Look this !!!!

[hooby life]

What about this derector ?
http://schema-montage-electronique.b...sible.html?m=1

[kt315]

read this
do not ask me why you must learn electronics base at first. believe me now every knowledge is better that nothing in your life.

[Carl-NC]

Appears to be a basic VLF ground reject design. No discrimination. Similar to a White's Coinmaster V Supreme, circa 1975.

[dbanner]

This is metal detector design from French Magazine Nuova elettronica issue #212

It is akin to the Whites 3900 design. Same sort of topology.

[kt315]

this is sort of non-motion - Magnum, ETI1500, yes 3900, one of modes of 5900 di pro sl, chinese MD-5006, 5008, 5012,
TF900, TM-808, TF600, TM800.
anyone can (CAN) open speccially site page done for them (for the beginners) and learn main principles.

https://www.geotech1.com/cgi-bin/pag...e=projects.dat

not so hard way to get new knowledge for a dummy.