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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 #60 on: September 02, 2011, 01:02:22 am »

When the delay is less than 30 should be reduced of turns of the coil .

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WM6

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	Re: Revised schematic of SBG-PI « Reply #61 on: September 13, 2011, 03:57:44 pm »

	Quote:	Posted by fff
When the delay is less than 30 should be reduced of turns of the coil .

What is main problem that we need to reduce Nr. of turns to get delay < 30ms, coil impedance?

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deep max

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	Re: Revised schematic of SBG-PI « Reply #62 on: September 20, 2011, 09:38:28 am »

hi, this detector with discrimination or not?

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japanese

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GARY PI

	Re: Revised schematic of SBG-PI « Reply #63 on: September 20, 2011, 09:54:14 am »

Hi deep max
NO,,,, Rarely there is no discrimination in PI.

best time
j.

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mikebg

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	Re: Revised schematic of SBG-PI « Reply #64 on: September 29, 2011, 09:24:19 pm »

	Quote:	Posted by WM6
What is main problem that we need to reduce Nr. of turns to get delay < 30ms, coil impedance?

The main problem is resonance frequency of TX network. Instead to reduce turn number, we should reduce the equivalent capacitance of tank circuit, formed by TX coil. This problem was discissed in geotech1 forum.

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	Re: Revised schematic of SBG-PI « Reply #65 on: September 30, 2011, 02:08:02 am »

	Quote:	Posted by deep max
hi, this detector with discrimination or not?

Not yet!

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	Re: Revised schematic of SBG-PI « Reply #66 on: November 01, 2011, 01:57:39 pm »

To mikebg
My respects.
Sascho

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	Re: Revised schematic of SBG-PI « Reply #67 on: November 14, 2011, 01:36:24 pm »

hi, please tel me how can a high sound with amplifer and how? Because i building this detector but sound is very low.Thank you

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Barracuda

	Re: Revised schematic of SBG-PI « Reply #68 on: November 15, 2011, 12:25:25 pm »

Hi deep max. You're likely to put the 8-ohm speaker. You have to put piezo or headphones with high impedance.

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	Re: Revised schematic of SBG-PI « Reply #69 on: November 15, 2011, 01:13:57 pm »

Use 36 ohm speaker and 470 nf capacitor connection one after another .

Posted on: November 15, 2011, 12:59:01 PM

Original piezo is big-see image

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