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Offline haikel774Topic starter
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« on: May 10, 2011, 02:54:13 am »
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hi Wink


I have a delta pulse i use a 45cm coil.but it detects only 10cm

what's the problem what can i do?


thank you very much for all


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Offline ram
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« Reply #1 on: May 10, 2011, 08:40:08 am »
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Quote:Posted by haikel774
hi 


I have a delta pulse i use a 45cm coil.but it detects only 10cm

what's the problem what can i do?


thank you very much for all



keep in mind, dp is deeper pi md, it is working good on big targets and operating at low freq 100hz-400hz. so, you must know your target. 45cm for coins not good. try metal box 12"x8"x6". max detection underground at any soil condition is 5ft even on salt water.(in 45cm coil) i tried it in my dp.

ram,

ramso,

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Offline hesamavr
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« Reply #2 on: May 10, 2011, 09:20:11 am »
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Quote:Posted by ram

keep in mind, dp is deeper pi md, it is working good on big targets and operating at low freq 100hz-400hz. so, you must know your target. 45cm for coins not good. try metal box 12"x8"x6". max detection underground at any soil condition is 5ft even on salt water.(in 45cm coil) i tried it in my dp.

ram,

ramso,


Dear Ram, your DP didn't have instability problem?

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Offline ram
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« Reply #3 on: May 11, 2011, 07:56:09 am »
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Quote:Posted by hesamavr
Dear Ram, your DP didn't have instability problem?


yup, it din't experienced instability. i use 12volts 7ampere motorcycle battery MF12. then i used lm337 adjustable negative regulator for exact 10.6volts. i din't use the resistor 1ohm from positive 12 supply going to mosfet. i use irf740. idin't use the high voltage diode in series to mosfet going to coil. mentioned resistor and diode and the unregulated negative 10.6 volts can cause to my dp instability. and i set it on 100hz operating frequency for big targets.

ram,

Posted on: May 11, 2011, 07:51:46 AM
Quote:Posted by hesamavr
Dear Ram, your DP didn't have instability problem?



also in my experiments, i tried the tl082 it has better stability on urban areas w/electric post and high electrical distortions.

ram,

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Offline hesamavr
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« Reply #4 on: May 11, 2011, 01:56:03 pm »
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Quote:Posted by ram
yup, it din't experienced instability. i use 12volts 7ampere motorcycle battery MF12. then i used lm337 adjustable negative regulator for exact 10.6volts. i din't use the resistor 1ohm from positive 12 supply going to mosfet. i use irf740. idin't use the high voltage diode in series to mosfet going to coil. mentioned resistor and diode and the unregulated negative 10.6 volts can cause to my dp instability. and i set it on 100hz operating frequency for big targets.

ram,

Posted on: May 11, 2011, 07:51:46 AM

also in my experiments, i tried the tl082 it has better stability on urban areas w/electric post and high electrical distortions.

ram,


Thank you very much for your reply Ram. would you please explain this negative -10.6V more. where should we inject it and should we remove some parts from circuit? I appreciate if you explain on schematic.

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« Reply #5 on: May 13, 2011, 07:58:41 pm »
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remove those parts, resistor,hi voltage diode at the mosfet.

remove those two diode at power supply negative, replace it with lm337 adjustable negative regulator and adjust to 10.6volts negative to supply the board. only negative 12volts will directly go on mosfet source.

ram,

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Offline GoldDigger1950
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« Reply #6 on: May 14, 2011, 03:52:10 am »
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Ram, you can't just add an LM317. It requires a lot of support circuitry.

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« Reply #7 on: May 14, 2011, 05:48:34 pm »
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Quote:Posted by GoldDigger1950
Ram, you can't just add an LM317. It requires a lot of support circuitry.



yup gd 1950, i think he knows the lm337 negative vol reg. maybe he can google the datasheet.

ram,

Posted on: May 14, 2011, 05:45:25 PM
here's the datasheet of lm337,

ram

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Offline raff33
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« Reply #8 on: July 19, 2011, 07:00:30 am »
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Hi ram ,
can you please explaine more about how connecting LM 337 leads ? and how to regulate for 10.6v ? i am not so good in electronic
many thanks

Posted on: July 19, 2011, 06:56:09 AM
many thanks again
regards

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« Reply #9 on: July 21, 2011, 06:31:39 am »
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lm 337 data sheet just follow the instruction given.

ram,

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