mineoro special serie 2000

[brasilpb]

[Geo]

Nice try but afraid that there are errors especial at Rx input.

[brasilpb]

yes, it is my doubt also, the coil connected in the transistor collector, and has no current at the base.

[fmnotes]

Originally Posted by brasilpb

What model is it?
What ic uses?

[brasilpb]

TBA820I

tda7000

[aft_72005]

Hi brasilpb
nice work !!!!.
can you upload PCB pictures ?

[aft_72005]

Originally Posted by brasilpb

yes, it is my doubt also, the coil connected in the transistor collector, and has no current at the base.

it is similar to regenerative mode circuit.

[brasilpb]

[aft_72005]

thank you for pictures . but if you want help for reverse engineering, Not enough.
other thing , is mineoro 2000 really worked ?

[brasilpb]

only works up close, I had to make another receiver to the receiving coil, so it must have something wrong in regenerative receiver, lack of DC voltage at the base of the first BC548.

[Geo]

Short the capacitor 290p and try again..

[enjoykin4]

BrasilPb hello

Particullary mineoro special serie 2000 it is a kind of "Static Scalar Detector" - very similar to Signore Franco design.

Can you show us "Bobina receptora" - input coil, and give us some data about, how to wind it. (diameter of wire, number of turns, diameter of windings etc.) ??

Ceramic capacitor of 290pF should be connected in parallel to variabile potentiometer (multyturn) for fine trimming of phase and bias amplitude of oscillating stage T1-BC648.

I don't only understand the role of fixd NF-oscillator 730KHZ in amplitude detector and preamplifier stage.

Reg.
Enjoykin4

[Geo]

Originally Posted by enjoykin4

BrasilPb hello

Particullary mineoro special serie 2000 it is a kind of "Static Scalar Detector" - very similar to Signore Franco design.

Can you show us "Bobina receptora" - input coil, and give us some data about, how to wind it. (diameter of wire, number of turns, diameter of windings etc.) ??

Ceramic capacitor of 290pF should be connected in parallel to variabile potentiometer (multyturn) for fine trimming of phase and bias amplitude of oscillating stage T1-BC648.

I don't only understand the role of fixd NF-oscillator 730KHZ in amplitude detector and preamplifier stage.

Reg.
Enjoykin4

i think it is 130khz...

[Geo]

For all...
Look carefully the audio stages.
They have very interest.

[enjoykin4]

Originally Posted by Geo

i think it is 130khz...

Geo any info about 130 KHZ NF frequency ??

Why not 64KHZ or 35KHZ or similar ?? Have you any idea about NF mixing frequency and audio stages ??

Regards
Enjoykin4

[Geo]

Mineoro (Alonso) plays often with frequencies.
Maybe they are looking for frequencies where the noise background is lower....

[Geo]

Nobody not interesting about this strange audio stage;

[WM6]

Only vacuum tube is missing in those audio.

[Geo]

Hahaha.... NO.
Mineoro here try to cutch very "thin" signals.....
It is another "philosophy"....

[Geo]

Any news from brasilpb???
Did you made mod at oscillator???

[brasilpb]

I spoke to the man who sent me the circuit. And he told me, there were two coil in the oscillator circuit. The other coil terminal I connected the collector and the other for the 22k resistor and the oscillator oscillated.

[brasilpb]

[Geo]

Thank you.
Do you know the frequency of this oscillator????
I try to understand the usefully of the 130Khz oscillator.

Regards

[brasilpb]

Yes the oscillator, also functions in 130khz. The circuit is type one bfo, metals of close it detect, and the stage of fm functions in 120MHZ.

[Geo]

Ohh yes, very good... a classic Alonso's schematic.
So coil stimulator(555) is for the Rf sniffer!!!

Now all are clean!!!

Thank you.
Regards