Just few videos

[ivconic]

Good job, what voltage did you end up with on the UNO (-5 gnd )??????

Atmega328P is supplied normally with +5v.
Impulses that coming from it are inverted.

[6666]

Atmega328P is supplied normally with +5v.
Impulses that coming from it are inverted.

Ok, I think you said you are using a 4053 for switching , maybe working a bit better then jfets

[ivconic]

Ok, I think you said you are using a 4053 for switching , maybe working a bit better then jfets

Yes i used 4053 on previous board.
On this latest one i am using 2N5484 fets.
I didn't even try to match those.
You see how it works on video.
I am focused on other things in this; switching will come last on my list.
It works close to perfect.
But if i put iron pliers through the coil (maximum signal); i am getting conversion at last opamp.
At this time i replaced TL072 with AD712.
Giving me pretty stable and linear output voltage from 1.5v to 4.2v.
When conversion occurs i get -3.6v there.
Recovering time is a bit too long, some 7-8 seconds if there is no new detection.
If there is new detection; it recovers much faster, under 1 second.
Or if "retune" button pressed it recovers immediately.
So right now i am focused on solving that.
Probably some compressing will solve it.
My final goal is not detector like it is in present state.
My final goal is to put all what's possible in digital domain.
That's why i don't waste time on solving things which are about to be extracted from the design later.
So... one step at the time...