Malysh FM

[kt315]

i can show that with magnet on any sand - thats normal. you do something wrong. shield
a space inside box, around the pcb. connect the shield to the ground. both points of shileding must be in one point -
from coil and from housing to the batts clemma.

[ripsdevala]

Yes, i use malysh FM2 ver 2 with 2mh coil, eddy17 says maybe i have high mineral soil, all iron sand will pickup by a magnet, all my detector always beep on first contact with the soil.

[Toros]

You must comply that the author has two projects Malish FM and Malish FM 2. For each of the two projects is over, as the schemes and programs for the CPU changes were made.
Here are the latest two versions. Note that under Malish FM-ver2 coil is 1.5 mH, while the second version Malish FM2-ver2 coil is 2 mH.
In second new version (Malish FM2-ver2) the author has waived coil wound on the ferrite rod.

In the first two versions the inductance of the coils is as follows: Malish FM - 1.25 mH and Malish FM2 - 2,290 mH.
I hope that now becomes clear where it comes from frustration with inductance coils.

[ripsdevala]

ask http://www.geotech1.com/forums/member.php?5584-Eddy71

Thanks for the sugestion, already pm him.

[kt315]

What is the right coil spec 2mh, 1.5mh or 2.290mh?
I use 2mh for now

ask http://www.geotech1.com/forums/member.php?5584-Eddy71

[ripsdevala]

What is the right coil spec 2mh, 1.5mh or 2.290mh?
I use 2mh for now

[ripsdevala]

Not it is not!

I see ...poor me then

foil connected to ground? foil has a gap?

Yes it is, have a gap and connected to gnd, and im not sure about tuning 220k resistor, it doesnt change anything

[kt315]

Is malysh fm2 always give signal when close to soil/ground? Already wrap it with foil nothing change

foil connected to ground? foil has a gap?

[Toros]

Is malysh fm2 always give signal when close to soil/ground? Already wrap it with foil nothing change

Not it is not!

[ripsdevala]

Is malysh fm2 always give signal when close to soil/ground? Already wrap it with foil nothing change

[bernte_one]

this file contains nothing

but take this

[kt315]

anyone made it in full smd ?

http://www.md4u.ru/download/file.php?id=28863&sid=8ec8808540280e50f09060f50890889d

[Rom_1]

anyone made it in full smd ?

[ripsdevala]

Anyone get low sound issue? All is working

[nick holas]

thanks again kt315
i have pointed some mistakes on my pcb and overall it don t works so i m going to do another pcb with my modification just to see
thanks for the usefull link