New Idea

Hi Golddustcarl

Been scratching around in the parts box looking for some bits but will have to hit the hobby shop.

With the 2 1n4148's have you experimented with fast recovery diodes to see if they work any better ?

Your kit idea sound interesting to, with that 220uF cap on the fet, I would be a bit inclined to make that a low esr type of cap about 4700uF .
Could you please tell me the number of the meter fet its a bit blurry when zoomed in, does it have to be a bulky fet for only 1 ma ? thanks.

6666

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Hi Golddustcarl

Thank you for sharing your very interesting and inventive approach to PI design.

Wish you all success with further improvement. Also interested in (semi)kit if you decided to offer something like that later.

You gave us schematic to try with it, but it is in low resolution and partially unreadable. Can you post it in higher resolution, please? Thank you!

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		Quote:			Posted by {author}
	I came across a nice  brilliant new  little piece of  info on auto ground bal .

That sounds interesting jonny23

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Hi Johnny

You are quite right about going back to older designs and improving them with new technology just look at the radio how it has changed over the years. Thanks for posting the article,  I took the liberty of removing the double.


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Xavier

Hi wm6  
 I just posted the final circuit because it was the  result of going through all the possible  circuit configurations  and realizing the  best  possible input signal the circuit adjusts and balances itself relative  to the ground conditions rather than trying to stay balanced on  a fixed ref. freq. because of the way the  search coil is tapped in between the caps where I have highlighted in the schematic image. the frequency can stay "balanced"  due to Ground conditions charging and discharging the "tapped" caps, equally  then  when it hits an anomaly you get a very  discrete signal due to the inductive nature of the anomaly, that you are looking for. sorry I should have copied the entire article but  this was the relevant info to me  and this is the best description i can explain of the top of my head, cheers  Johnny    

Posted on: May 20, 2014, 10:31:54 am

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thanx xavier  sometimes things are slow to load and I hit resend thinking nothing is happening 

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