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Post by Deleted on Feb 4, 2009 9:05:11 GMT -8
Hello,
I need to wind about 163 (120+43) turns of 0.3mm copper wire around a short 4.9 cm ferrite rod (it's for a small metal detector)
I suspect that there will be too many turns in the coil to wind it in one layer, so I'll presume that I'll have to wind it in layers. But I was wondering how this should be done precisely; as I understand it, the windings should be in one direction, but I guess it is "not done" to start winding a coil, say, from left to right, and then, at a certain point, continue winding from right to left.
Is the solution to this problem that I should begin winding a first layer (for example from left to right) and at a certain point return to the beginning of the rod and start winding a second layer, also from left to right?
In other words, say I have to wind a coil of 30 windings, but I only have room for 10 on the rod, and have to wind 3 layers of 10 windings each, does winding nr. 11 have to be above winding nr. 1 and winding nr. 21 above winding nr. 11?
I thank you in advance for your help.
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Post by Gary Lecomte on Feb 4, 2009 11:03:17 GMT -8
Hello, I need to wind about 163 (120+43) turns of 0.3mm copper wire around a short 4.9 cm ferrite rod (it's for a small metal detector) I suspect that there will be too many turns in the coil to wind it in one layer, so I'll presume that I'll have to wind it in layers. But I was wondering how this should be done precisely; as I understand it, the windings should be in one direction, but I guess it is "not done" to start winding a coil, say, from left to right, and then, at a certain point, continue winding from right to left. Is the solution to this problem that I should begin winding a first layer (for example from left to right) and at a certain point return to the beginning of the rod and start winding a second layer, also from left to right? In other words, say I have to wind a coil of 30 windings, but I only have room for 10 on the rod, and have to wind 3 layers of 10 windings each, does winding nr. 11 have to be above winding nr. 1 and winding nr. 21 above winding nr. 11? I thank you in advance for your help. Reply With Quote IF its the transistor "Pinpointing" Metal detector that I have seen on the internet, you can "Scramble wind" the wire. (Just wind it in a Bundle, not neat layers.) Also, it doesn't matter of you wind both coils in the Same Direction. What matters is that if it doesn't work when you wire it to the circuit, Just Reverse the wire connections on One Coil and it will correct it. PS: The Circuit works OK, as claimed, but I'm not very impressed. I can Pinpoint just as good with my PI Detectors using an 8 inch coil and with much greater distance of detection. Gary |
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Post by Deleted on Feb 5, 2009 14:31:13 GMT -8
Thanks a lot for the reply!
I'm actually making the Velleman kit k7201...
Would it harm the project to wind the coils in layers as described (winding nr. 11 above winding nr. 1, etc.)?
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Post by Gary Lecomte on Feb 5, 2009 20:45:21 GMT -8
Sorry, No Comment as I haven't seen that kit or schematic of it.
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Post by Deleted on Feb 6, 2009 6:48:56 GMT -8
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Post by Gary Lecomte on Feb 6, 2009 7:29:59 GMT -8
If you look at the Picture of the Assembled detector, It IS a SCRAMBLE WOUND Coil. I would recommend you make it that way. If you LAYER Wind your coil, It will have a Higher Inductance, and MAY Not Work as good. Gary |
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Post by Deleted on Feb 6, 2009 10:30:48 GMT -8
Thank you very much for your valuable advice!
P.S.: I would like to congratulate you with your webpages describing how to build a PI Metal Detector. It is the ONLY website I know up to this date that features such accessible and complete instructions on building a PI detector...I am currently collecting all the necessary parts to build the single coil design...
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Post by onerouser on May 15, 2009 11:19:59 GMT -8
good day to you sir, I'm WONDROUS Silva, 24 yrs. old, from Philippine,actually this is just my first time to join a forum.,i really appreciate to this site. i've got an interest to join to this forum becausE for Somethng that i want to know more about in making a metal detector.coz im alSo love to find treasUres.its really hard to find treaSUreS w/o sOme equipments to usE.,
my firsT problem Sir that encountered is on how to make a coil, i mean to install or to roll it.,
thank you very much sir.,more power'
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Post by onerouser on May 15, 2009 11:36:37 GMT -8
good day to you sir,i'm from philippines, at first i just want to thank you for thiS wonderful webSIte.Actually sir my firsT problem was on how to wind a wire preciSEly to what i want it to be,.
will you pls give us sOme technique to wind it easy.
thank you very much.
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Post by berkins on Jun 1, 2009 12:17:59 GMT -8
how to built search coil transmiter and receiver coil with feedback wide26cm frequence*6.5khz *
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Post by Gary Lecomte on Jun 2, 2009 5:51:55 GMT -8
how to built search coil transmiter and receiver coil with feedback wide26cm frequence*6.5khz *  I think you need a MUCH BETTER Explaination of what you want. Search Coil for What? Why 6.5Khz? (An Audio Freq.?) 26cm? Doesn't make any sence to me. |
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