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Offline tantal
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« Reply #750 on: September 08, 2012, 02:00:56 pm »
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 Hello
Reset button should function in two positions???
manual position???
automatic position???
When the jumper is automatska position then I reset to calm myself down detector.
In manual work reset does not work ..
It is ok or not???



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Offline xavier
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« Reply #751 on: September 09, 2012, 01:05:09 pm »
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Quote:Posted by tantal
What is better than UA556, TL062, 4538
4066, LF357N


UA556 ? no such chip to my knowledge but the NE556 is a dual timer
TL062 is a JFET Op-Amp
4538 what ?
4066 is a quad analog switch
LF357 is an Op-Amp




Posted on: September 09, 2012, 07:56:21 PM
Quote:Posted by satdave
using ordinary alarm cable striped


WHAT  Shocked this will never work as the wire that you are using is not insulated and will only make a short. Use 0.5mm magnet wire start with 16 turns, you should be getting better results but as I do not know what the inductance is supposed to be on that detector I cant give you much more on the coil. You could try with a 280mm coil diameter for starters.   

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So many questions so little time

Offline Homefire
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« Reply #752 on: September 09, 2012, 09:49:04 pm »
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uA556 is Fairchilds 556 timer. Cool

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« Reply #753 on: September 10, 2012, 12:40:09 am »
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This is the Turkish version 7 POTENCIOMETAR
No classic Delta Pulse2... ..!!!!  Grin

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elbombaci@gmail.com
Uykusuz tarafından düzenlenmistir

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Posted on: September 09, 2012, 11:29:09 PM
Angry
I have set a better example: BC546ABC ... BC557ABC.There's a difference in amplification A = low, B = medium, C = high.For Integrated Circuit also has importance cap and label
TL062, TL072, TL082, CD4538BE CD4066BE and so on.
ooj right answer .. not bad  (poor response).
Else here has 100 pages for DeLta PulsEe 2 but power scheme does not work well without commemorations.
I applied the advice written here on the forum but weak results, despite the praise that some members have successfully built the project. why many of us poor results
 Idea

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Offline xavier
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« Reply #754 on: September 10, 2012, 12:30:31 pm »
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I suggest you change your attitude. Also in the future you will receiving NO response from me to any of your posts regarding your current build or any other for that matter.   

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Offline satdave
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« Reply #755 on: September 24, 2012, 09:19:06 am »
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Thought you would have gathered that when i say striped alarm cable I meant from the main sleveing insulating the 4 pairs not the actual individual sleveing insulating the eight wires otherwise of course they would short unless wound as a web coil with gaps between each winding, which worth adding if doing it that way lwrs in capacitance considerably

Hope that's put the record straight for anyone else who miss read my post.
Regards

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Offline GoldDigger1950
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« Reply #756 on: September 25, 2012, 12:55:43 pm »
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Quote:Posted by satdave
Thought you would have gathered that when i say striped alarm cable I meant from the main sleveing insulating the 4 pairs not the actual individual sleveing insulating the eight wires otherwise of course they would short unless wound as a web coil with gaps between each winding, which worth adding if doing it that way lwrs in capacitance considerably

Hope that's put the record straight for anyone else who miss read my post.

Are you attempting to use this wire for a coil?

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Offline satdave
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« Reply #757 on: September 25, 2012, 05:10:45 pm »
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Yes used it ages ago for the Minipulse 3 just bundle wound a 6" coil with one of the cores which is solid copper tined .5mm, then lumed with wax string followed by selfmalgumating tape then hospital paper tape, followed by shielding with synthetic graphite giving me 2kohms per sq inch which gave me inductance of 640uh at 2.6ohms.
If you look on my pi minipulse3 project theres pictures of the coil been built together with a dual field coil made out of the same wire.
The coils were only ever made for quickness and cable ive got on hand due to my work.
However the 6" coil worked better than exspected considering, materials cost next to nothing, and the whole thing took about 45mins to make from start to finish.
Next experiment im trying is two .25 mm copper laminated transformer wire twisted together with two nylon type cotton which is what they sometimes use for stiching upper to sole of shoes to try and reduce internal capacitance.  

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« Last Edit: September 25, 2012, 05:24:38 pm by satdave »
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Offline GoldDigger1950
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« Reply #758 on: September 25, 2012, 07:45:14 pm »
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Well, Satdave, if you look at the characteristics of twisted pair wiring, you find that they are wound to keep audio frequencies from leaving the wires and keeping RF from entering the wires. It's very, very inefficient for coil wiring as I have demonstrated here before in other threads. Because of the DC characteristics, the experimenters such as yourself believe you are saving time by winding three or four loops and wiring them in a daisy chain. In fact, what you are doing is diminishing your field strength due to the AC characteristics of twisted pair wiring.

You need a bare, varnish or lacquer coated wire, scatter wound and then varnished or potted into place for the best efficiency in a metal detector coil. If need not worry about the DC resistance until you determine the total output power match. The DC has absolutely nothing to do with frequency. Only the inductance and total impedance affect frequency. Not only that but the coils MUST be built to be off of the main frequency by a minimum of 3db and a maximum of 6db to get the maximum field size and minimum field collapse time. While you may get satisfactory results by toying with things as you do, you will not get optimum results that way.

Basic electronics theory isn't quite good enough with metal detector circuits because you are trying to make a circuit that has a counter intuitive design incorporated into the theory of the device. In other words, most people think you have to have perfect tuning for everything to work. In actual fact, you have to have limited DE-tuning for things to work properly. When you wind a coil to work perfectly, you luck out because of imperfections in the windings. If you wound it with a perfect match, you'd get zero output. That's what you get in a tuned circuit. Plenty of folks here have found that out. Ask Xavier about perfectly matched coils and his results. That 3-6db de-tuning is optimum for a metal detector. If you can get it to work in a bandpass mode with that amount of de-tuning, you optimize your circuitry.

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« Last Edit: September 25, 2012, 07:48:29 pm by GoldDigger1950 »
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« Reply #759 on: September 25, 2012, 11:53:22 pm »
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Quote:Posted by {author}
Ask Xavier about perfectly matched coils and his results.


Ok I'll bite, Hi Mr X did you publish your results re matched coils ?
I would be interested , thanks.

cheers
6666

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