Delta Pulse - Take 2

[kt315]

refund for what? show your board pics.
interesting note to compare high end amplifier with DP. i meet it first time here.
ceramics possibly have small piezo effect, that i know but not sure. in reality i am not able to check this. let Carl and George to answer you, they are profis.
anyway, you just touch general electronics basic... no relation to DP circuit.

[Carl-NC]

Infamy, the folks on Geotech range from professional engineers to neophytes who can't even recite Ohm's Law but want to build a detector because they can't buy one, and have no oscope when things go wrong. Despite KT's sometimes biting tone, we generally do our best to help. For the neophytes I would suggest only building a project that has clear instructions, and always in stages testing each stage.

From posts 245 & 246 I can't figure out what your questions are. Maybe back up and let's deal with them one at a time. I can answer the ceramic cap question: "It depends." Often ceramic caps are just fine, I use them all the time. They can exhibit microphonics but whether that matters depends on where they are used and what performance level they potentially impact. In many detector circuits they won't matter at all. No idea on the DP because I've never built it. But what you can do is build it with ceramics, measure the performance, and then replace suspect caps with film versions and see what happens.

[kt315]

op amp op-amp opamp and comparator LM339 LM393 tester
https://www.youtube.com/watch?v=-N5b8-TjuYk

2a) Is this for sale with instructions?
2b) Do you have any other testing kit for sale?

i do some things for geotechers but they ignore me.
whole batch was sold at ebay but you can copy design. also chineses are selling the tester for not so expensive price.
I did also LC coil tester, for VLF detectors, no interest of geotechers.

how to check NE555 out of board... i recommended to buy simplest kit from ali, they are much there.
also, i did open big thread for all chinese kits, in the forum. transistor tester will later. you can check IRF740, diodes, electrolitics ESR etc.

[kt315]

[dbanner]

Neophyte

1. a person who is new to a subject or activity.
"four-day cooking classes are offered to neophytes and experts"

[kt315]

5) LM556 gives more detail than NE556 is that correct? I ask because I analyse the signals after survey, in post processing.

same chip, different manufacturers. no differences.

[algan]

Does anyone have an SMD version of Delta Pulse in Lay format? Thanks

[kt315]

star_schina did. Новый вариант печатной платы DP - Просмотр темы • Схемы металлоискателей MD4U •


Всем привет.
Решил собрать DP. Где купить готовую печатную плату не нащел, да и, поскольку работаю в области электроники, испытываю некое отвращение к штыревым компонентам еще с начала 20-х годов.
Замыслил сделать свой вариант платы. Первое, у меня нет возможности сверлить отверстия от слова вообще, тоесть печатная плата должна быть односторонней. С перемычками, разумеется. Сделал разводку, протравил, спаял, не работает. Вероятнее всего, не проявил усердия, да и давно не занимался ЛУТ. Видимо, гдето был коротыш неземетный или даже коротыши. Промучался, не получилось. Кстати, вариант платы есть, если кто-то хочет попробовать сделать печатную плату на одной стороне под SMD компоненты, могу дать файлы.
Затем, сделал второй вариант платы, уже двусторонняя под SMD для заказа на производстве. Плата размером 10 на 10 см. Изготовили в Китае. Спаял, снова не работает. В контрольных точках TR3, TR3, TR4 и TR5 импульсы как на картинке. Тоже самое при подключенной катушке. Но вот далее я не могу двинуться. Сигнал после усилителя на U5 через аналоговые ключи объединяется на резисторах R25 и R26. И что дальше, какой он формы или уровня? Хоть я и работаю в области электронике, но не силен в аналоговой , видимо, там далее есть нюанс. Как проверить работоспособность?
Моя схема практически не отличается от "классической", добавил только несколько дополнительных фильтрующих элементов, да аналоговые ключи перетусовал немного для оптимизации разводки. Резисторы, что "рекомендуют" в паре сделать точными, у меня точностью по 0,1%, ьхотя на схеме значаться как 5%. Дело явно не в них. И сдвоенный таймер на генерацию импульса разделил на 2, поскольку в звуковом гереаторе используется одиночный таймер. Это что бы номенклатуру сократить.
Может быть, найдутся гуру, посмотрят схему.
Схему, трехмерку платы, осциллограммы прикрепляю.

