TDI project

[usefi5961]

Hello everyone:I am looking for schematic of TDI metal detector.
does anyone have schematic and DD coil information of white's TDI metal detector?
Thanks

[kt315]

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[usefi5961]

Hi kt315,Thank you very much for reply,does a information about making DD search coils?and does a schematic is correct ?do you have pcb file?schematic is very close to gs4.4 sample .
thanks.

[kt315]

hello amigo
this is a product by Eric Foster and Carl. because you see a convergence to GS4. but my word here is last so let Carl to tell you more.

[Carl-NC]

GS4 --> GS5 --> TDI --> TDI-SL

I did the TDI-SL, not the TDI. They are all very similar.

[usefi5961]

Thanks,dear Carl,do you have schematic and DD coil instruction?do you doing reverse engineering this detector?

[Carl-NC]

The schematic kt315 posted looks correct. For the DD coil I would use

TX = 300uH 2Ω
RX = 300uH 2Ω-10Ω

[usefi5961]

The schematic kt315 posted looks correct. For the DD coil I would use

TX = 300uH 2Ω
RX = 300uH 2Ω-10Ω

Thank you very much

[Detectorist#1]

Hi usefi5961,
The schematic from 2024 is more close to the true original than the schematic from 2017. The wrong connection of the diode connected to GND after C32 continue to exist but some other mistakes are corrected. As Carl say, this project is old and use some very expensive integral circuits and resistors in TO-220 case. But if your goal is to repeat the original schematic as close as possible, go ahead! The love haven't price!

[usefi5961]

Hi usefi5961,
The schematic from 2024 is more close to the true original than the schematic from 2017. The wrong connection of the diode connected to GND after C32 continue to exist but some other mistakes are corrected. As Carl say, this project is old and use some very expensive integral circuits and resistors in TO-220 case. But if your goal is to repeat the original schematic as close as possible, go ahead! The love haven't price!

Thank you very much detectorist :
can you please share original 2017 schematic to compare ?

[GeoMax]

Hi usefi5961,

check out post #2 by kt315.

[usefi5961]

Hi usefi5961,

check out post #2 by kt315.

Thank you very much geo Max.