Delta Pulse

Thanks

Dear Max and Geo
Thanks for ur guide.i will try it.
goodluck

[Geo]

Hi. Delta Pulse (100Hz) need a 1mH coil, so for any dimension you need make the right calculate. If you will make a 1x1m coil then it is better to use at least 1mm dianeter wire. At 60x60 0.5mm wire will be OK.
Don't forget to play with dumper resistor.

[Max]

Dear Friends(Geo,Ivconic,Max,...)
Thank u very much for ur helps on this forum.I made a DP,but I have some questions.pls
guide me:
1-For square coils(40*40,60*60 and 100*100cm),what is exact number of round and wire
diameter for each one?(I am searching for medium size objects over 4 ft depth)and must
coils had sheild and enamel?
2-How can i connect microAmper meter and headphone to DP togather?
can i connect to SPK point?
thanks again and goodluck

Hi,
1. all about inductance you need, your damping resistor and things like that: cause coil are large you need fewer turns than with e.g. 8'' round; you can use a coil calculator or hand made calculations or just experiment with less turns of than with smaller coils

Example: suppose you need a 300uH coil... and 1m*1m shape... 1m^2 is what you get from an e.g. round coil of 55cm diameter... so you can use inductance formula for round air core coil to get turns:

I've made and result for 0.3mm diameter wire is 16 turns for 300uH for 1m*1m... but then you have always make tests by your own to be sure coil is ok for your setup (e.g. using scope to see how good is damped etc etc)

You have also to consider resistance about the maximum current required at each TX pulse... and limit if needed by a small value resistor of few ohms 2W.

About shielding ... if you use larger coils you can suspend them far away soil e.g. 20cm and more... so you can also omit shield cause soil influence will be low at that distances.

About enamel depends if you use enamelled wire or plastic pvc covered wire... that you can use in larger coils... in any case each turn need to be insulated from the others.

2. uhm... well you can take a look at XR-71 about meter... XR-71 and DeltaPulse share most of the circuit... that's about the same so you can mod tailoring stuff for your needs; for headphone you can connect a socket to speaker wires and use a resistor to match better inductance of headphones (sometimes for hi-quality HP the inductance is around 150ohm... for common stuff you can use a 27-33ohm resistor there... that will give you a good volume without overload "normal" HP speakers).

Kind regards,
Max

Help me pls

Dear Friends(Geo,Ivconic,Max,...)
Thank u very much for ur helps on this forum.I made a DP,but I have some questions.pls
guide me:
1-For square coils(40*40,60*60 and 100*100cm),what is exact number of round and wire
diameter for each one?(I am searching for medium size objects over 4 ft depth)and must
coils had sheild and enamel?
2-How can i connect microAmper meter and headphone to DP togather?
can i connect to SPK point?
thanks again and goodluck

[Uykusuz]

Hi

You can reach single layer PCB of delta pulse from this link:

http://www.teknolojiekibi.com/yeni/index.php?topic=4.msg6#msg6

[nelson]

You are right Geo. My pcb is a one side with lots of jumpers on it to configure the original board, but it must be some errors on connectios, cause the detector is not working stable, so i have to recheck the board again.
Thanks and regards

Nelson

Hi Nelson .
1. I never saw a one side pcb for DeltaPulse.
2. DeltaPulse is not good for gold nuggets
3.You must use a detector with delay <15us maybe <10us. So Hammerhead (i think that you can order the pcb from Carl) or Goldscan4 (problem with pcb) are suitable for you
Regards

[Geo]

Hi Nelson .
1. I never saw a one side pcb for DeltaPulse.
2. DeltaPulse is not good for gold nuggets
3.You must use a detector with delay <15us maybe <10us. So Hammerhead (i think that you can order the pcb from Carl) or Goldscan4 (problem with pcb) are suitable for you
Regards

[nelson]

Hi 1843.
I had made delta pulse, but with one side pcb, so i want to finish it first.
Anyway, i have almost all componets to build Gary pulse induction MD. I have heard that this is a good detector too.
I also have made two clone pi MD with success, bust has all my detectors i know i fail with coils. Alls are working good, but i recognize that they can go deeper if i try to build good coils.
Have you made Gary PI?
If so, how was your expirence with it?
I m looking for a good machine to get gold nuggets with it.
My Tesoro Golden Sabre is working good by now, so after i finish a few coils, i ll try to build one to detect gold nuggets. But first i need to get more expirence with coils constructios, before i get into gold nuggets.
I also have heard that Gary PI MD can get nuggets at about 2 inches.
Regards

Nelson

Hi Nelson,

Why do you don't make Gary's PI??? It is so stable!!!

Delta Pulse is not an easy project and not recommend for beginners.

