Delta Pulse

[hl54]

hl54

Hi dear geo
my intend these Pictures duple coil instead one coil.
is it enough two Pictures good ?
those coils are for gold scan.
Regards

[Geo]

Hi hl54.
Photos are OK But..........
Delta Pulse is designed for mono coil use.
A DD coil or a OO coil are not for gold detection at PI detectors.
They used to cancel at a degree the electromagnetics interjections.
At my country i used DD coil with PI only once that i wanted to detect a place under a HV line (400KV).
The photos that you attached was for a VLF detector (from Golden Sabre thread) not for a PI. So for the Delta Pulse try a mono coil.
If you want a detector to discriminate gold then maybe a VLF is better
Regards

[hl54]

hl54

dear geo
thanks a lot for reply.

[erolunall]

Dear hl54

You can take true pcb from below link.

http://www.savefile.com/files/1018088


Regards
Erol

[nelson]

Hi Ivconic. Finally i fix my problem with one side pcb for delta pulse.
The real problem was with some resistors, that i confused btw 2.2 K and 22K, shame on me.
So this of course burns some components and made the detector working unstable.
I still don´t have an osciloscope, so i decided to replace 556, two 4066 and two 4538. Now DP is working very good. For test purposes i used two coils, the first one is 19 centimeters in diameter, 447uH and 1.9 ohms.
The results were:
1.- IRF740, after half an hour, did not got hot, just a little warmer.
2.- Air test for a 1 cm aluminim coin, 18 cms
3.- Air test for 17 cm copper coin, 26 cms
4.- After 40 minutes, the unit performed very stable and all functions are working very good.

Question: how and were do you measure frequency?.

I did by just checking with my tester both coils terminals, and i measured 121 Hz . Is this ok?

Second coil test:
1.- Coil was made from 0.25mm wire, inductance is 580uH, 26 cm in diameter and resistance is 7.2 ohms.
2.- IRF740, after half an hour, did not got hot, just a little warmer.
3.- Air test for a 1 cm aluminim coin, 16 cms
4.- Air test for 17 cm copper coin, 28 cms
5.- After 40 minutes, the unit performed very stable and all functions are working very good.

I hope this test can help.

Has i understand, we can make any coil diameter, but we must follow that the inductance and resistance remains the same, independent of the form and size we whant. Is this correct?

In advance, many thanks.

Nelson

QUOTE=ivconic;48495]
I just finished my fifth DP in this year.What to say? Somehow i feel satisfied
with progress i made building those.
Every of those five working very good from a start. No problems at all.
I reached the point where can be free to claim that my "machines"
are good and pretty accurate.
But i still have a lot of problems with coils!?
I just downloaded "Making a Fast Pulse Induction Mono Coil" from Joseph J.Rogowski
aka bbsailor.
Congratulations on such fine,neat and accurate theory bbsailor! I do agree 100% on
all you've been talked about.
I just made a coil; 26cm diamm. 25 windings, wire 0.35-0.4mm(close...i cant tell,i
busted my mickrometer last week)....Resistance of a coil is 3.3 ohms.
Buster is 2K2,frequency is 120Hz....
Results are good. 2cm coin it can detect on 30cm distance.I guess,it could be even
much better.
It is now in "experimenting" phase so i am not using any resistivity in serie with
coil....so it is just 3.6-3.8 ohms(including cable).
After 5-7 minutes, IRF740 is still cool!?
I am, sort of confused,amazed???
But there is a certain problem. "Playing" with Treshold knob, i can put device
in position to be unstable and "sing" like canarian???? Even than,detection is
very good,fet remains cold and nothing bad happened????
I am presuming it must be something about coil, resistance or dumper....
Between those five DP's i made,this last one is the very best...i have that
feeling. I also payed a lot of attention on components. I used mostly pp caps,
wherever it was possible.I used 1% resistors also....
It will need some more experiments to establish right values of dumper and serial
resistors,but so far it is acting very good.
Until now,all previous DP's needed coil with resistances over 6 ohms, to remain fet
calm and cool,this is first one working cool with <4 ohms coil.....so far.
I will experiment more,these days.If discover something interesting i'll post here.
regards

Merry Christmas and happy new year to all!!![/QUOTE]

[nelson]

Hi Ivconic. Finally i fix my problem with one side pcb for delta pulse.
The real problem was with some resistors, that i confused btw 2.2 K and 22K, shame on me.
So this of course burns some components and made the detector working unstable.
I still don´t have an osciloscope, so i decided to replace 556, two 4066 and two 4538. Now DP is working very good. For test purposes i used two coils, the first one is 19 centimeters in diameter, 447uH and 1.9 ohms.
The results were:
1.- IRF740, after half an hour, did not got hot, just a little warmer.
2.- Air test for a 1 cm aluminim coin, 18 cms
3.- Air test for 17 cm copper coin, 26 cms
4.- After 40 minutes, the unit performed very stable and all functions are working very good.

Question: how and were do you measure frequency?.

I did by just checking with my tester both coils terminals, and i measured 121 Hz . Is this ok?

