Selection of the TX cascade driver

[Marchel]

And you didn't measure the parameters of the RX and TX coils?

Yes, I have measured all the coil parameters and signal waveforms on the ADC and TX.

[JoyJo]

And you didn't measure the parameters of the RX and TX coils?

[Marchel]

Aren't the resistors shunted by diodes?

No there are no diodes there are only resistors that go directly to the GPIO. In Deuse 1 X35 coils only 10pf capacitors are added after the resistors.

[JoyJo]

Why complicate it, the XP Deus FMF coil has an H-Bridge connected via 10R resistors directly to the GPIO on the processor and the detector works great.

Aren't the resistors shunted by diodes?

[Marchel]

Is the supply voltage of the full bridge adjustable? Or in deus, the value of the current in the TC coil changes by adjusting the duty rod of the control signals: pwm?

The H-Bridge is permanently powered by 3.3V and everything is controlled by PWM. Watch this video to see the signal flow.

https://www.youtube.com/watch?v=E2AYJp2uH2U&t=437s

[JoyJo]

XP Deus 1 or 2 do not measure TX coil current.

Is the supply voltage of the full bridge adjustable? Or in deus, the value of the current in the TC coil changes by adjusting the duty rod of the control signals: pwm?

[JoyJo]

or this - simple

Judging by the two rows of landing holes, the board is adapted for the use of a ready-made module with a microcontroller. The tracing of these modules is far from ideal. Is it possible to see the diagram of the device whose boards you demonstrated?

[JoyJo]

Oh, they use a full bridge on n/p MOSFETs. The use of only n channel MOSFETs would make it even more economical. But it doesn't matter. Thank you for the information. And do you have any data on the coil Rx and Tx: inductance, resistance, wire diameter. Th, it will most likely be wrapped in litzendrate.

[pito]

PCB to show how simple it all is.

or this - simple

[Marchel]

Here are XP Deus FMF photos of the PCB to show how simple it all is.

https://device.report/m/a47bb465c23579b0e52dda0f1c8bf25eb31f57ebeed491ecf12bfdddf9461459

[Marchel]

And in dues with a full bridge, is the current phase measured in the TX coil? In Equinox, one channel of an external two-channel ADC is allocated for these purposes.

XP Deus 1 or 2 do not measure TX coil current.

[Marchel]

I only saw the deus board in the photo, but I couldn't see the MOSFET brand. Do you have a MOSFET marking from deus? Maybe they use drmos?

I tested these transistors and everything worked fine.

https://www.ti.com/lit/ds/symlink/csd16327q3.pdf?ts=1757583218840

https://www.ti.com/lit/ds/symlink/csd25404q3.pdf?ts=1757609949156

[JoyJo]

Hi JoyJo,
The MOSFETs haves Gates, Sources and Drains. Which is the "shutter" end, maybe the Gate? With these type of drivers is not possible to connect second end of the TX coil to GND. Lower MOSFET, when is open, will shunt the TX coil.

I completely forgot to mention an important point. The electrolytic capacitor of 100-200 mkF will be included sequentially with the TX coil.

[JoyJo]

And in dues with a full bridge, is the current phase measured in the TX coil? In Equinox, one channel of an external two-channel ADC is allocated for these purposes.

[JoyJo]

I only saw the deus board in the photo, but I couldn't see the MOSFET brand. Do you have a MOSFET marking from deus? Maybe they use drmos?