“S”- tone discriminate metal detector.

[Unregistered]

Resistor R 24 replacement only for first variant.
This is second ,BEST VARIANT schematic-free of mistake, work perfect.

Sascho

[rdec4]

What is the function of "r2", "r3" and "r4"?

SASCHO please explain them.

Best regards.

[Unregistered]

r1-referent phase
r2-ic C pin1- offset amplifier toward +8v adjust.
r3-icC pin7- offset amplifier 0v=u/2
r4-audio frequency
Sascho

[sascho/bg]

R24-Motion speed.
sascho/bg

[Sascho-bg]

With DD coil this schematic work also very well .

[ivconic]

Sasho this schematic looks pretty interesting. I am very ready to draw pcb for it and make device. Can you help here and explain those few asteriks over some components?
Also one more question; R49 100K is "Tune", right? Tune what?
Further.. are the TL062's really best choice there?
I will start drawing pcb these days. To many other things to do, so i will go slow on this.
Regards!

P.S.
Sasho where are You from? I know only that you are from Bulgaria, but which place? I would like to email you some other questions, can you send me your email address?
ivconic@gmail.com

[Patrick]

Not tested


Sascho S1.zip

[ivconic]

Thanks Patrick!
Nice pcb.

[Sascho-bg]

R49 100K IS Tune.
R24=150k-big depth.
Tl062-no problem.
S-coplanar coil-
http://bgcenter.net/users/copl..JPG

[aft_72005]

R49 100K IS Tune.
R24=150k-big depth.
Tl062-no problem.
S-coplanar coil-
http://bgcenter.net/users/copl..JPG

Hi to all.

[aft_72005]

With DD coil this schematic work also very well .

Hi Sascho
Please explain about DD coil.
Best regards.

[Sascho/bg]

DD coil
26cm diameter
L1=L2=100 turns.

[aft_72005]

Thank you Sascho, and what is wire diameter ?

[Sascho/bg]

0.31mm

[aft_72005]

Sascho ,
I am busy constructing your best VLF detector .( with two 4007 ) .
I built full resonance vlf detector many years ago .it is based on elector
Magazine VLF detector and modified by me. I decided again experiment
full resonance detector . I need VLF dipper detector.
Also your “S “detector interesting .