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Offline xavierTopic starter
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« Reply #20 on: November 10, 2010, 03:57:18 am »
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 I still think that you have a short as I had a very similar problem with the first one that I build found the short quite by accident six weeks later a real bummer that was. Hope that you get it working soon by the by I will be sending you some photos soon.

Regards Xavier

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Offline seanengman
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« Reply #21 on: November 10, 2010, 04:11:47 am »
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Question: I noticed on your sample coil you wires were very neat and stacked. Is that a necessity or is it just personal preference?

Thanks

Sean

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Offline xavierTopic starter
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« Reply #22 on: November 10, 2010, 07:51:20 am »
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Hi Seanengman

If you are going to make more than one coil and you want them to operate in the same way with the same inductance you have to make coils that are neat if you are going to make a once off coil then jumble winding will be fine but you may loose out on a bit of performance (probably not even noticeable) on the other hand I had a schematic of a detector and the coil was to be 100 turns wound on any former of what ever was the diameter. I made two coils for this detector one I jumbled wound and it worked very well the other I wound nice and neat in layers and it did not work anymore(VLF). But I do believe in making neat coils for my PI detectors I believe that they will work better and yes it is a preference of mine.

All the best
Xavier

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Offline GoldDigger1950
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« Reply #23 on: November 10, 2010, 11:50:07 am »
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Most air core coils are scatterwound. Theoretically, when the coil wires are side by side there is a lot of interwire capacitance in the circuit. If this was taking into account in the design, it works very well. If not, it may cause problems. As you already know, you just have to try it.

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Offline Idaho Jones
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« Reply #24 on: November 10, 2010, 02:18:01 pm »
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Very neat project Xavier, nice design. Smiley

Another option for automating the wire placement might be to use the levelwind off an old fishing reel.

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Offline xavierTopic starter
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« Reply #25 on: November 10, 2010, 02:31:43 pm »
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Hi Idaho Jones

Thanks I have put it on stand by for the moment but I will resume in a week or two just need to get some veroboard first to mount the electronics that is partly on veroboard and partly on breadboard so it looks like a birds nest at the moment LOL I also need to find a motor for it but I think that I know where to find one, so as soon as I have more done on it I will post some photos.

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Offline GoldDigger1950
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« Reply #26 on: November 10, 2010, 04:42:58 pm »
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Quote:Posted by xavier
I also need to find a motor for it but I think that I know where to find one.

Not free, but very cheap. At 12v, 5 RPM and geared heavily, it should be a dream to control with a foot switch from a sewing machine.

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At US$13.00 including shipping, it looks perfect for your application.

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« Reply #27 on: November 10, 2010, 06:53:39 pm »
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Looks quite similar to the one I'm using and a better price as I had to pay shipping from Electronic Goldmine.  I wasn't able to stall mine, when I increased my grip on the wire the spongy rubber wheel just skidded over the coil forms edge, powerful little buggers they are.

Dennis

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Offline xavierTopic starter
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« Reply #28 on: November 11, 2010, 01:08:54 am »
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Found one this morning it looks grotti but it works fine must say that it's over kill at 24v but when it's free it's perfect  Great

Regards Xavier


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« Reply #29 on: November 11, 2010, 01:17:20 am »
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Yup that's pretty grodie alright but with a little TLC it should be more than ready for service.  I agree free is the best price.

Take care,
Dennis

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