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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Modifications, Do It Yourself & Repairs (Moderators: Eugene52, xavier, GoldDigger1950) >

PCB for the deepest PI in the market?

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	PCB for the deepest PI in the market? « on: January 07, 2018, 05:46:57 am »

This is my first project and I'm going to build a PI metal detector that can go very deep (15 feet). Do you have a link to the PCB?
Also , I need to make a custom 5 feet coil for it too.

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	Re: PCB for the deepest PI in the market? « Reply #1 on: January 07, 2018, 11:24:27 am »

Welcome to the Forum. Please drop into the New Users thread with a Introduction ?

What would you be looking for 15ft down ? That would require a SIZABLE target for any machine.

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	Re: PCB for the deepest PI in the market? « Reply #2 on: January 07, 2018, 02:01:44 pm »

Hi homefire,
I'm looking for tunnels and cavity in a cave. But it may contain some big chambers containing bronze, hemlets and some jewelries. The chambers can be as big as a mini cooper car. That's what I've been told.

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	Re: PCB for the deepest PI in the market? « Reply #3 on: January 07, 2018, 03:08:44 pm »

The older Whites TM808 had a Cave Mode. No Longer Made with that capability. If your wanting to DIY a PI I know of none with the Void or Cave feature. Something like the Deepers / Sniffer XR71 with 1m coil could find targets like that. Plenty have been made.

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http://www.thunting.com/smf/pi_designs_deepseekers/unified_delta_pulse_sniffer_xr71_schematic-t9706.0.html

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	Re: PCB for the deepest PI in the market? « Reply #4 on: January 07, 2018, 07:54:34 pm »

Thank you. The kit seems to detect objects up to 5m depth. I'll look for the parts and coild design.

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	Re: PCB for the deepest PI in the market? « Reply #5 on: January 07, 2018, 08:36:34 pm »

Nothing Special about the Coil.

The original searchcoil of the delta pulse was measured at 1000 uh [micro-heny] inductance.
Try not go below 2.4 ohms dc resistace on your search coil. As you can see on the schematic
R51 has been added [1 ohm 1 watt]in series with T1 [IRF740]for current protection .

A 60 cm coil is 25 turns of 0.5 mm wire .
a 42 cm coil is 29 turns of 0.5 mm wire . Always measure final DC resistance on your prototype
search coil and always try to be above 2.4 ohms . You can put a heat sink on T1 !!
be above 2 ohms !!

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	Re: PCB for the deepest PI in the market? « Reply #6 on: January 07, 2018, 08:39:47 pm »

Thanks for the hints. Does it matter if I design a square shape coil?

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	Re: PCB for the deepest PI in the market? « Reply #7 on: January 07, 2018, 09:26:44 pm »

That is what they used. 1 x 1 meter I think.

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