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Offline wilTopic starter
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« on: February 13, 2010, 01:28:36 pm »
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Does anyone want to comment on the depth prnetration of a bfo detector?

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Offline xavier
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« Reply #1 on: February 15, 2010, 12:03:37 pm »
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Hi Wil

Some BFO detectors have a fairly good ground penetration there main problem is stability they are very sensitive to temperature change the one that I build had a ground penetration of about 150mm. I am still convinced that if one could make a BFO that is stable that it could be a good machine however why stress with BFO when you can get a PI machine and use it in wet condition unlike the BFO that gives a signal on wet grass.

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Offline wilTopic starter
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« Reply #2 on: February 15, 2010, 04:05:19 pm »
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Right Xavier, I built a PI detector, it is deep seeking, but it has no discrimination. i want to build a crystal controlled BFO circuit  I saw on the web. In addition, I am now discouraged because I found out that in my State of Michigan, it is illegal to metal detect on public land. What a load of bull****!

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Offline xavier
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« Reply #3 on: February 15, 2010, 05:52:46 pm »
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Wil

A BFO only has a ferrous and non ferrous indication you have to decide to dig or not to dig what you want is a VLF but I would not use the discriminator let me tell you why see if you have a nice gold coin next to a pull tab and you have the discriminator on there are lots of chances that you will miss the gold coin also is you do not do the proper adjustments you will miss out on a lot of finds personally I'm against discriminators but that?s only my opinion as for not being permitted to hunt on public turf I do not see it as a problem I?m sure that there must be farms and plenty of private land that you could ask permission to hunt on.

Regards Xavier
PS can you post me the diagram of that BFO

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« Reply #4 on: February 15, 2010, 06:23:28 pm »
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I want to have a go at this one when I have more time then brains!

 Great

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http://freecircuitdiagram.com/2008/11/24/simple-metal-detector-circuit-beat-frequency-oscillator-bfo/


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Offline xavier
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« Reply #5 on: February 16, 2010, 02:25:59 am »
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Useless totally useless

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Offline wilTopic starter
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« Reply #6 on: February 18, 2010, 05:56:08 am »
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Xavier, the crystal BFO i wanted to build is an old design, the
 eti561, it is on the geotech website athttp://www.geotech1.com/cgi-bin/pages/common/index.pl?page=metdet&file=/projects/eti561/index.dat

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« Reply #7 on: February 18, 2010, 06:28:43 am »
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Thanks Wil

I?ll take a look at it and see if it's going to be any good for the kids in my area.

Regards Xavier

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« Reply #8 on: February 18, 2010, 08:25:47 am »
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OOOOOOOPS!

That was the one I ment to post.    Angry

Here is the schematic.

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http://www.kolumbus.fi/pami1/miscprojs/ETI561.pdf


Here is the Write UP!

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http://www.geotech1.com/pages/metdet/projects/eti561/eti561_300.pdf


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« Last Edit: February 18, 2010, 08:39:21 am by homefire »
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Offline xavier
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« Reply #9 on: February 19, 2010, 10:32:03 am »
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He he he glad to see that I'm not the only one to do that

Xavier

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