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Offline fffTopic starter
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« Reply #60 on: September 02, 2011, 01:02:22 am »
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When the delay is less than 30 should be reduced  of turns of the coil .

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Offline WM6
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« Reply #61 on: September 13, 2011, 03:57:44 pm »
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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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Global capital is ruining your life?
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« Reply #62 on: September 20, 2011, 09:38:28 am »
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hi, this detector with discrimination or not?

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« Reply #63 on: September 20, 2011, 09:54:14 am »
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Hi deep max
 NO,,,, Rarely there is no discrimination in PI.

best time
j.

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Offline mikebg
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« Reply #64 on: September 29, 2011, 09:24:19 pm »
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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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« Reply #65 on: September 30, 2011, 02:08:02 am »
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Quote:Posted by deep max
hi, this detector with discrimination or not?


Not yet!

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« Reply #66 on: November 01, 2011, 01:57:39 pm »
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 To mikebg
My respects.
Sascho

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« Reply #67 on: November 14, 2011, 01:36:24 pm »
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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 Smiley

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« Reply #68 on: November 15, 2011, 12:25:25 pm »
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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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« Reply #69 on: November 15, 2011, 01:13:57 pm »
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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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