2 boxxxx :)

[chafik]

my idea for this circuit for best stability is to add feedback resistor between two amplifiers stage

[scs]

2 box home made detector-The best to the best!Easy made and maximal depth.

[mikebg]

2 box home made detector-The best to the best!Easy made and maximal depth.

SCS, if you think that this is "the best to the best!" home made detector, you are very mistaken.
The circuit operation can be improved significantly with very simple changes to the TX circuit and coil orientation.
Even the drawing of circuit diagram can facilitate and improve its readability when introducing ground simbol and simbols for supply rails. I wonder why Sascho drew his circuits like he not seen how other circuits are drawn.

Do you know for what is connected diode D3? I know, but even this simple circuit speaks enough for its author.
He did not even know that Varna and Bulgaria should be written with a capital letter.

[Davor]

scs IS Sascho

I like Sascho's designs very much. There may be some things I'd do differently, but that's because we are not the same person, and we have our preferences. Sascho is surely one of the few designers who knows his art very well. Maybe his command of English is not perfect, but his designs mostly are.

BTW, a better choice for a D3 would be 1N914 with ~5uA leakage current ... 1N4148 is "too good" for this purpose.

[scs]

D3 is to prevent the measuring system.Мade 0.7v limited maximum voltage.Mistake in the drawing scheme.I wait for a better scheme of mikebg...
...

[mikebg]

scs IS Sascho
I like Sascho's designs very much. There may be some things I'd do differently, but that's because we are not the same person, and we have our preferences. Sascho is surely one of the few designers who knows his art very well. Maybe his command of English is not perfect, but his designs mostly are.
BTW, a better choice for a D3 would be 1N914 with ~5uA leakage current ... 1N4148 is "too good" for this purpose.

This is known since July 2012. He is in thunting forum as "fff" since July 2009.
http://www.geotech1.com/forums/showt...8845#post78845
http://www.thunting.com/smf/pi_desig...;msg140232#msg140232
http://www.geotech1.com/forums/showt...328#post159328

I'm sure he does not see the drawbacks of his TX circuit and does not know how easy it is to improve the operation of
orthogonal loops system. All this is described in the forum.
For TX:
http://www.geotech1.com/forums/showt...772#post152772

For orthogonal loops system:
http://www.geotech1.com/forums/showt...820#post103820
http://www.geotech1.com/forums/showt...sed-to-them&p=154818#post154818

Sascho had almost 4 years time to read postings in forums and to educate himself. Note that he does not even want to
use any software (Machine Translator) to prepare perfect text. This will take only a minute.

As far as the limiter of meter, a resistor should be connected to adjust the maximal divergence of the arrow. Leakage current of D3 is not important because he uses germanium diodes as D1 and D2.

[mikebg]

I wait for a better scheme of mikebg....

Here's the improvement of coil system and explanation of how to set screws for coils:
1. Place the machine on the ground.
2. Set the RX coil lying close to the ground.
3. Lift and adjust the TX coil for induction balance.
4. Repeat 1, 2 and 3.

[scs]

Thank,GREAT Theoretical!In practical 0.25ma meter resist is 1Kom.In 0.5-07 volt meter overload is low.If is resistor for adjust maximum level problem is low level signal when adjust coil position.My schematic have phase detector and ground effect is not problem.Your picture is valid for primitive high frequency detectors.
I wait for a better SCHEME of mikebg,NOT for picture.

[scs]

To makebg
P.S.-Your hobby is just to write? Invent anything?

[mikebg]

To makebg
P.S.-Your hobby is just to write? Invent anything?

Not, my hobby is to read a lot before to write or before to design . Notable are authors who have written a lot more than they read, so the written by them sucks.
Thanks to reading, I can find fault and errors in the writings of others. I have not invented anything, but if you have any idea what needs to be invented, let we know. There are many capable and educated people in this forum, who will probably figure out how to implement your idea. There are other forums that we can also engage with your ideas. Besides, I can use the brain potential of HamRadio brotherhood that can be mobilized for realization of your ideas.

[scs]

It's easy to only write without picked up soldering iron .And I do not live in the forest,i know law of OHM.

[mikebg]

IMPROVEMENT OF OHM'S LAW

It's easy to only write without picked up soldering iron .And I do not live in the forest,i know law of OHM.

I made some improvements in "Ohm's law".

[scs]

Bravo, you're great!

[scs]

Bravo, you are a GREAT!!!Very GREAT!!!Very GREAT!!!Very GREAT!!!Congratulation!!!

[scs]

Scs make new detector schematic.