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Offline waseem2005Topic starter
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« Reply #10 on: September 25, 2014, 12:24:45 am »
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Thank you a lot my dear.
I think this is for mono coil, if I want to build coplanar coil (Tx,Rx,Bucking) coils, can I do that in miner 4 pulse induction metal detector?

If I can that, tell me how to connect the three coils together, specially the Bucking coil.

I know that the Rx coil connected with Tx coil in series, its ok (connect end of Tx to the beginning of Rx).

I red in the article by Dave Emery about constructing coplanar coil that you have to connect the bucking coil in series with Tx but with phase reversed.

How to do these connection of Rx, Feedback(Bucking) series with Tx coil?

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« Reply #11 on: September 26, 2014, 07:49:51 am »
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No bucking coil on a PI detector, the coil is turned on then off unlike a VLF machine.

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« Reply #12 on: September 27, 2014, 04:19:22 pm »
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Quote:Posted by xavier
No bucking coil on a PI detector, the coil is turned on then off unlike a VLF machine.



Xavier is Correct !!!   Do not make a coplanar for a Pulse Induction Metal Detector.

You will get better results with either a Mono [single coil] or even better , make a Double D coil !!! 

A DD search-coil will work for a PI and will work better than a Coplanar and reduce the ground effect . 

My suggestion is do a DD configuration and keep the total DC resistance to around 2.5 to 3.5 ohms .  Please no less than 2.5 ohms or you will burn out your power MOSFET Transistor !! 

Best Regards...................Eugene

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Offline waseem2005Topic starter
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« Reply #13 on: September 27, 2014, 11:40:43 pm »
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Thank you my dear for your reply

About DD-coil, Please let me see how to make it for pulse induction metal detector.
For the resistance, I think 2.5-3.5 Ohm is very big, because Pulsdetektor.de explain in their Digger metal detector for search coil, and this MD is the next of Miner 4,And it has same power circuit design (HCPL3120,BUP314,Suppressors),they said the resistance should be between 1.8-2.5 Ohm.
This still for along with metal detector, as they produce Base2-Orion, they said it should be between 1.6-2.5 Ohm.
Note that for Minipuls3 MD the resistance around 3 Ohm.
Don't forget that the coils are Flat Spiral Coils, that mean, it's difficult to reach the 2.5 Ohm with their number windings.
 
See the attachment

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« Last Edit: September 27, 2014, 11:56:06 pm by waseem2005 »
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« Reply #14 on: September 28, 2014, 09:36:14 am »
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The resistance is due to the length of the wire, NOT the way that it has been wound. Where this would apply is with the inductance and internal capacitance of the coil.

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« Reply #15 on: September 29, 2014, 11:18:40 am »
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the coil in the build sheme is not a tx rx combi

this is a coplanar combi

the tx coil is splitted in two coils connected in serie  same winding direction

the theory say that you get homogen field insted of a sharp spiked field

but for projects form pulsdetektor i would recommend you a simple mono wound coil (monoloop)
with enough resistance    change the mtp250eg  for irf 9640   loower resitīstance and more power on coil

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my machines at work http://mueller-meteoriten.se/detektoren.html


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