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Offline luigi cataldiTopic starter
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« on: May 01, 2015, 12:38:11 am »
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Hello friends  Smiley
I recently bought a kit of self surf PI 1.2, I wanted advice on the construction of a coil that gives me high performance.

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« Reply #1 on: May 01, 2015, 12:40:40 am »
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mybe help for you..

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http://www.adrianandgenese.com/blogger/2012/07/13/how-to-build-a-surf-pi-1-2-pulse-induction-metal-detector-from-a-diy-kit/


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« Reply #2 on: May 01, 2015, 12:49:52 am »
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thank's cool2010
I've tried it, only that I wanted something more powerful Smiley

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« Reply #3 on: May 01, 2015, 01:00:43 am »
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watch this mybe interesting for you  Wink

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http://www.youtube.com/watch?v=bIGa3vhjd5I


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« Reply #4 on: May 01, 2015, 01:15:58 am »
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 Cheesy very beautiful coil
because I understand little English and use google translator to speak here
that wire used, and how many rounds you do?

sorry to bother you!!

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« Reply #5 on: May 01, 2015, 01:20:00 am »
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thats not my design  Smiley  but 5.11 min writing at the screen coil details but that details not for basket one.... but not clear i think..

and read this topic if you have coil problems .. damping resistors and more..

Making a SURF PI 1.2

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and look another topics about surf pi ...too much topics about for surf pi .. youll find interesting informations..

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« Reply #6 on: May 01, 2015, 01:40:20 am »
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ok Smiley
ok I have an enameled copper wire from 0.30
I calculate an inductance of about 350 and adapt them resistance
right?

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« Reply #7 on: May 01, 2015, 01:47:34 am »
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yea i used 320... but changed later for 280  Smiley..

try for best results .. 350..320...

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« Reply #8 on: May 01, 2015, 01:56:55 am »
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I made two calculations with calcoil with 280 uH and wire from 0.30 is a resistance of 3.35 ohm
too high?

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« Reply #9 on: May 01, 2015, 02:02:50 am »
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i read some info nybe helpfull for you and the others..

 kenny444 wrote..

with 610R damping, having popped out the 390R and used a [1200R in parallel with a (1K2 pot plus a 200R series pair)] and used the scope to check the wave form and settled for the 610R. I am though going to set up a (scope, frequency counter and a sig gen) and work out the individual damping for each coil and then put the "R" in with the coils and leave it off the pcb, which means I can use different coil sizes and cables on the same PCB..
 
but ossiloskop nice for that.. if you havent osc.. youll find pc osc for that .. youll find that in this forum.

and more.. from  Martin B

 The buzzer that comes with the kit is ok, but ive swapped it for a small 1.25 inch loudspeaker, which is a little less harsh in tone. The offset control zeroed fine, and the pulse waveform looks roughly how it should on the oscilloscope. The Delay control doesnt seem to have much effect though, I suspect because the coil isnt properly damped. The next step is to rig an adjustable damping resistance, and properly match the coil and damping resistor.Ultimately, instead of the damping resistor thats included on board, I will fit the matched resistors into the coils themselves. That makes it possible to change coil for different sizes and purposes, such as a huge coil for really deep searching, or a tiddly little coil for pinpointing.

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