Detecting in South Africa

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	Re: Detecting in South Africa « Reply #380 on: January 23, 2011, 02:58:47 pm »

Yeah but wouldn't chocolate ice cream pack more energy?

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GoldDigger1950

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	Re: Detecting in South Africa « Reply #381 on: January 23, 2011, 03:00:56 pm »

It depends on whether or not he has a chocolate ice cream meter. I believe his only uses vanilla.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.

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	Re: Detecting in South Africa « Reply #382 on: January 23, 2011, 03:06:36 pm »

It's Pgills fault.......he started it! Grin

viking

Posted on: January 23, 2011, 03:01:10 PM

Now you see I don't go for the whole probe thing anyway, Alien's use probes and that usually ends in tears hehehehe!
I use a pendulum Grin

Viking

Posted on: January 23, 2011, 03:04:06 PM

Pendulums are great you can't beat solid state technology.
Sorry but I am having a good old chuckle on my side of the pond. I am just kidding really!
Viking

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Pgill

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	Re: Detecting in South Africa « Reply #383 on: January 23, 2011, 03:33:34 pm »

Why do I always get the blame for other peoples K@K??? Hello

Oh and Chocolate ice cream is the tastier of the two Kiss

Ok, now lets get back to our important job of finding those gold coins Detecting

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viking Topic starter

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	Re: Detecting in South Africa « Reply #384 on: January 23, 2011, 03:36:35 pm »

Yip well after todays hunt I at least know I am in the right period for gold coins.
That's half the battle won I think.
Viking

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	Re: Detecting in South Africa « Reply #385 on: January 23, 2011, 03:42:35 pm »

GD I know all that OK let me tell you all what I did and how.
First I measured the inductance of my search coil 250uH ( well I knew that I made the coil) ok now I took 0.5mm wire (thats all I had) and wound it on a piece of ferrite till I had 250uH then I measured the resistance of my search coil (2.2R including the cable) then the resistance of the probe if I can recall it was 1.x R I then placed a resistor in series with the probe to get the same resistance and viola. Now when I switch from search coil to probe I don't have to re-adjust my machine. I should have taken some photos when I did it but did not SO if you like I can build another one to show you all Ho yes I placed the probe in a PVC tube (electrical) then filed it with candle wax I thought that way if I wanted to I could change it but it works great so no need. It will detect a coin at 100mm (flat) and about 120mm (standing)

All the best
Regards Xavier

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	Re: Detecting in South Africa « Reply #386 on: January 23, 2011, 03:51:03 pm »

Xavier, so you don't get into anymore trouble :

Please put all that in writing with graphics if you can.... I would really appreciate it very much, and I could use it on my site.... GD, any ideas you may have would also be appreciated..... Great

Now lets make peace not war, oh and that ice cream, save me some will you Grin

Viking, nice finds... you may get a gold coin yet,,,, but remember they are all mine Clapp

and the button, well I have left you a note on the blog.... great find Wink

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xavier

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	Re: Detecting in South Africa « Reply #387 on: January 23, 2011, 04:08:05 pm »

Hi Viking

Well I went and had a look at your blog in fact I enjoyed reading it> I then wanted to leave you a message as did Pgill but when the time came to post it I had to choose some or other rubbish and log onto some other rubbish hell mate I registered what more must I do?

Regards Xavier

Posted on: January 23, 2011, 11:05:36 PM

Pgill

I'll make one and take photos of it step by step it's better that words at most times.

Regards Xavier

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GoldDigger1950

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	Re: Detecting in South Africa « Reply #388 on: January 23, 2011, 04:12:51 pm »

	Quote:	Posted by xavier
GD I know all that OK let me tell you all what I did and how. First I measured the inductance of my search coil 250uH ( well I knew that I made the coil) ok now I took 0.5mm wire (thats all I had) and wound it on a piece of ferrite till I had 250uH then I measured the resistance of my search coil (2.2R including the cable) then the resistance of the probe if I can recall it was 1.x R I then placed a resistor in series with the probe to get the same resistance and viola. Now when I switch from search coil to probe I don't have to re-adjust my machine. I should have taken some photos when I did it but did not SO if you like I can build another one to show you all Ho yes I placed the probe in a PVC tube (electrical) then filed it with candle wax I thought that way if I wanted to I could change it but it works great so no need. It will detect a coin at 100mm (flat) and about 120mm (standing)

Now there you go. That's a much more meaningful and relevant way to use the resistance as a "guesstimate" rather than a calculated inductance. Wire resistance is only an estimate from the manufacturer. Even a diameter shift in one mm of the wire along its entire length can mean a miscalculation of the resistance for the entire length.

The resistor in series acts as a snubber which keeps the collapsing field from feeding EMF back to the circuit and damaging components but it does reduce the power to the coil as well. You did mention that it got warm before you added it.

I'd like to ask you other two to stop the references to war or argument. That's not at all what this is and I find your reference to that to be an insult. Keep that to yourself please. No comment is necessary now, either. Just knock it off.

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« Last Edit: January 23, 2011, 04:14:26 pm by GoldDigger1950 »	Logged

It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.

Let's Talk Treasure!

viking Topic starter

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	Re: Detecting in South Africa « Reply #389 on: January 23, 2011, 04:38:26 pm »

Sorry Xavier
I'm not with you,Pgill
Did you have this issue at all?
I'm not too sure what 8
Xavier is on about?

Posted on: January 23, 2011, 04:13:06 PM

Wow sorry,different sense of humour I suppose.

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