deep vlf metal detector

[ossamaussama]

this is my new deep vlf metal detector
12 khz high power tansmitter

40*80 coil
discrimination with led

https://www.youtube.com/watch?v=oxnZaFIDABQ

https://www.youtube.com/watch?v=F8hhN6m30Aw

https://www.youtube.com/watch?v=9LEoe2vR-Oo

[godigit1]

Hi ossamaussama,
What type of ground balance are you using?
Auto, Manual ,Preset?

[ossamaussama]

manual ground balance
the coil is made using fiber glass anf it is heavy
i will post sechmatic and pcb later

[ossamaussama]

https://www.photobox.co.uk/my/photo/...d=501970155203

[Nandor]

It sounds like a Pulse Induction machine.

[ossamaussama]

no it is vlf

[ossamaussama]

[ossamaussama]

coil is like DD

[Andi68]

Awesome

[Nandor]

Pulse induction machines also have DD coils. Maybe this detector has pinpoint mode.

[ossamaussama]

Pulse induction machines also have DD coils. Maybe this detector has pinpoint mode.

no my friend it is really vlf static mode with discrimination

[ifrenide]

Hello ossama. It's not bad MD. but not deep at all. because with such a big metal boxe you tested it with, you should have maybe 2 meter or more, because the coil is really big, normaly we expect a long detection distance.
best regards.

[ossamaussama]

Hello ossama. It's not bad MD. but not deep at all. because with such a big metal boxe you tested it with, you should have maybe 2 meter or more, because the coil is really big, normaly we expect a long detection distance.
best regards.

you are right but the coil is 40/80 and not tested with max sensitivity , i decide to make another 50*100cm coil but big problem is weight try to find another method rather than fiberglass

advantage over pulse induction is discrimination and sensitivity to gold frequency is 12 khz will not suffer from interference from 50hz powerline


i forget some details
there are two mode
1- slow motion
2- fully static mode
mode 2 goes deeper than you see in video it reach 1.5 meter easy
i will post another video

later

[godigit1]

Hi ossamaussama,
Can you give a example of your disc on large items?
Maybe place the items on the ground and swing the coil over them to hear ground response as well as target response. If possible disc out a coke can and still hit a large peice of real lead.
And What is the depth loss at those disc levels?
Thanks

[ossamaussama]

Hi ossamaussama,
Can you give a example of your disc on large items?
Maybe place the items on the ground and swing the coil over them to hear ground response as well as target response. If possible disc out a coke can and still hit a large peice of real lead.
And What is the depth loss at those disc levels?
Thanks

ok i will do that later and upload video

there is no ground response because of ground balance circuit