... call me

Regards

[Morgan]

pll

I made it before many years (25+) and it worked.
Epitopios... call me

Regards

hi

and you remember air test distance in one coin ?

[Morgan]

PLL

I made it before many years (25+) and it worked.
Epitopios... call me

Regards

I built this one,posted by Esteban,but cant put it to work...
Its interesting becouse as only one single coil turn.

[WM6]

I built this one,posted by Esteban,but cant put it to work...
Its interesting becouse as only one single coil turn.

[ATTACH]13976[/ATTACH]

Hi morgan, did you check this (best by scope):

[Geo]

hi

and you remember air test distance in one coin ?

Hi.
About 20cm for a coin.
It is not something special, it is a BFO using a PLL, so it need a simple mono coil.

[dfbowers]

PLL IB

Hi.
About 20cm for a coin.
It is not something special, it is a BFO using a PLL, so it need a simple mono coil.

Yet another..

[Morgan]

PLL

Hi morgan, did you check this (best by scope):

Thanks,i will try.

[Geo]

To Epitopios

Hi Pano. As i see the schematics, i had make the schematic that WM6 posted here. I am sure about this.

Regards