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Offline maher471Topic starter
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« on: January 11, 2012, 09:51:19 am »
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Hi,
i have found the schematic for GD348 Heathkit

The GD-348 was an excellent detector: good sensitivity to tiniest targets 70cm, good iron rejection

Posted on: January 11, 2012, 08:59:35 AM
I have found some tips for Increasing sensitivity of the GD-48 at this link:

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http://www.geotech1.com/forums/showthread.php?p=142443


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Some improuvement from Heatkit Lab.txt

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Offline Homefire
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« Reply #1 on: January 11, 2012, 10:46:13 am »
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Cool ol machine for sure.

Not much info on the coil.

I would rather have a shot building the TGSL. Cool

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Offline xavier
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« Reply #2 on: January 11, 2012, 01:44:18 pm »
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I did not have a look at it yet but if it's an LC circuit having C you can workout L so that should not be too hard to do for a chap like you.Ho but you do have to know what the frequency is.



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Offline Homefire
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« Reply #3 on: January 11, 2012, 02:16:42 pm »
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4.5Khz as per the link.

I'm looking for something 15Khz and above.

Think I may try to mod the IGSL.

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Offline xavier
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« Reply #4 on: January 11, 2012, 04:07:30 pm »
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I have just the thing for you but you must give me a few days for me to prove that it's working (Again) only thing is that I'm on 16Khz. I don't know if you can remember but I was working on this project about 2 1/2 years ago. It,s quite a simple build just the coil that's a bugger depth that I was getting on my prototype was 250mm for a small sinker. The objective was to find non ferrous metals so I used lead sinkers for all my testing I guess that it would be good for gold too . Why I say that I have to prove that it's working is that I lost the original design so I had to re-do it. If I got it right you could build it in one day but the coil will take you three.

All the best Xavier

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Offline Homefire
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« Reply #5 on: January 11, 2012, 04:35:21 pm »
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Cranking up the Freq on the TGSL is no problems.   It runs at 14.6 as is.

If I doubled that, I would have to do something about the Audio tone.

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Offline maher471Topic starter
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« Reply #6 on: January 11, 2012, 05:07:33 pm »
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some others details for Coil

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« Last Edit: January 11, 2012, 05:29:45 pm by maher471 » 		Logged
Offline Homefire
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« Reply #7 on: January 11, 2012, 05:25:48 pm »
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Cool Beans!    Now someone would have a chance to complete one.    Thank You Sir!   Cool

Any more info would be cool too.

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Offline xavier
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« Reply #8 on: January 12, 2012, 02:20:41 am »
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I take it that the TX coil would be 20-22 cm

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Offline maher471Topic starter
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« Reply #9 on: January 12, 2012, 06:07:39 am »
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L/C Resonance Calculator :

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http://elvahost.com/~vcatbe/prospecting/tools/lc-calculator.html



Interwire Capacitance Calculator :

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http://elvahost.com/~vcatbe/prospecting/tools/interwire-coil-capacitance-calc.html


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