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Offline xavier
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« Reply #580 on: April 08, 2011, 10:02:00 am »
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24 AWG = 0.511 mm, resistance = 84.22 Ohm's per Km, 16 turns = 64m, resistance = 5.39 R I'm working on a calculator that will give an estimate of the inductance and I don't have a 1m x 1m coil so I cant give you the inductance at the moment all that I can tell you is that 5.39 R looks a bit high but you don't kneed a fast coil for large objects so this one should work fine.

Regards Xavier 

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So many questions so little time

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« Reply #581 on: April 08, 2011, 10:09:04 am »
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Thank you all !!!
I will get some experiments these days,and post the results.
fixxx

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Offline lazo
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« Reply #582 on: April 09, 2011, 09:07:35 am »
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Are there other substitutes for the LF357 in Delta Pulse / Sniffer ?
Thank you.

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Offline xavier
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« Reply #583 on: April 09, 2011, 09:24:48 am »
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I have been told that there was but I have not found one yet that works like the LF357 remember that it has been discontinued so finding them can be a bit of a pain.

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« Reply #584 on: April 09, 2011, 10:20:43 am »
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Yes,it's hard to find LF 357,i ordering these from Slovenia(i am from Serbia).
Regards...........fixxx

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Offline xavier
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« Reply #585 on: April 09, 2011, 11:22:20 am »
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The thing is the 50V/us slew-rate but you could try the NE5534 and LM318 so I've been told.

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« Reply #586 on: April 09, 2011, 12:17:53 pm »
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A little work on the big coil..... Smiley

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« Reply #587 on: April 09, 2011, 12:29:56 pm »
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Hi  lazo,fixxx
   LF357 can replaced=LF356,tl071,NE5534

best time
j.

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Offline raff33
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« Reply #588 on: April 11, 2011, 04:11:13 am »
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Hi,
for me TL071 give the same result az LF357

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Offline satdave
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« Reply #589 on: May 02, 2011, 07:07:01 pm »
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Quote:Posted by Logenxxx
Hello to all!
Hi noticed you used single sided pcb, was that taken from the final pcb layout plus circuit put on here?
Because if so i will start mine

Many thanks

I am submitting here my finished project and it works pretty good. I make a simple temporary 6" search coil and can detect a single coin at 8" deep.

Thanks a lot to Eugene for sharing his time and talents.
More power to you and to thunting.com

Logenxxx


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