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Offline Get TechnicalTopic starter
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« on: December 04, 2020, 12:15:37 pm »
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I can now detect a penny [air testing] at 7.5 inches with a gain [sensitivity setting of 9]  There was no advantage of moving it up to 11 or twelve.  The same result happens using a dime.  After using it in the field a few days ago, I have decided that my settings will now be notch and nine for gain.  I plan to notch out only the soda cap.  If I get the middle tone on those lower icons, whatever is buried needs to be investigated.

I changed R49 to 850K.  In hindsight, it would have been better to have used 900K.  I changed R50 to 201 ohms (measured with Heath IM-2215).  I also "in-circuit" bridged resistor with my schematic I.D. ER-1, but in the end I did not change the value of that emitter resistor.  You will note that all original resistors installed have covered the board printing.   Resistor values were determined by bridging the resistors with my Eico Model 1140, then removing and measuring the both of them while in parallel.  Individually, they all produced a change in sensitivity with "in-circuit" bridging.

My other two detectors cannot compete with this one.  I worked with the other GC and the Bounty Hunter using the same method, but there wasn't enough gain to warrant making changes.

Well, I guess I am unable to upload my diagram and photos.  I would need help with that since all I get is an error.

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Offline GoldDigger1950
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« Reply #1 on: December 07, 2020, 10:37:09 am »
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Welcome! You'll be able to do all a forum functions once you have 15 posts, which allows full membership. Patience, Grasshopper, this is a fascinating and friendly place. You will gain full access very soon. Then, you can upload pictures, download full datasheets and all manner of sexy things.

Yours is an interesting post. You would do well to take some time and introduce yourself. You know, let us know where you are living, where and what you like to search for and your favorite equipment to use.

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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.
Let's Talk Treasure!

Offline Get TechnicalTopic starter
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« Reply #2 on: December 07, 2020, 01:27:28 pm »
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Oops, I pulled out to check something and lost what I put in here.  Yeah, I discovered that my files were way too large anyway.  So, I forged ahead and did some videos which are posted on You Tube, but they haven't been through video editing.  I never knew how to do it.  My neighbor came over and helped me, but I still cannot take out pieces I don't want in there.  I did remember how to get the videos into the story board.    He let me use his Go Pro that he wasn't using.  What a camera that is!  I have the videos in the story board and that is as far as I can function.

I'm eighty years old and live in Ashland, Maine

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