Delta Pulse

[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]

[erolunall]

Dear hl54

You can take true pcb from below link.

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

Regards
Erol

[hl54]

hl54

dear geo
thanks a lot for reply.

[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

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

[DIRCEU]

PCB image

HI! KT-315

I DECIDED TO BUILT THE DELTA PULSE AND I PREFER YOUR PCB DESIGN. SO THAT I NEED THE PCB WITH COMPONENTS LAYER.
IF YOU HAVE THIS PLEASE ATACH HERE.


MANY TANKS

DIRCEU.

[Geo]

Hi dear aft_72005
thanks for replay.


Hi dear geo
you said :
17 turns with wire 1mm is OK
can i 2*50 cm instead 1*1m? if yes , turns = ? wire = ?
already you said too :
26 turns awg 0.5mm DIM=75 (60*60)
can i 2*38 cm instead 1*75cm? if yes , turns = ? wire = ?
have good day and night.

Hi hl54. Sorry for late reply.
What are you mean 2*50 or 2*38?????
explain me.
You must know that Delta Pulse needs a coil of 1000uH inductance
Regards

[hl54]

hl54

Hi dear aft_72005
thanks for replay.


Hi dear geo
you said :
17 turns with wire 1mm is OK
can i 2*50 cm instead 1*1m? if yes , turns = ? wire = ?
already you said too :
26 turns awg 0.5mm DIM=75 (60*60)
can i 2*38 cm instead 1*75cm? if yes , turns = ? wire = ?
have good day and night.

[aft_72005]

The network which be able changing transmitter frequency contain R1=680K,
PR1=200K, C1=15NF around 556 ic.

[aft_72005]

Hi Hl54
You can see two various drawing Schematic diagram for delta pulse at this thread.
One from micron electronic and another drew by good friend Vladimir in proteus area
These two are ok and without error.
About pcb , I don’t build tow layer but single layer is ok . I change some section of
Singel layer pcb that you saw the version of it in this thread .
And my result with 40 cm diameter coil in air, can be detect soldring grease box with
6.5cm dia between 70-90cm.

[hl54]

help help help help help help help

Hi all
i think shema metal detector without file's protel maybe build that is wrong.because....?
i duilded 3 delta pulse two sides
2 delta pulse one side
1 xr71
but all those does not work very well.
i think that this is article had prejudicial if does not had files (protel 99 or dxp ) because for change any piece should adjure until anybody answer
if this site name is the geoteach then was help without discriminate.
***************
please anybody knows which resistors are for increase(multiplier) frequency ,and wite max increase or max decrease resistors.
thanks for replay

[hl54]

is this the teach

Hi all
i think shema metal detector without file's protel maybe build that is wrong.because....?
i duilded 3 delta pulse two sides
2 delta pulse one side
1 xr71
but all those does not work very well.
i think that this is article had prejudicial if does not had files (protel 99 or dxp ) because for change any piece should adjure until anybody answer
if this site name is the geoteach then was help without discriminate.
***************
please anybody knows which resistors are for increase(multiplier) frequency ,and wite max increase or decrease resistors.
thank for replay

[hl54]

hl54

Hi all
i want to build the coil with wire 0.9mm too because i have very much this wire.
any body know how much turn with AWG 19 (0.9mm)
1*1m = turns = delta pulse one side= ? delta pulse two sode= ?
1m = turns = delta pulse one side= ? delta pulse two sode= ?
75cm = turns = delta pulse one side= ? delta pulse two sode= ?
1*1m = turns = xr71 =?
1m = turns = xr71 =?
75cm = turns = xr71 =?
please tells me.

thank

help for build coil.

Hi all
is it Inductance Calculator Coil 1.1*1.1 (D=140cm) turn 17,AWG 19( 0.9MM)=770UH?
can i use this coil ?
it is not here article about problems and method repair (like hammerhead.)
all have a nice day.

help for build coil.

Hi all
can i build the coil 2(30*30) instead 1(60*60)?
what wire... and turn ...?
thanks