XP Deus 2 Transmit frequencies

[Mark-VA]

There will be no laughter on my side

[Marchel]

I haven't found any photos of the open coil for the XP Deus 2 anywhere yet, but I'm sure that the new Deus uses STM32 instead of PIC24 processors. I will finish the last version of the PCB and create a new thread for my project and hopefully together we will work towards the first freely available multi-frequency metal detector :-)

[Riss]

And I really like a series resistor 0.05 to no more than 0.33 ohms to see the current. I will take the pictures of the "field meter" soon. but don't laugh at my design... Mark-VA - now it's sunrise for me, the air is scented with linden trees , I have a lot of tasks waiting for me. I will take the pictures in a few days

[Mark-VA]

yes, please post

[Altra]

Yes I understand the closed loop current transformer. I normally use a series resistor with the tx coil to monitor the current. The op amp c to v circuit is good for testing when you cannot insert a xformer or resistor. Post some pictures of your sensors,

[Riss]

Hi Riss, I think you are confused. This is a non contact, transformer-less oscilloscope probe. It's for relative visualization of the coil current. Carl posted the idea above, which I have never seen before. Maybe he can explain it. All I know is it works!

Hi Altra , I understood , that you are confused that I am confused .I know the scheme Current probe sch.pdf from kindergarten 2 years ago I made a "field meter", it has several sizes of "voltage" coils and one "current" one - a coil of 4 mm copper wire closed through 1 winding of the primary winding on current transformer( isn't it the same ? – a closed current loop of 4 mm copper wire passed through a toroid -White's TM808 Euro) if anyone is interested, I will take pictures of the circuit, coils, appearance. It is primitive, but it works for me to measure the energy and field configuration in the near and far zone (more than 1 meter).

[Skippy]

If you were wanting to dispense with the opamp I-to-V converter, and just 'near-short' the coil, I suggest a 'load' resistor for current sensing that has a resistance 1/3rd (one third) that of the pickup coil.
And yes, Altra, the ToneOhm is a good tool, I have one .. I haven't used it in a while, though.

[Skippy]

I agree, Marchel needs his own thread dedicated to his own project ....
For interest, the FMF coils have already been opened up, the board is near identical to the HF coils for the Deus1. My guess is XP were developing the D2 coils, and realised they could make a dedicated single-frequency version that's D1 compatible - and the HF was 'born'.

[Altra]

My project is based on the STM32H7 processor and, unlike the XP Deus, does not have an external ADC but uses an internal 16bit ADC. Here are my final PCBs which still contain small errors. I am testing the project on the original coil X35 22cm, if anyone is interested in working together on this project, we can create a special contribution on this forum.

Marchel, I remember this project, you should start a new thread. I am sure some would be interested.

[Altra]

Thanks Skippy. Years ago I owned an apparatus called a "Tone Ohm". It was used to find short circuited parts or traces on pcb's. Basically it used a low voltage pulsed constant current signal connected to the power rails. Then with an inductive probe it could sense the lowest resistance/highest current spot on the pcb.

[Skippy]

Quote:".... the idea above, which I have never seen before."
The idea is you apply a short-circuit, or near short-circuit to the coil. Then the current flow is purely dependant on the inductor, in theory. In practice, the L has some series resistance, so this needs to be kept low. And in practice, you would need a low value physical resistor as a load, so you had something to measure the voltage across. If youkeep the load resistor low in value, the generated voltage will be small, which is not ideal.
The opamp-based current-to-voltage converter circuit provides a virtual short-circuit to ground, but because it has an independant feedback resistor of its own, it can have any gain ( current-to-voltage ) you like.

[Altra]

Hi Riss, I think you are confused. This is a non contact, transformer-less oscilloscope probe. It's for relative visualization of the coil current. Carl posted the idea above, which I have never seen before. Maybe he can explain it. All I know is it works!

[Riss]

both types of op-amps need a load resistance greater than 600 ohms -NE5532 - , respectively 2 kilohms - TL072. choke in the picture from 06-14-2024, 07:58 PM #8 , wound on a toroid - the thick copper wire ( closed loop ) through the choke ...

[Mark-VA]

Care to elaborate please

[Riss]

I wired up one yesterday. It works well for a first try. I tried a TL072 and NE5532 both worked. The NE5532 seemed to be cleaner. The pickup coil is 520uh, 1 ohm. This is a nice tool for the work bench.

Equinox 800 tx current in park mode. I also tried the prospecting mode 40khz and was able to see the saw tooth current wave.







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I look at the diagram Current probe sch.pdf - maybe someone did not bother to review the pdf files of the TL072 and
NE5532. a closed current loop of thick copper wire and a step-up transformer?