Delta Pulse

[kt315]

a concept with the resistors i took from DEEPERS 10DD. same resistors to front (metalic) panel and to rear one, same values.
there are two way:
1. you use plactic box. you have to use graphite varnish layer at inner side under the PCB, rear panel and front panel - also will good.
2. you use plastic box but panels front and rear are metalic. it was DEEPERS 10DD. there was just cooper plate under PCB connected by wire to the resistor.

also two cases:
1. you use potenciometers in plastic enclosure. in 1 you have to use graphite cover at front inner side. in 2 nothing.
2. you use pots in metalic enclosure. people connected naked wire the pots one to another, soldered, and the wire's end goes to R59 - best way (in any hole of PCB to the resistor).

in 1 a point of connection of graphite layer to Ground is the cable's socket (it is metallic) touched to the layer. so you have to connect the socket housing to Ground using single naked wire.

[kt315]

variant with the foil. cooper side is addressed to enclosure bottom, not to the PCB.

[GeoMax]

Hello Kt315,

does it really make a noticeable difference if I shield the housing or not? Do you actually need shielding at all if you're not looking under high-voltage lines? Or is it not the case that the electronics and the housing should have the same electrostatic potential?

[kt315]

Hello Kt315,

does it really make a noticeable difference if I shield the housing or not? Do you actually need shielding at all if you're not looking under high-voltage lines? Or is it not the case that the electronics and the housing should have the same electrostatic potential?

hi Geo,

I always see misunderstanding of people what is Electrostatic Field. If you will understand the Nature oneday you will never ask me and will do the static protection without mine suggestions.
you will sure make it right on whole your life left.
that is like 'you can supply constantly a men by fish, or to teach him to fish himself'. same case.
Just imagine you/your body is in water environment. water everywhere, water around you. and you can NOT be free of the water and going from.
That is Electrostatic Field, in reality. It is that around you CONSTANTLY. But there is one important condition - if you/your body/your hand/your foot does not move then EF is not showing itself never. BUT JUST MOVE - AND YOU GET EF CHARGING in 10+ kiloVolts potential.

anotherway, present all like a circuit - hands, foots, body, the ground, the air and a detector in your hand, connected in one circuit. present where EF charge will go on and will discharge off.
present a capacitor - how it is working. oops! he is working EF principle using.
present a ligthning in the sky discharging in the ground - same principle, same Nature. no another Nature. so the ground has one potential, the sky has another one. like as two layers of a capacitor. a capacitor is charging up and discharging off passing alternating current in a circuit.

answer is - Electrons are everywhere and you are just seeking a way to protect your coil and enclosure from the influence.

Or is it not the case that the electronics and the housing should have the same electrostatic potential?

it is not an agenda to have the same electrostatic potential. you have to GIVE THE WAY for discharge it COULD GO FREE OUT.
if no, you will hear those cracks and spikes in the detector's speaker that are doing you nerve.

The Wimshurst Machine

MIT Physics Demo -- The Wimshurst Machine - YouTube

Электрофорная машина - YouTube

[GeoMax]

Hi KT315,

thanks for the explanation... I know what an electrostatic field is and what effect it can have on an electronic circuit. But that wasn't really my question. The actual question/statement was the last few sentences. "...the electronics and the enclosure (case) should have the same electrostatic potential..." That's why many electronic circuits like audio amplifiers have a "chassis ground" connection to the enclosure (case). If not, you would notice electrostatic interference when you touch the enclosure (case). In my detector circuit, I connect all my electronic circuits to a shielded enclosure (case) using a chassis ground connection.

I think, I have seen similar chassis ground connections (electronic and front-/rear panel) in the Deepers 10 DD schematic or if you look at some Eric Foster detector PCB images you can also see a kind of chassis ground connection to the enclosure as well.

[kt315]

transfer

I bought CD4538 ICs for a Delta Pulse I was building, the pulse times were less than 50% of normal values. I think they are fake, or they have different characteristics to the ones I used before, I don't know.

Emersonpaz I had the same problem with this CD4538BE on the Delta Pulse it was showing 22us where it should be 45us according to the original project, I compensated by changing the 1n5 capacitor to 4n7 sampling at 41us, yes the internal calculation differs from the datasheet.