Second coil test:
1.- Coil was made from 0.25mm wire, inductance is 580uH, 26 cm in diameter and resistance is 7.2 ohms.
2.- IRF740, after half an hour, did not got hot, just a little warmer.
3.- Air test for a 1 cm aluminim coin, 16 cms
4.- Air test for 17 cm copper coin, 28 cms
5.- After 40 minutes, the unit performed very stable and all functions are working very good.

I hope this test can help.

Has i understand, we can make any coil diameter, but we must follow that the inductance and resistance remains the same, independent of the form and size we whant. Is this correct?

In advance, many thanks.

Nelson

QUOTE=ivconic;48495]
I just finished my fifth DP in this year.What to say? Somehow i feel satisfied
with progress i made building those.
Every of those five working very good from a start. No problems at all.
I reached the point where can be free to claim that my "machines"
are good and pretty accurate.
But i still have a lot of problems with coils!?
I just downloaded "Making a Fast Pulse Induction Mono Coil" from Joseph J.Rogowski
aka bbsailor.
Congratulations on such fine,neat and accurate theory bbsailor! I do agree 100% on
all you've been talked about.
I just made a coil; 26cm diamm. 25 windings, wire 0.35-0.4mm(close...i cant tell,i
busted my mickrometer last week)....Resistance of a coil is 3.3 ohms.
Buster is 2K2,frequency is 120Hz....
Results are good. 2cm coin it can detect on 30cm distance.I guess,it could be even
much better.
It is now in "experimenting" phase so i am not using any resistivity in serie with
coil....so it is just 3.6-3.8 ohms(including cable).
After 5-7 minutes, IRF740 is still cool!?
I am, sort of confused,amazed???
But there is a certain problem. "Playing" with Treshold knob, i can put device
in position to be unstable and "sing" like canarian???? Even than,detection is
very good,fet remains cold and nothing bad happened????
I am presuming it must be something about coil, resistance or dumper....
Between those five DP's i made,this last one is the very best...i have that
feeling. I also payed a lot of attention on components. I used mostly pp caps,
wherever it was possible.I used 1% resistors also....
It will need some more experiments to establish right values of dumper and serial
resistors,but so far it is acting very good.
Until now,all previous DP's needed coil with resistances over 6 ohms, to remain fet
calm and cool,this is first one working cool with <4 ohms coil.....so far.
I will experiment more,these days.If discover something interesting i'll post here.
regards

Merry Christmas and happy new year to all!!![/QUOTE][/QUOTE]

[ivconic]

Yes it is correct up to some radius. I have tested this up to 70cm coil radius(diammeter). But certainly it is not the same in detecting different types of metals as you saw in your experiments.
Regards!

[nelson]

Hi Ivconic and thanks for helpping me with my results.
Now i m working on the circuit housing and after that i ll perform some field test.
A 1 by 1 meter coil is my real interest with delta pulse. I need it to search for possible lost treasures on the coast side, close to Santiago, the capital of Chile.
Regards

Nelson

Yes it is correct up to some radius. I have tested this up to 70cm coil radius(diammeter). But certainly it is not the same in detecting different types of metals as you saw in your experiments.
Regards!

[erolunall]

Hi all
I wonder can we use computer IDE cable for making coil .
connecting wires on IDE cable to get coil
it contains 40 wires.if we use 2 ide cable get about 35-40 cm radius
if somebody want to try...
Regards
Erol

[nelson]

Hi, i made a coil with a form like this, the base of the is 35 cms and the front side is 25 cms of pvc. I also used pc net cable (8 wires).
I place 3 turns inside the pvc form and i made 6 wire joins, this gave me 535 uF.
The results are excellent. 1 cms coin is detected at 15 cms. A 2 cms coin at 28 cms, a solder grease can (6.6 cms in diameter at 40 cms) a metallic fence at 1.5 meters. What can i said? I m realy satisfied with delta pulse.
Now i m looking for a good case and to do some real field test.
When i have the time i will post my coil pictures.
I also tried a 19 cms round coil with good results for smal and medium side metals.
Regards
Nelson

Hi all
I wonder can we use computer IDE cable for making coil .
connecting wires on IDE cable to get coil
it contains 40 wires.if we use 2 ide cable get about 35-40 cm radius
if somebody want to try...
Regards
Erol

[Fred]

Hi,

I finallly finished my DP.Working fine,first tests shows a coin at at least 25cm , 45 turns 0,8mm on 25cm form.

I have found pictures posted by others usefull, so here are a few ones...
regards,
Fred.

[ivconic]

Very nice!
Congratulation.
Do you have a good will to post here correct and accurate pcb draw for that version you made?
Regards!

[Esteban]

Great and very fine job! Congratulations!

Regards

Esteban

[Fred]

Hi
Thanks,

I post here the files i have used.They are not from me , they were on this forum.But i repost anyway, i think it is easier.
The PCB and files are 100% OK,except the Volume pot that works reversed.Not a big problem, and easy to correct.
I wish to thank the author of the PCB .Nice job.
Regards,
Fred.

[ApBerg]

Hello Fred.

Thanks for the foto's , now go for gold

Regards.

Ap