FGM-3 Sensor

[chamee25]

If you have any details fgm-3 sensor please post here.

[chamee25]

[Zibanaseri]

Q1+q2?

[kt315]

price of two transistors - cents.
price of Mu metal - gold.

is it CLEAR for you there?

[pustareka]

https://www.ebay.com/sch/i.html?_fro...0%B9&_osacat=0

[j570]

I found full schematic. I don't tested it.

[MDfanatic]

What are the values of L3 & L4? That's the most difficult part to figure out (and how to bind the metal sheet), the rest is easy.
If someone had a sensor that wasn't working and was willing to tear it down it would be most helpful.

[kt315]

Thousands of very thin wire. they never will do the L. no direct hands.

[pustareka]

[kt315]

[ivconic]

New store, branded. And from now on it will be the official store.

https://vi.aliexpress.com/store/1104...bestmatch_sort

[Simon481]

inside of FGM 3h

[ivconic]

Fun!
Some years ago I wanted to check the very "fat" claims of one of the "manufacturers" of (very bad) copies of those sensors.
Because in the advertisements it aggressively advertises that its sensors have additional "special" circuits for stabilization... whatnot... blah blah blah...
I have too much stock of ferric chloride in the basement and of course I always have extra time.
Not only did I not see any "improvements" in those sensors; but I also saw something of "regression" in them! LOL
I "opened" one such sensor and had something to see inside: (click to enlarge)

[nejdet]

For those who want to try making such a sensor! Mu-metal can be found in crt- tape wrapped around crt.