[kt315]

Gospodine.
Kupio sam jednu PCB i jedan deo mi nije jasan.Šta znače tačke T!, T2, T3 i .... ostale T.....Gde se one vezuju.Dali imate primer kako to izgleda.Ja bi onda poručio još jednu PCB ploču.U koje otvore ulaze pinovi potenciometra.Hvala.

Izvinite.Dali ima TANTAL kondezatorl


hello Amigo

T1, T2 и т.д. это TEST POINTs. то есть точки в которых проверяем сигналы - в том случае когда плата не запустилась сразу. ничего не нужно соединять. в эти отверстия можно впаять штыри, можно ничего не впаивать.эти точки отмечены на схеме и ПОДПИСАНЫ. РАССМОТРИТЕ СХЕМУ ВНИМАТЕЛЬНО.

примеры уже готовой платы вы найдете в архиве.потенциометры запаиватся либо в плату либо если потенциометры ставятся отдельно то проводами. найдете примеры в архиве.тантал кондесаторы вы можете взять с любых плат, в частности с компьютерных. мы называем это TRASH TECHNOLOGY. использование деталей с убитых выкинутых плат. либо, если у вас трудности найти SMD тантал ТО НЕ СТАВЬТЕ НА ИХ МЕСТО НИЧЕГО. плата будет работать БЕЗ НИХ.

скачать весь архив по ссылке https://drive.google.com/file/d/1E2g...e_linkpleasure

Anatloy


T1, T2, etc. are TEST POINTS. That is, the points at which we check the signals - in the case when the board does not start up immediately. Nothing needs to be connected. You can solder pins into these holes, or you can leave anything unsoldered. These points are marked on the diagram and SIGNED. REVIEW THE DIAGRAM CAREFULLY.

You will find examples of a finished board in the archive. Potentiometers are soldered either into the board or, if the potentiometers are installed separately, then with wires. You will find examples in the archive. You can take tantalum capacitors from any boards, in particular from computer ones. We call this TRASH TECHNOLOGY. Using parts from dead discarded boards. Or, if you have difficulty finding SMD tantalum, DO NOT PUT ANYTHING IN THEIR PLACE. The board will work WITHOUT THEM.

Download the entire archive from the link https://drive.google.com/file/d/1E2g...e_linkpleasure

[kt315]

Pozdrav gospodine.Ja želim da kupim još jedan PCB.Prvi ja kupio ali neznam koji tantalium da stavim.Dali od 16v,68mf ili 25v ili 35v 68mf.Javite mi.Molim vas.Ja kupim još jednu PCB.Hvala.

Hello sir. I want to buy another PCB. I bought the first one but I don't know which tantalum to put. Is it 16v,68mf or 25v or 35v 68mf. Let me know. Please. I will buy another PCB. Thank you.

All tantalums on the board are SMD - SURFACE MOUNTED DEVICES. Or, SMT - SURFACE MOUNTED TECHNOLOGY.
Not ordinary throw-holes components. They are set just at bottom side of the board.
Main rule in electronics is to use capacitors with more voltage than you see in a circuit. Is it clear for your understanding?
If you see 12V in the circuit between some points (power supply lines, for example) you take 12+V cap - ie 16V. That is also meaning you CAN take caps 25V and more.
If you set 10V cap in circuit 12V you will get a smoke.

However you sure will see that caps with 25V and more has MORE SIZES itself, while size placement on the board is strictly limited and you CAN NOT solder 68uF x 35V cap in the board.
You have to take the tantalums sizes' tables from the Internet using GOOGLE and learn them, or to seek especially made topic related the tantalums in forum GEOTECH1, for beginners in the electronics.
Also, learn PART LIST more attentionally.

[kt315]

• Good morning friend, I'm Marcial from Spain, I bought a DeltaPulse pcb from you, I have already finished it, I have had some problems finding components. (All the ones I use are very good quality, 1% resistance, WIMA capacitors, and the best I can get) but there are integrated ones that I have not been able to find in TAYDA or TME, and I don't know if they are good or not. cheap copies.
  
