Alonso PD modification

[Geo]

Hi.
I attach 2 photos of the modifications that i made to the PD of Alonso.

[takhslambos]

lrl

it is working?

[Funfinder]

This is absolutly cool, Geo, because you are really working with this interresting device - in both directions!

What's the adventage of your new mod?

[Morgan]

PD

Hi.
I attach 2 photos of the modifications that i made to the PD of Alonso.

I can see 3 modifications :

1- Coil instead of ferrite

2- Two potentiometers (Tune,and fine tune) for better adjust in the limit.

3- Square TX coil ??? Not the Omega...

[smity]

There is a normal video of this product? Coin in the ground can be found? Where to see the scheme, and a list of components, PCB?

[Geo]

it is working?

For the time, only with aluminium objects.
I changed the frequencies but i have not time to check it. Maybe at September when i will go for treasure hunting to check it.

[Geo]

This is absolutly cool, Geo, because you are really working with this interresting device - in both directions!

What's the adventage of your new mod?

It is very calm!!!
It do not need to adjust it at the critical point

[Geo]

I can see 3 modifications :

1- Coil instead of ferrite

2- Two potentiometers (Tune,and fine tune) for better adjust in the limit.

3- Square TX coil ??? Not the Omega...

Square coil is in the place of the ferrite!!!!
There is another coil at the rear place of the box (you can see it).
Potentiometers are ... one for sensitivity and the other to control the min signal that needing the beep generator to go On (about the same with trs_hold.

Regards

[Geo]

There is a normal video of this product? Coin in the ground can be found? Where to see the scheme, and a list of components, PCB?

Sorry, no video for the time!!

[Morgan]

New PD

Square coil is in the place of the ferrite!!!!
There is another coil at the rear place of the box (you can see it).
Potentiometers are ... one for sensitivity and the other to control the min signal that needing the beep generator to go On (about the same with trs_hold.

Regards

I supose you use square coil instead of RX ferrite and a small round coil behind as oscillator,like stimulator in the DCH 85 MINEORO...

Maybe

[Geo]

I supose you use square coil instead of RX ferrite and a small round coil behind as oscillator,like stimulator in the DCH 85 MINEORO...

Maybe

Hi
Yes.... about.
Also i combinate the two signals

Regards

[Funfinder]

Geo, this sounds very intererresting.

So if now alu only gets detected does it use the same kind of metal-discrimination like conventional MDs?

The disc range usually is:
mineral -> little, old rusty iron -> noble iron -> iron balls -> cheap & small alu foil -> gold -> gold alloys -> copper -> silver -> aluminium

Or is there really some "resonant-frequency" for special metals?

[Geo]

Geo, this sounds very intererresting.

So if now alu only gets detected does it use the same kind of metal-discrimination like conventional MDs?

The disc range usually is:
mineral -> little, old rusty iron -> noble iron -> iron balls -> cheap & small alu foil -> gold -> gold alloys -> copper -> silver -> aluminium

Or is there really some "resonant-frequency" for special metals?

I am not sure about resonant-frequency. At first it worked at 150Khz.
Now i tuned it at lower frequency but i did not test it.

[nelson]

Hi Geo.
I m trying to find this circuit of Alonso PD, but there is a lot of informatión here in the forum. So can you or anyone tell me where to look for any geotech link to find the circuit and pcb.
I know the circuit was publish here and also pcb´s, that previusly i saved to my old hard disk that is broken now.
In advance many thanks
Regards
Nelson
email: ce3llp@mi.cl

Hi.
I attach 2 photos of the modifications that i made to the PD of Alonso.

[Funfinder]

@ nelson
It wasn't published on this forum but here (btw. WM6 is an Admin there):

http://hobidetektori.own0.com/lrl-f6/pd-pistol-t637.htm

(see also Remote Sensing -> "artemis"): http://www.geotech1.com/forums/showt...t=16692&page=2 )

@ Geo
So if it works with 150kHz a modified Long Wave Receiver should work! This IS very good news, thx Geo!

btw. now with this new info I'm shure it's the BFO metal-distinction and not some resonant-frequency.