Regards

[1843]

Hi, i was thinking on rebuild my Delta Pulse, but with one side pcb, so if anyone know if there are any one side pcb, let me know. This cause i can{t find doble side pcb here, my actual DP was build on a one side pcb with jumpers, so i ll have to check it again, cause DP is not working.

Regards
Nelson

Hi Nelson,

Why do you don't make Gary's PI??? It is so stable!!!

Delta Pulse is not an easy project and not recommend for beginners.

Regards

[nelson]

Hi, i was thinking on rebuild my Delta Pulse, but with one side pcb, so if anyone know if there are any one side pcb, let me know. This cause i can{t find doble side pcb here, my actual DP was build on a one side pcb with jumpers, so i ll have to check it again, cause DP is not working.

Regards
Nelson

my little deltapulse project

[Geo]

Geo i had 1266. still have it one of my friend from "company". Yes it is very good detector for coins mostly....but i managed that my TGS is much,much better now from 1266....That's why i suggest you to make TGS not 1266.
In TGS design you dont have any "critical" component, in 1266 you have transformer,quartz and funny pcb's....
But as you wish, i wish you success anyway...Keep me imformed about progress.
Regards!

Hi Ivica . About "1266 critical components" you have right, but 1266 is more sensitive with standart coils. BUT you know me..... i like only to construct detectors...... not to go for theature finding. So ........
Regards

Ohhh i forgot Max. Hi Max . Yes i like GS4. Maybe is the best PI detector for small objects so i will try to construct it. I an not afraid........ i will make it ot work perfect for me. I will try to design 2 or 3 pcbs for it and so to be more easy to work without selfoscillations or ....... . All the GS4 in one pcb is more difficult and critical ....... , especially for me and for hobby .
Anyway my regards

[Geo]

Hi Geo,
If you want make DP sensitive to small objects, change C21 with a 4.7uF or so.
Regards

Hi 1843. I will try it but another way is to put a potentiometer and a switch as it is the XR71p (for critical manual tune). But why not to try your "capacitor solution".
Regards

[Max]

Hi All .
First for Max. I work my DP at 100 to 400Hz. 400Hz is better because it has better response (at 100 hz i must move slowly the coil if the signal is low otherway i lose the object). The clocking is the same at 100 or 400 Hz. Yesterday i changed the first delay from 30us to 12us. Results....... very bad depth..... why????? i had not time to check it with oscilloscope. I believe that the problem is the coil (maybe it can't go to low). I want to minimise the max delays time so to can increase the freq to 800.... 1000 Hz for small objects detecting.
Now to Ivica.
How and Where are you. I have long time to write you. Of course i am very busy this time and i didn't made a tesoro GS . What about 1266 ?
Now for DP. What are you mean reject? is the first delay Tr4 or the second delay Tr5. If it is the 1st delay then yes if we play with it we can reject some objects. At my detector i have the best results with the potentiometer about short 30....40us. The sensitivity is about the same, max 30cm for 2 euro or 1/2 euro with coil 25 cm 1000uH. With lower inductance i have a little better results but it needs lower dumper (1k/1W now i have 2k2, 1/4w) and is not so stable.
I forgot .... with delay to 80us you can reject the ceramics.
When i will finish the works (maybe on October) i program to construct Barracuda..... 1266 ........ and GS4. IT IS OK TO SPENT MY TIME ON WINTER.
Best Regards

Hi Geo,
if decreasing delay you lose performance you have maybe an overshot due to coil shield. Happened to me. Solved making coil as BBsailor described.

About PI to make I suggest GS4 too. It's a beast, belive me... but also on consumption side... anyway it's a very good PI and good to find small things at depth with just a 8'' coil. But be aware of bricks ! It's a nightmare when bricks are there... cannot use it.

I swear that Alexis' schematic is OK in everything now. There were few errors related to 2 fets connections, and other small things that were no good. But I've built and works perfectly and mods. are in last posted stuff. Find it.
Also I've made a thread where posted about progresses in tuning etc.

Unfortunately, I haven't a real PCB for it, cause decided to make in separate modules (proto boards) then connecting them. At the end I had incredible size for main unit... something like 30x20x8 cm black-box. There are lot of tricks and traps in GS4... expecially tuning is not easy and require much luck. It's incredible machine for beach hunting! If you get it work...

Best regards,
Max

[ivconic]

..

"I believe that a 1266 is a very good and easy detectorwith better sens and discrimination than Tesoro"

Geo i had 1266. still have it one of my friend from "company". Yes it is very good detector for coins mostly....but i managed that my TGS is much,much better now from 1266....That's why i suggest you to make TGS not 1266.
In TGS design you dont have any "critical" component, in 1266 you have transformer,quartz and funny pcb's....
But as you wish, i wish you success anyway...Keep me imformed about progress.
Regards!

[1843]

Hi Geo,
If you want make DP sensitive to small objects, change C21 with a 4.7uF or so.
Regards