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Offline imperatorTopic starter
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« on: May 06, 2009, 01:49:56 am »
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hi all

can I build pi metal detector's search coil on pcb ?


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Offline Paul A
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« Reply #1 on: May 06, 2009, 02:35:46 am »
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Yes you can.
There used to be a company here in the U.K. that supplied a spiral wound pcb coil as part of a "Build yourself" p.i. detector kit.
I've thought about trying to make one as it might well have some advantages (weight for one!).
as for housing it, i guess just wrap in fibreglass tape and job done!
Let us know how you get on!


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Offline Homefire
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« Reply #2 on: May 06, 2009, 08:11:01 am »
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Im working on this my self!

Trying to locate a program to print the spiral coil to acetate and transfer to clad.

I have a old Garrett SeaHunter XL500 Im playing with modding it for other uses.


These Folks have a good selection of housings.     

 

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http://www.hayselectronics.com/parts.htm
 

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Offline imperatorTopic starter
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« Reply #3 on: May 06, 2009, 09:23:13 am »
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thank's for your answer

how can I draw spiral pattern in my pc ?

best regards

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Offline Homefire
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« Reply #4 on: May 06, 2009, 10:02:37 am »
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Here is what I have to work with at this time.

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http://deepfriedneon.com/tesla_f_calcspiral.html


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http://www.csgnetwork.com/spiralcoilinduccalc.html


I too am looking a program to draw it.

Let me know if you find something!

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Offline DOOLEY1972
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« Reply #5 on: May 30, 2011, 01:58:53 pm »
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sounds like a good idea to me , i hear that the tesoro sand shark pi has a printed circuit search coil , if they do it , there must be something in it .
  suspect whether a one off or in mass production pcb easyer than winding and holding a flat planar coil.

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« Reply #6 on: May 30, 2011, 05:13:41 pm »
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I seen a open one.  Nothing inside.

I just need a way to draw one. Cool

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« Reply #7 on: May 31, 2011, 06:27:37 am »
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hello to all here's sample of pcb coil from sprint layout 5.

ram,

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spiral coil sample.jpg

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GARY PI
« Reply #8 on: May 31, 2011, 08:18:47 am »
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I read somewhere in the net that it has many disadvantages, including weight as well as no internal capacitors between the windings and some of them, which weake.
best time
j.

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« Reply #9 on: May 31, 2011, 08:40:41 am »
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Thank You Ram!  I can play with that for a while.

Have you tried one?   I will try to calculate uH on this one.

Any way you can make up another with about ten more lines?

Going for Gold here!  How about a  3 X 9  Right Angle version?


Japanese,  On the PI Less Coil Capacitance = Faster Coil.  That's the reason for going to Etched coil.

Thank You Folks!

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