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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

best Regards

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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 resit´stance and more power on coil

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my machines at work http://mueller-meteoriten.de


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Offline waseem2005Topic starter
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« Reply #16 on: October 30, 2014, 08:57:33 am »
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Quote:Posted by bernte_one
hello waseem

i can help you of the most projects from pulsdetektor
suggestion was to use liyv litz wire  0,25mm2   3R  500µH +

pulsdetektor was a good site long time ago
you can find the old projects

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and yes the inventor/owner makes money with the commercial systems
but he has still a diy area where you can find projects that cost hobby prices
and please understand no one will make you a gift
you still have to pay the parts  as he has to do

minpulse and miner were good projects

also the tiny and the twiggy


Thank you a lot, but what is the meaning of 500µH + ?
Is it mean that the inductance should be from 500µH  and more (0.5mH to 1mH) ?

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« Reply #17 on: October 30, 2014, 12:38:46 pm »
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ok lets say 400 till 600µH will work

the rest is not tested by my own

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« Reply #18 on: October 30, 2014, 04:33:00 pm »
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Quote:Posted by bernte_one
ok lets say 400 till 600µH will work

the rest is not tested by my own


Thanks for reply.

You mean that you test a mono coil with inductance from 400 till 600µH, and it work ?

What is the damp resistor you used with this mono coil from 400 till 600µH ?

What happens if we use mono coil with inductance from 300 till 400µH, is it work very well with 1K ohm/5W damp resistor ?

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« Reply #19 on: November 05, 2014, 05:19:27 am »
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You can't just go changing everything and hope that it will work, you need to calculate everything first. If they tell you to make a coil of 500uH then you should do it, get the detector working first then try your hand at doing mods to it but with your limited knowledge in electronics you will have to go by trial and error and that could become a costly operation.  Build the thing as it should be, get it working and go out detecting is my recommendation to you.  

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« Last Edit: November 05, 2014, 05:21:41 am by xavier »
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