Hello everyone. I decided to build a DP. I couldn't find a place to buy a ready-made PCB, and since I work in electronics, I've had a certain aversion to pin-type components since the early 20s. I decided to make my own version of the board. First, I can't drill any holes, so the PCB has to be single-sided. With jumpers, of course. I did the routing, etched it, soldered it, and it didn't work. I probably wasn't diligent enough, and I haven't done any LUT work in a while. Apparently, there was a short somewhere, or even shorts. I struggled, but it didn't work. By the way, I have a version of the board; if anyone wants to try making a single-sided PCB for SMD components, I can provide the files. Then, I made a second version of the board, this time double-sided for SMD components, to order from a manufacturer. The board is 10 x 10 cm. It was made in China. I soldered it, and it still doesn't work. At test points TR3, TR3, TR4, and TR5, the pulses are as shown in the picture. The same thing happens with the coil connected. But I can't get any further. The signal after the amplifier on U5 is combined through analog switches on resistors R25 and R26. So what happens next? What shape or level is it? Even though I work in electronics, I'm not an expert in analog, so there must be a nuance there. How can I check if it's working? My circuit is practically identical to the "classic" one. I only added a few additional filter elements and slightly reshuffled the analog switches to optimize the layout. The resistors that are "recommended" to be precise in pairs are accurate to 0.1%, although they are listed as 5% in the schematic. That's clearly not the issue. I also divided the dual timer for pulse generation by two, since the audio generator uses a single timer. This was done to reduce the number of components. Maybe some gurus will look at the circuit. I'm attaching the schematic, 3D view of the board, and oscillograms.

[GeoMax]

Does anyone have an SMD version of Delta Pulse in Lay format? Thanks

Why not make your own Delta Pulse SMD circuit board? It's not really difficult to make one. You create your own SMD design based on your needs and send it to China for manufacturing.

[algan]

yes, but it would be easier for me to look at and correct a ready-made smd, since it is not on the geotech forum, I will also look for it on https://www.teknolojiekibi.com/yeni/

[GeoMax]

yes, but it would be easier for me to look at and correct a ready-made smd, since it is not on the geotech forum, I will also look for it on https://www.teknolojiekibi.com/yeni/

Hi Algan,

you can buy a ready made Delta Pulse here already... saves time and effort.

Pulse 3S - Technology Team

[algan]

Hi Algan,

you can buy a ready made Delta Pulse here already... saves time and effort.

Pulse 3S - Technology Team

I went there 15 years ago in Istanbul, I made an appointment for a day and time, and the owner didn't meet me on purpose, supposedly he had a lot of work away from his office, I wanted to wait for him, but he said another employee would serve you, don't wait for me, back then the offices were some kind of garages under the block, now, I don't know, I wanted tests, and then I bought a Delta Pulse 3, it was new and they lied to me, it didn't work on the ground, only in the air, and I wouldn't buy anything else from him. Thanks.

[GeoMax]

I went there 15 years ago in Istanbul, I made an appointment for a day and time, and the owner didn't meet me on purpose, supposedly he had a lot of work away from his office, I wanted to wait for him, but he said another employee would serve you, don't wait for me, back then the offices were some kind of garages under the block, now, I don't know, I wanted tests, and then I bought a Delta Pulse 3, it was new and they lied to me, it didn't work on the ground, only in the air, and I wouldn't buy anything else from him. Thanks.

Hi Algan,

thanks for your report.

[kt315]

https://www.youtube.com/shorts/U__oZwnHlKw

[basellafe]

Hello kt315, I have a question regarding the difference between the Felezjoo and the DP. Both are excellent devices, but I see that each has its own characteristics. The Felezjoo has iron insulation and loses stability, while the DP is the opposite. I'd appreciate your opinion on which one to take with you if you were going out to inspect a site.