IDX-PRO+VDI

[Orbit]

The small pcb was taken off the idx that Bill mod finished, it's actually the pump charging schematic, and last time I did the idx was a 00 coil and the number of turns was tx 45 with rx 140, range in air 50cm.

[Orbit]

Драги Едуардо,
да ли се сећаш величине и врсте новчића који користиш у видеу?
И која је то удаљеност?

Either you don't know how to adjust the timing potentiometer, or it seems you don't know how to wind the coil; the one I built—I don't recall if it was 27 cm or 32 cm—had a range of 45–50 cm in an air test. Conditions in the field are different, of course! But if the device picks up the metal well and you watch the LCD screen, it performs quite solidly... And did you move the filter capacitors (located after the 100k resistor) to ground? If you stick to the factory schematic, those capacitors at the output of the CD4066 chip drastically reduce detection depth!

[pechkata]

Dear eduardo
Do you remember the size and type of coin that you are using in the video?
And what distance?

Buy yourself an antenna – just like Eduardo's.

[Carl-NC]

I made a coil with 0.65mm for TX and 0.15 for RX.

But i can not reach to a sensitivity of video in post #4359.
Mr. eduardo1979 measured his coil ( black max) ohm as follows:
TX :1.7
RX :90.4

And mine is
TX:3.5
RX: 166

The RX resistance matters very little. The higher TX resistance will add a small amount of phase rotation that is removed with the ground calibration. The resistances you have will work, and are not the cause of your lower sensitivity.

[eduardo1979]

Dear eduardo
Do you remember the size and type of coin that you are using in the video?
And what distance?

I recorded the video 16 years ago, but I still remember that the coin was a 50 cent coin and I detected it 40 cm in the air.

[h9361]

TX=0.58uH+1uF
RX=34uH+33nF

Dear eduardo
Do you remember the size and type of coin that you are using in the video?
And what distance?

[h9361]

I don't know the original values. The RX coil is not critical, 0.2mm would be fine. For the TX coil 0.5-0.6mm should work.

I made a coil with 0.65mm for TX and 0.15 for RX.

But i can not reach to a sensitivity of video in post #4359.
Mr. eduardo1979 measured his coil ( black max) ohm as follows:
TX :1.7
RX :90.4

And mine is
TX:3.5
RX: 166

[Carl-NC]

I don't know the original values. The RX coil is not critical, 0.2mm would be fine. For the TX coil 0.5-0.6mm should work.

[h9361]

Those values sound about right.

Some say that TX must be 0.6mm to 0.7mm and RX 0.15 to 0.25
But other say that White used 0.45 or 0.5mm for TX and 0.2 or 0.25 for RX
Which of them is White original?

[Carl-NC]

Those values sound about right.

[h9361]

Usually a charge pump is not a very good choice for the TX power supply, try adding a load and see what happens.

The White's V3 had a "transmit boost" option, which increased VTX from 10V to 30V. It added only 2-3cm of depth on typical coins. As you increase the TX field strength (using any method) the IB null becomes more critical, otherwise you will likely overload the preamp.

Dear Carl
I searched more about the black max 950 Pro ( white coil).
Some measured its TX and RX different from 0.58uH and 34mH.
Do you know exact values?

[h9361]

TX=0.58uH+1uF
RX=34uH+33nF

Thanks.
34uH or 34mH?
Do you think TX wire is 0.6-0.7mm and RX is 0.1- 0.2mm?
Do you remember Ohm of TX?

[eduardo1979]

Hello
Dear eduardo
Do you remember TX and RX inductance of the coil that you are using in the video?

TX=0.58uH+1uF
RX=34uH+33nF

[h9361]

My IDX-PRO 2 TONES.
http://www.youtube.com/watch?v=lyg_Di3kcvU

Hello
Dear eduardo
Do you remember TX and RX inductance of the coil that you are using in the video?

[pechkata]

increase L2, reduce C2