Serbian "Most Wanted"

[emoxristov]

My question was whether there are as pictured.BD136 -BD135 against each other

[ivconic]

My question was whether there are as pictured.BD136 -BD135 against each other

I understand now!
No, BD135 is turned wrong. Turn it for 180 degrees.
Emiter is going down to speaker.

[emoxristov]

Tell me analogue BD136 Can I get it replaced

[Toros]

Tell me analogue BD136 Can I get it replaced

BD140

[ivconic]

BD140

Yes.

[emoxristov]

Thank you very much colleagues

[zlatica]

Hello, my detector works, but I have problem with discrimination and geb. Disc on 1/3 rejects all metals, on 3/4 catch all metals. Geb not works. Where is the problem?

[ivconic]

Hello, my detector works, but I have problem with discrimination and geb. Disc on 1/3 rejects all metals, on 3/4 catch all metals. Geb not works. Where is the problem?

Coil specs?
Frequency?
Amplitude at TX out?

[zlatica]

Coil 27 cm, one D 255x137mm, Tx 75 turns 0.45mm, 5.3 ohms; Rx 175 turns 0.25mm, 39 ohms. Frequency on Tx 4 kHz, Ueff= 6V

[zlatica]

Coil specs?
Frequency?
Amplitude at TX out?

Coil 27 cm, one D 255x137mm, Tx 75 turns 0.45mm, 5.3 ohms; Rx 175 turns 0.25mm, 39 ohms. Frequency on Tx 4 kHz, Ueff= 6V

[ivconic]

Coil 27 cm, one D 255x137mm, Tx 75 turns 0.45mm, 5.3 ohms; Rx 175 turns 0.25mm, 39 ohms. Frequency on Tx 4 kHz, Ueff= 6V

TX cap? With such coil should be approx. 220nF.

[zlatica]

TX cap? With such coil should be approx. 220nF.

I put 470nf. Thanks, I'll try.

[ivconic]

I put 470nf. Thanks, I'll try.

470nF suits to coil with less inductance.
Try 220nF and i think it will work good.

[zlatica]

470nF suits to coil with less inductance.
Try 220nF and i think it will work good.

I tried with 220nF. Frequency is 6,4kHz, 14Vpp, but Fe isn't rejected on 3/4 discriminations. Gold ring 20mm catches on 25cm in air.

[Pompey]

Try to increase the frequency at least 7khz!