Delta pulse sniffer xr71 Problem

[Chamath]

I came across an important informational paper that was presented many years ago where he explained in great detail that he had built this device. He had attached many photographs. Remember that he is not a original owner of the device.

He has said that he changed some values and later found a 6 cm gold ring about 50 cm high from a coil with a 19 cm.
I also found a video of him with more details,

He says in that article that he is someone on this website and that he got the advice from kt315. However, I could clearly see from his video that gold is being found as he says.

I also changed those values and checked. But the results are not successful. This is a big problem for me.He had clearly stated that the small search coil was made with 31 turns of 0.5mm coil wire.

But he had said that he had made two pieces of coil wire by soldering them together. It was mentioned that he did this because he did not have a complete coil of wire

[GeoMax]

Hi Chamath,

why do you not share the article here.

[kt315]

make an album in the forum and put photos of your board. so everybody could see and maybe could seek your problem.
i solder a board... and i check every component, EVERY.

[Chamath]

Hi Chamath,

why do you not share the article here.

I will submit the same article

[Chamath]

I have attached the article below. Read kt315 carefully. What could be the reason why his device works as he says and the device I designed does not?

Is there really something hidden here?

" Note that the image of the device above is of the one I created "

[Chamath]

make an album in the forum and put photos of your board. so everybody could see and maybe could seek your problem.
i solder a board... and i check every component, EVERY.

Of course I will take pictures of everything and post it here as you say. I think it will be very important to you and other members of this forum.

I have noticed that there have been many problems with this equipment over the years.

I have yet to see a single device here that has been properly made to fix the problems here. I feel that no one is giving correct information. Maybe I could be wrong. This is just my personal opinion.

Thank You Mr.kt315

[kt315]

I have noticed that there have been many problems with this equipment over the years.

it is just your private problem. Delta has high sensitivity and great depth, no one detector has.

[Chamath]

I have noticed that there have been many problems with this equipment over the years.

it is just your private problem. Delta has high sensitivity and great depth, no one detector has.

Yes, I know this is a great device. I fixed everything on the PCB without fail, but still can't figure out what the problem is.

I made a 60cm search coil. Took a 0.5mm copper wire. 25 turns

Here the inductance is around 1343 uh. I think that inductance value has become a problem

Dear Mr kt315, I am looking for your help to correct this

[GeoMax]

Hi Chamath,

in 2005/6 I made the Delta Pulse based on the Delta Pulse schematic. I followed very closely the diagram and the circuit worked fine at the first time. There was no error in it. Of course I made my own PCB.
I did not used one of the "ready made" PCB's which were floating around the Internet.

Here is the circuit of the Delta Pulse I used for my PCB.

[Chamath]

Hi Chamath,

in 2005/6 I made the Delta Pulse based on the Delta Pulse schematic. I followed very closely the diagram and the circuit worked fine at the first time. There was no error in it. Of course I made my own PCB.
I did not used one of the "ready made" PCB's which were floating around the Internet.

Here is the circuit of the Delta Pulse I used for my PCB.

I looked at this before and I saw that it works well in many places. My device is working but the problem is with searching depth.

Could a change in search coil affect this? What should be the value of the inductance of the search coil suitable for this?

The image below is the device I made

[kt315]

really the pots are:

- PULSE WIDTH. TX power. in old sch it is NOISE.
- FIRST DELAY. cut off nails. in old sch it is SIGNAL.
- SECOND DELAY. tune on your ground condition. in old sch it is SENS.
left are clear for you, i hope.

[GeoMax]

Hi,

I think the inductance is much to high. Should be anything between 300 and 400uH. See below coil table.

[GeoMax]

If you look at the table, you see at a 50cm coil diameter a suggested # of windings of 15 only. At a coil diameter of 60cm it schould be somewhere around 12..14 windings only.

[Chamath]

Hi,

I think the inductance is much to high. Should be anything between 300 and 400uH. See below coil table.

I have had this information for a long time.. This is a data record that can only be used for the clone pi metal detector type, right? I have used it before.. works well with those devices.

[Chamath]

really the pots are:

- PULSE WIDTH. TX power. in old sch it is NOISE.
- FIRST DELAY. cut off nails. in old sch it is SIGNAL.
- SECOND DELAY. tune on your ground condition. in old sch it is SENS.
left are clear for you, i hope.

Sorry. I'm not really clear. Am I wrong in the diagram? I don't know exactly about it. I chose those places because they were pointed out elsewhere

Can you please give me the locations in order?

Thank You