  When I turn on the detector it makes a constant sound and I can't regulate anything else. Is this due to the integrated 4538?
  
  I haven't measured pulses or anything because I finished yesterday afternoon. I start the first time and usually check twice before soldering. I think it's because of the integrated one I put in.
  Has this happened? Or do I need to verify something else?
  
  
  here you put
  DD1 4538 HEF4538BP, 74HC4538N, MC14538BCP do not use CD4538 (RCA)
  
  They sent me a CD74hc4538
  Alright? Or is this what the instructions refer to? Not to use.
  
  I saw in a photo of their PCB that they used MC14538BCP.
  
  Can you tell me if that chip is okay so I don't spend more money or do I have to check something else?
  Isn't a coil necessary for the detector to work well?
  
  I really appreciate your help.
  

[Malospelos]

Good morning, yesterday I made DeltaPulse work successfully, I am testing a commercial 18" Minelab Gpx Concentric coil, in principle it works, then I will do pulse measurements. (It has just been finished).

What doesn't work for me is the microammeter, I know it is regulated with R37 (560ohm), I bought a 50u Chinese one, and it doesn't seem to work.

Is 560 ohm for a 50u ammeter? Or is it for a 100u? How could it be regulated or what does it depend on?

Thanks for your answers.


I also want to thank KT for his patience, I guess he is tired of the same questions and the PCB is very good, very happy, worth every dollar you pay.

[kt315]

good news for GEOTECH1 you got the result without my help. nice job.

R37 560 Ohm is for 100uA indicator, according to schematic. for 50uA one you have to decrease R37.
set a trimmer 0.5-1kOhm instead the resistor and turn it on getting max deviation on strong sound.

some variations of DP/SNIFF already has the trim on a board. attached.

[Malospelos]

Good morning, thank you very much, it is difficult for me, I try to read a lot and decipher things, I don't know how permissive this pcb is to be able to play with it, there are components that are difficult to find and I don't want to burn them .

That's why I ask, with other projects I have been braver and I have tried countless things and I have learned.

Thanks again

[Malospelos]

Good morning, I have been researching so as not to repeat questions, I have not found it exactly.

If I'm not mistaken, the DeltaPulse is prepared to use large coils.
The damping resistor R5 is 680 ohms, what size coil is that resistor for? I guess (1mx1m)?

I've been testing the 18" concentric GPx coil using just the external one (mono mode). It works but the depth is low for that coil.

To change the damping resistance it is necessary to vary R5 (680ohm) or I also have to remove R6 (1K). Both act as a damping resistance? or simply R5. And R6 remain in place.

Or is the PCB configured for a 300mm coil and the damping resistor is R5+R6? = 1.68

I have seen this, does it work or is it approximate?


-- GPX coil has 315mH

Thanks for your help

[Toros]

Good morning, I have been researching so as not to repeat questions, I have not found it exactly.

If I'm not mistaken, the DeltaPulse is prepared to use large coils.
The damping resistor R5 is 680 ohms, what size coil is that resistor for? I guess (1mx1m)?

I've been testing the 18" concentric GPx coil using just the external one (mono mode). It works but the depth is low for that coil.

To change the damping resistance it is necessary to vary R5 (680ohm) or I also have to remove R6 (1K). Both act as a damping resistance? or simply R5. And R6 remain in place.

Or is the PCB configured for a 300mm coil and the damping resistor is R5+R6? = 1.68

I have seen this, does it work or is it approximate?


-- GPX coil has 315mH

Thanks for your help

For each coil you connect to the device, a separate damping resistor is required. It is selected experimentally to obtain the following effect:

[kt315]

I've been testing the 18" concentric GPx coil using just the external one (mono mode). It works but the depth is low for that coil.

seems you have to decrease MAIN DELAY from minimal value 40us to 10-12. anyway you must go by standart way of PI detectors for gold nuggets just your coil is small for a deeper
DP working with coil 1 x 1 meter. and yes, then you have to change damping resistor.
read the article of Carl Moreland HAMMERHEAD on MAIN DELAY.
second way to tune SECOND DELAY to maximal possible value (on ground you will hunt), however you have to find stabile point.