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Offline GoldDigger1950
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« Reply #10 on: December 18, 2009, 04:42:50 pm »
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Quote:Posted by Cornelius
I mean  one electrical rubber insulated wire with 6 or 8 core wires , individually colorcoded and insulated  . Solder the wires together , one color to the other coler . Insulate with crimp insulation . Makes a nice coil .   Cornelius


I've never tried it but I can see how it would work as long as the internal wires are scatter collected and not twisted pairs. Even then, the coil impedance would be unpredictable so other circuit components would be needed to make it work. To save a few dollars might be important but the working detector could be far more important. If he wants to treat this as a game of "how cheaply can I do it," then he is on the right track. If he wants to be sure it will work, he needs to break out the pencil and paper to make some calculations before he decides to try the cheapest route. A coil of 1 meter in diameter is not a trivial item. Even a tiny miscalculation in the impedance can mean a difference of several meters of depth lost.

Inventiveness and craftiness in fixing or repairing a car out in the desert is not anywhere near an equivalent to building electronics circuits. Somehow the people here building these things have decided that they can do it without an iota of electronics knowledge or skill and rely on others here to answer their questions. I guarantee he will take your answer and build a coil using his 'free' ADSL wire and come back later asking why it didn't work. Anyone with a background in electronics will know exactly why it didn't work and he will find it nearly impossible to understand the explanation later after he was given the advice of just soldering the ends together. In a nutshell, the twisted pair arrangement in ADSL wire will cause it to fail miserably. That's not a maybe. That's how the cable was designed.

He needs to use bell wire or heating/cooling control wire. He can also use some types of alarm system wire as long as they are not twisted pair wires. That's very important, Cornelius.

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Offline Cornelius
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« Reply #11 on: December 18, 2009, 05:11:14 pm »
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Your remark about having to have some  ( I would say a lot ) of knowledge about electronics and the building of metal- detectors is a must before you want to build anything worthwile . It is too bad that I have to read too many posts of people that have no incling about what it is all about . Too many of the members think that building a  meteal detector is the same as changing sparks-plugs in a car .  I don't know how to tell these people what it is all about . It took me many years to be able to understand what I was doing .  How do I tell these guys that they should not attempt to build anything unless they know what they are talking about .  Beats me !!!!   Cornelius

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Offline GoldDigger1950
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« Reply #12 on: December 18, 2009, 07:48:23 pm »
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Cornelius, I guess we just do what we have been doing. I admire people who are willing to do anything at all by giving it a try but sometimes they have to realize their limitations. Asking advice is good but there is a whole weeks worth of teaching, 8 hours a day, just to teach someone the basics of coils and designing them. Not to mention the knowledge they must have before they start a design. Somehow they think that just wrapping wire in a circle is all it takes. You're right. It beats me, too.

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Offline Tuxnor
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« Reply #13 on: November 11, 2012, 04:42:18 pm »
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The Detector Pro Headhunter Pulse coil work great for me on my Delta Pulse,,,3 years  no problem,,no heating
sensitive...could be more sensitive on gold but that is a configuration case (will be tuning DP this winter for max gold)

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Delta pulse metalldetektor tuning.MOV


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