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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) >

Revised schematic of SBG-PI

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fff

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	Re: Revised schematic of SBG-PI « Reply #30 on: June 07, 2011, 11:48:12 pm »

Scheme works in both ways of connecting C3 and C4.60ms. delay is better for mineral soil . Good discrimination is only possible with the use of search Head with two coil -transmitter and receiver.

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WM6

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	Re: Revised schematic of SBG-PI « Reply #31 on: June 08, 2011, 02:02:47 am »

Quote from: fff

C3 and the C4- correct connection

Hi fff. As I understand your correction, C3 and C4 are not connected to -V, as on PCB?

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	Re: Revised schematic of SBG-PI « Reply #32 on: June 08, 2011, 04:01:06 am »

	Quote:	Posted by fff
Scheme works in both ways of connecting C3 and C4.

OK thanks!

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	Re: Revised schematic of SBG-PI « Reply #33 on: June 08, 2011, 08:28:02 am »

	Quote:	Posted by WM6
Hi fff. As I understand your correction, C3 and C4 are not connected to -V, as on PCB?

Hi WM6. Correction: C3 and C4 to -V is right, see once again the scheme. But fff said it was all one.

Posted on: June 08, 2011, 08:24:29 AM

	Quote:	Posted by fff
Scheme works in both ways of connecting C3 and C4.60ms. delay is better for mineral soil . Good discrimination is only possible with the use of search Head with two coil -transmitter and receiver.

Hi fff. Can you put the scheme with the connection of search head with two-coil transmitter and receiver?

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mikebg

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	Re: Revised schematic of SBG-PI « Reply #34 on: June 08, 2011, 09:35:46 am »

	Quote:	Posted by fff
Scheme works in both ways of connecting C3 and C4.60ms. delay is better for mineral soil . Good discrimination is only possible with the use of search Head with two coil -transmitter and receiver.

WM6, it is time for you to stop using MONOCOIL (even in pinpointers:-)

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	Re: Revised schematic of SBG-PI « Reply #35 on: June 08, 2011, 10:29:44 am »

Mikebg !!

Great you are here again , helping on our Forum !!

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

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	Re: Revised schematic of SBG-PI « Reply #36 on: June 08, 2011, 01:37:27 pm »

	Quote:	Posted by mikebg
WM6, it is time for you to stop using MONOCOIL (even in pinpointers:-)

Till discrimination was not 100% at full detecting depth, I am not interesting in any other coil than mono.

Mono has many advantages over other design in first line lightweight, then wider possibilities of design targeting different coil parameters. Don't worry, I made enough other designs that I known potential of different coil design, in short: not worth the trouble and pain in elbow. Proven in praxis.

Maybe in theory it is different, but I left this problem to theory, to dispute it.

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	Re: Revised schematic of SBG-PI « Reply #37 on: June 09, 2011, 12:20:24 am »

The picture shows the only way to display the type of metal with one coil. Strobe pulses may be more .Discrimination not always true.Detector is PI tip.

Posted on: June 09, 2011, 12:11:57 AM

t2 is 80-200 microsecond.

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There are 2 attachment(s) in this post which you can not view or download Please register for viewing them. pi mono coil discr..JPG pi mono discr..JPG
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WM6

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	Re: Revised schematic of SBG-PI « Reply #38 on: June 09, 2011, 02:15:58 am »

Quote from: fff

t2 is 80-200 microsecond.

Thanks for tip fff.

Question 1: T2 is 80-200usec from flyback start or from T1/S1 end?

Question 2: Do you think to implement proposed discrimination solution in your SBG-PI schematic and how?

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	Re: Revised schematic of SBG-PI « Reply #39 on: June 09, 2011, 02:44:11 am »

	Quote:	Posted by fff
The picture shows the only way to display the type of metal with one coil. Strobe pulses may be more .Discrimination not always true.Detector is PI tip. Posted on: June 09, 2011, 12:11:57 AM t2 is 80-200 microsecond.

Sascho, please show how seems the output of preamp with separate induction balanced TX and RX coils because WM6 keeps to insist that the MONOCOIL is useful and delivers enough depth. I don't believe that he have tested a PI with IB coils, because he can't draw the decay curve. Wink

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