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Offline mdiede57Topic starter
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« on: September 29, 2009, 11:48:51 am »
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I found this link for a simple detector

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http://www.kolumbus.fi/pami1/miscprojs/metaldet.html


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Offline Homefire
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« Reply #1 on: September 29, 2009, 12:56:52 pm »
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Ive seen this one before.

Its posted else ware on the forum under BFO I think.

Some day I will build one.

Might make a cool little pin pointer. Wise

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« Reply #2 on: September 30, 2009, 07:04:09 am »
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if you don't have the protel easyedit program, what else can you use to view the pcb to print it out. I would like to give this design a go and make it into a pinpointer, as I have been looking everywhere and doing everyting to make or get one. thanks.

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« Reply #3 on: September 30, 2009, 08:36:17 am »
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I don't know!

Stip Board would be handy on this on.

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Offline mdiede57Topic starter
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« Reply #4 on: September 30, 2009, 01:49:00 pm »
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File Ext shows ACCEL or Protel Printed Circuit Board File,  if you find the right software, let me know

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« Reply #5 on: October 01, 2009, 03:23:42 am »
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Quote:Posted by bountyhunter
if you don't have the protel easyedit program, what else can you use to view the pcb to print it out. I would like to give this design a go and make it into a pinpointer, as I have been looking everywhere and doing everyting to make or get one. thanks.


Take a look at the one I posted using an untuned coil and an LM565 IC, you might find it by searching for the word Kraus. I put up the original circuit drawing and my additions in another drawing, plus a .txt file of parts for my version.

It is the simplest I ever saw, and is a phase detector, not BFO as the originator listed it, in an old article in Pop-Tronics.

goldigger

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Offline mdiede57Topic starter
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« Reply #6 on: October 02, 2009, 01:51:56 am »
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goldigger,

I searched, and was unable to locate your refered to plans.
Can you post them here again, please ?

Thanks

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« Reply #7 on: October 02, 2009, 08:56:34 am »
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Here is a few more for the mix.

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http://dearcomputer.nl/gir/?q=metal+detector+circuits&s=4&imgtype=any


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Offline goldigger
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« Reply #8 on: October 03, 2009, 01:14:25 am »
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Quote:Posted by mdiede57
goldigger,

I searched, and was unable to locate your refered to plans.
Can you post them here again, please ?

Thanks


Yup! I seem to have gotten two .txt,s and only one iis the correct one but I can not find how to remove stuff once on the system to uploaded.... Goldigger1950 says there is a delete button but not on my end!  Violent

Anyway, this jpeg is of an improved version of the original article, it has a diode bridge to insure the meter and piezo beeper get the proper polarity voltage.... unfortunately, I can not find the original article text, but it is simple... the coil provides a phase change which the PLL tracks and gives a voltage change as indication. The voltage is fed to one transistor and a *reference voltage*, that is stable, to the other transistor... this forms a bridge across which the meter and the piezo are connected.  Wise

If I uploaded  the wrong txt.... guess I will have to fix it.  Funny

goldigger

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There are 3 attachment(s) in this post which you can not view or download

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KrausDetAlrm.txt
phaseBFO.jpg
phaseBFO.txt

« Last Edit: October 03, 2009, 01:27:45 am by goldigger » 		Logged
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Offline goldigger
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« Reply #9 on: October 03, 2009, 01:35:48 am »
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Quote:Posted by homefire
Here is a few more for the mix.

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homefire;

Some of those are not so simple and others are repeated several times, but I made a PDF of the whole bunch.... 2.5 mbytes! I will look at them off the forum.

goldigger

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