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Offline legendario
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« Reply #10 on: June 02, 2012, 05:21:48 pm »
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Hello Supermen Let me make some comments. I do not know secrets of delta pulse. Some say that remarkable improvements obtained in the yield of PI, increasing the TX power and using low noise integrated in the front, as well as metal film resistors in the buffer. I use common elements that get in my country, LF357, TL072, IRF840 etc. The above amendments will allow the use of lower inductance coils, with this current increases, giving more power to the coil as I mentioned before. I started this project more than three years and at first was very unstable. Gradually make the changes indicated, achieving better performance. I spend the same with other projects, at first did not work and you have to devote much time to get it ready. Each case is different. The variations are many and depend on that use of the detector. For example the diode between the IRF840 and coil, it is good for detecting small objects obtained by a more rapid response, in this case the damping resistance is around 750 ohm. If you want to detect larger objects a little deeper, this diode is not necessary, buffer and R is less than 500 ohm. We must prove in each case the performance buried objects. Sometimes a good performance in the air is bad in the field. I am a novice at this, but if I can help with anything, I will gladly try to answer. regards

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Offline tantalTopic starter
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« Reply #11 on: June 02, 2012, 07:02:20 pm »
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I bought Delta pulse of teknolojiekibi.com, but the results were disappointing. Replace LM356N LM357N but the latter case the detectors osilira. I can understand why.?? Idea

Here's a inforacija for components.Dooley, I thought you were right, but I had to look that up. According to dataIntersil sheet, CD4098 uses a different time delay formula (t = 0.5RxCx, versus t = RxCx for CD4538). But that means we can double or Rx or Cxvalue, then everything should be fine. (Double Cx and then use the same potentiometers as before.) There are several other '4538 'devices out there (such as MC14538, CD14538, HEF4538, HCF4538.) These other devices have some minimum limit of either Rx or Cx value, or both. Some of them will work, and some will not. For example HCF4538has a minimum value of Rx 4k?, with Cx minimum 5nF. (Ouch. I would like to know that before you buy 20 of them.) Do not try to use it here. HEF4538 has a minimum value of Cx 2nF and also so should not be used. I believe that the MC14538 and CD14538 are alright to use. Because they no minimum limit of Cx and their limiting RX is high enough that they stillcan be used to DP My information may be wrong - I'm not setting to beauthoritative source, it is the manufacturer data sheets are for. My point is, everyone wants to replace one of the other parts would be wise to carefully apply the data sheet before. Do not take anything.
This is about thinking   Idea



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« Reply #12 on: June 02, 2012, 08:07:14 pm »
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Sorry, some sentences do not quite understand, try to answer: I have two delta pulse at the moment. In a DP, I use 2 integrated "MC14358BCP". The brand does not know, it looks Chinese. In another use 1 integrated DP "HCF4538BE" brand ST, 1 integrated "HEF 4538BP" Mark Philips. In both detectors are capacitors of 1 nF. As the diagram in red. No problems with the times, these integrated; In another project GS4, I'm using 4 integrated "CD 14538BE", here the minimum is 1.5 nF and resistance in one of them is below 10 K. A pulse should be 15 or 16 usec., According to the forum, is 20 usec., But resolved by further reducing the resistance. Once you try changing the LF356 LF357 the other did not work well. I use only LF357. If I had a DP of teknolojiekibi.com, we first verify are: Coil. The damping resistance. The value of R6, (sorry if I am repetitive). After achieving stable operation, then try the other changes.


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« Reply #13 on: June 03, 2012, 08:37:14 am »
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-legendario   I greet you on your response.

- supermen After more than your made projects will be experience help you .

- legendario & supermen I am amused by talking.

-Important  : The secret of the success of each project is to follow the original design because the only one who knows is the only designer.

-Must take care of well by the battery   and coil specification.

-Must take into account the different specifications and made good components , PCB good.

-I am interested in the work of the projects and its success on the work bench only.

- I hope To  two as reach the best results.

best time

j.

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« Reply #14 on: June 03, 2012, 01:00:29 pm »
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Japanese, thanks for your advice and follow with interest this topic. regards

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« Reply #15 on: June 10, 2018, 04:37:46 am »
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Hi japanese
I read most pages about Delta Pulse. Only in the part where a friend put up and I could have a schematic circuit ....
Now I want to build xr71 project.
Please give me all the information up-to-date on the circuit.
thank you


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« Reply #16 on: June 10, 2018, 06:48:52 am »
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you see differency between DP schematic and SNIFFER XR71 schematic? i am not. thats one schematic of TWO BULGARIANS in realization.
you can recall snifo like you want. for example good name is MARAUDER-2. i present it to you.


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« Reply #17 on: June 10, 2018, 12:50:12 pm »
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Hello NE555
My problem is that some designs will not open to me.
Meanwhile, in each corner and at the side of my friends, they have put it in a way that I do not know which one is up to date and which one is not. If you want to get pcb and list of components for the start of the project.
Excuse the use of Google Trans.
Thankful

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« Reply #18 on: June 10, 2018, 05:28:59 pm »
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i am ready to xchange a board with you for some amount of money.

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« Last Edit: June 10, 2018, 05:29:22 pm by NE555 »
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« Reply #19 on: June 10, 2018, 06:08:30 pm »
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Hi, I live in a place where I did not get such a thing, and at the same time I just asked what I said above.
Thank you

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