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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > PI Designs & Deepseekers (Moderators: Eugene52, Cornelius) >

HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS

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Eugene52

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #420 on: January 19, 2019, 04:20:41 pm »

	Quote:	Posted by pppp
hi, there you have full documentation for 2nd chance pi by PaWol You are not allowed to view links. Please Register or Login http://chomikuj.pl/dantech/2nd+ChancePI

When somebody posts a Video on this Forum here of a Full Discrimination PI , Pulse induction Metal Detector that detects a penny, nickle dime and quarter, or gold. And says so on the machine, Let me know !!!!

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

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pppp

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #421 on: August 09, 2019, 11:20:25 am »

The latest firmware v32 is available

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http://chomikuj.pl/dantech/2nd+ChancePI

Fully working and free for personal use. There is only 10s long message at start about limitations

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #422 on: August 20, 2019, 03:40:48 pm »

	Quote:	Posted by pppp
The latest firmware v32 is available

Is not there version v33 already?

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #423 on: August 20, 2019, 10:59:31 pm »

	Quote:	Posted by WM6
Is not there version v33 already?

Looks like that at the time of the post #421
It was not available

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #424 on: November 07, 2019, 07:13:39 pm »

The chance detector relies on a low capacitance coil for fast responses. I wonder how a coil with ideal capacitance would perform, like a bifilar arrangement.

Nikola Tesla's patent for improvements in electromagnetic coils indicates that such a coil can have no opposition aside from ohmic resistance.
Quoted from his

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patent

: "permits a current of given frequency and potential to pass through it with no other opposition than that of ohmic resistance". Self-induction is neutralized.

The potential downside of bifilar coils is the capacitance. Though it should naturally be at the ideal value for any given coil. Potential difference is half of the supply voltage between any adjacent windings.

I believe when there is negligible self-induction, the inter winding capacitance might not be a problem. Perhaps such a coil can be used for a fast Pi, it's simple to wind.

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #425 on: April 24, 2020, 11:08:22 pm »

Greetings,

I bought a Quasar ARM controller from ebay. I saw on one of the packages from the full detector model listed and it said VLF tester on the box. However, in the title of this post, it looks like it is a pulse detector. My display and model looks exactly like the photo. Is it VLF or pulse detector? Or is it both?

Regards,
krazdigger

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #426 on: April 29, 2020, 12:05:27 am »

I've looked up Quasar ARM detectors, and they are VLF. The Double-D coil design gives it away, though it's possible to use DD coils for both VLF and PI detectors.
There's no mention of pulse induction capabilities in the listings I found

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #427 on: April 29, 2020, 07:50:58 am »

Thank you,

I also bought a Clone PI AVR. It is a pulse detector and has no discriminator, but can quickly dig everything because its in constant pinpoint mode. With the round search coil you can easily tell the shape of the target.
It also has a deep search pattern. I use this detector to clear out an area of trash then use my detectors with descriminator. However, this PI detector cannot detect the little bit of gold nuggets or little vile of gold powder.
My Garrett AT Max detects both. The PI detector Freq. is 7.5 kHz, is that why it does not detect the gold?

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #428 on: April 29, 2020, 04:28:14 pm »

thanks to our member 6666 (posted in an other forum)
read this and you will find the answers

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http://chemelec.com/Projects/Metal-1a/Understanding-the-PI-Detector.htm

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https://www.minelab.com/__files/f/11043/KBA_METAL_DETECTOR_BASICS_&_THEORY.pdf

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	Re: HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS « Reply #429 on: May 25, 2020, 03:50:34 am »

chemelec link broken....404 error forbbiden Cry

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