Metal detector with double tone and reject discriminator- new schematic

[sinko1]

please upload pcb. Thank you

[peih]

Can someone help me with this scheme, PCB

[aft_72005]

aft_72005 now i am confused? Part of schematic you are posting now is not what i am confused about!
That oscillator is clear to me.
The other one part of schematic i posted twice (first Sascho's and second with my wrong corrections) is what i wanted to clear up.
Regards!

Ivconic, ok I understand . but I believe sascho designs are correct .
May be need some fine setting at practice .
But strange , we cannot meet sascho here ?
Best regards.

[ivconic]

Where did that schematic come from?

Ivconic: 100 pF is nothing, and not meant to send signal anywhere, but rather to cancel stray capacitance from sloppy wound coil imo. It seems that Sasho has not been around for a while. You could make circuit board to go both ways to see which one works best. I think Sasho's design has been tried and works.

Thanks Technos!

[ivconic]

ivconic ,if I remember correct, also one of the fisher detectors used similar
Oscillator

aft_72005 now i am confused? Part of schematic you are posting now is not what i am confused about!
That oscillator is clear to me.
The other one part of schematic i posted twice (first Sascho's and second with my wrong corrections) is what i wanted to clear up.
Regards!

[Magma]

I'm not sure, some Russian detector.

[aft_72005]

ivconic ,if I remember correct, also one of the fisher detectors used similar
Oscillator

[aft_72005]

I agree. Best way to figure it out!

Hi ivconic
I built this oscillator , working correct without problems .also has very good
Stability .

[aft_72005]

A similar oscillator:

Simulated this oscillator with proteus software . worked correct.

[technos]

A similar oscillator:

Where did that schematic come from?

Ivconic: 100 pF is nothing, and not meant to send signal anywhere, but rather to cancel stray capacitance from sloppy wound coil imo. It seems that Sasho has not been around for a while. You could make circuit board to go both ways to see which one works best. I think Sasho's design has been tried and works.

[ivconic]

You can make only Tx generator and L1 and see if it work.

I agree. Best way to figure it out!

[Pompey]

Yes i see. Maybe i am wrong, but i also can not figure out the first case?
Would be best to hear from Sasho.
Ahhh it is that awkward way to draw schematics..!

You can make only Tx generator and L1 and see if it work.

[ivconic]

In this way isn`t base of tranzistor shorted to "-" ? Is this correct? Both base and emiter goes to minus . Base via L1 .

Yes i see. Maybe i am wrong, but i also can not figure out the first case?
Would be best to hear from Sasho.
Ahhh it is that awkward way to draw schematics..!

[Magma]

A similar oscillator:

[Pompey]

In this way isn`t base of tranzistor shorted to "-" ? Is this correct? Both base and emiter goes to minus . Base via L1 .