Latest Update March 9, 2014.

"Gary's Pi Metal Detector Coils" ©

Due to the increasing number of Requests I have recieved.
I have now designed and built 2 new Coil Winding Jigs for my Radial Flat Coils.


My Standard Coil Sizes
I can make almost any size up to about 13 inches, but its More Expensve.
(Every change in Outer Diameter Requires I make a Special Inner Diameter Core.)

1)   Approximately 6 inch OD and wound with a 20 1/2 AWG wire.
Approximately 52 Turns
Inductance, approximately 400 uhy measured at 1 Khz.
DC Resistance Approximately 0.68 ohms.

This 6 inch coil is $25.00 US Funds Plus Postage.

2)   Approximately 8 inch OD and wound with a 20 1/2 AWG wire.
Approximately 45 Turns
Inductance, approximately 400 uhy measured at 1 Khz.
DC Resistance Approximately 0.8 ohms.

This 8 inch coil is $25.00 US Funds Plus Postage.

3)   Approximately 10 inch OD and wound with a 20 1/2 AWG.
Approximately 30 Turns
Inductance, Approximately 400 uhy measured at 1 Khz.
DC Resistance aprox 0.8 ohms.

This 10 inch coil is $30.00 US Funds Plus Postage.

4)   Approximately 12 inch OD and wound with a 20 1/2 AWG.
Approximately 26 Turns
Inductance, Approximately 400 uhy measured at 1 Khz.
DC Resistance aprox 0.8 ohms.

This 12 inch coil is $35.00 US Funds Plus Postage.


WHY 20 1/2 AWG Wire?
Origionally I got a good deal on the price of this wire and it is also a Good Size for this application!
However Now in 2012, I usually wind these coils with 22 AWG, "Depending on my current stock situation".
The 22 AWG works as good as the 20 AWG but with slightly higher resistance values and it produces a Lighter weight coil.

Why the 400 uH?
It appears to be a Good Value for general detecting.
I can Produce coils with Lower Inductance,If Wanted
And Reducing inductance values does NOT increase my prices above.

Note:

1) All Coils are Epoxy Coated, but they should be further mounted on a Rigid Surface or in a Suitable Casing.
I usually just use a "Frizbee" as a case for my Coils.

2) Each Coil is individually Tested.
The Number of turns is Printed on it, as well as the Measured Inductance, DC Resistance, Q Value at 1000 Hz,
Interwire Capacitance and its Free Air Resonance.

3) Postage Costs Will Vary, depending where you live!

4) Orders recieved from "Outside of Canada", "May be subject to Duty and Tax" as Might
be Imposed by that Countries various Customs Officals!
Sorry, I have no control over this and I do not want to get in trouble with
the governments involved! But usually this is only a few dollars at most!

Enquire by E-mail for details! Be Sure to include the name of your Country.


Here is a picture showing one of my Conical coils!


Here is how I mount my coils in a Frisbee!

The edges of the Frisbee protect the coil as you move it across the ground.

If you attempt to Pot these coils in Foam, you will most likely Warp or Damage them.

If you use Foam or other Potting Compound, they will also change the Inductance & Sensitivity of the Coil.

This Coil is just Glued in place over 3 small Plastic Strips.


Chemelec

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