Signal synthesis for simple PI detector

[N@SKO]

I am trying to write code for bipolar TX with PPS frequency regulation. Can I use timer0 for 2 tasks? Somеthing like task1(TX-P) ISR task2(TX-N) ISR task1(TX-P) ISR task2(TX-N).......

[jafal]

...

Thanks a lot for you

[jafal]

Hi

Thanks for sharing your work

About post #51 May this helpful flip coil

https://hackaday.io/project/179588-pulse-induction-metal-detector/log/192567-modelling-the-flip-coil

[pito]

Almost done, PCB 80x40, and modified circuit.

[ivconic]

...

[pito]

post #34, SMD not ready yet

[jafal]

Hi

If you please can you post the PCB in jpeg or any other image format

Thanks in advance

[pito]

@Carl-NC
Thanks
Too many components there, I think circuit from post 51 will do the same job (probably better )

Discrimination next test; Iron/Aluminium

https://www.youtube.com/shorts/6T7HvS33yMc

[Carl-NC]

I've been looking at the White's AF108 solution, = do you have a schematic ?

https://www.geotech1.com/forums/filedata/fetch?id=411103&d=1680473512

[pito]

I will take care of that later.

[Teleno]

I would replace the existing one with bipolar using H-bridge.= maybe like this ?

How is this bipolar? Both MOSFETs need to be open at the same time, no inversion of current the coil.

[pito]

I would replace the existing one with bipolar using H-bridge.= maybe like this ?

[pito]

I've been looking at the White's AF108 solution, = do you have a schematic ?
This will contribute to canceling the influence of the soil mineralization, = not sure
EFE sample is then unnecessary = EFE is for erth magnetic field not for the soil mineralization,
The detector will require the addition of one more channel = 1 channel with seperate sample pulse.

[ivconic]

Without what Joop did (ported Carl's work to AVR, so also without what Carl did the first) and without the selfless great help from Davor; I wouldn't have anything to post here.

[Teleno]

If you think I made a deliberate mistake with the mosfet polarity symbol... you couldn't be further from the truth.
This is not the first time. I think Moodz already pointed it out once on one of my earlier schematics.
It's the ExpressSch software (from the ExpressPCB package) that I've been using for years to draw schematics.
I stubbornly did not want to switch to one of the newer versions, for years I used the old version, one of the first.
And I got into the habit of using some components incorrectly.
In the previous post I was joking with Moodz, of course it is a serious mistake and who is off topic; he may have a problem because of that.
But Barracuda is too well known and mentioned topic, there are many topics on the forum dedicated to that project, even the birds on the branch
already know that P-channel mosfet is used in TX.
The one who did not already know this and is not able to notice such a mistake by himself (there is a mosfet mark next to the symbol);
he is not immediately ready to work with this kind of detector. Although it seems simple, it is far from easy to make.
But I certainly accept the blame.
Later I started using a new version of the software in which I have better done component symbols.
And in the meantime, I myself made a lot of custom symbols for use in that software.
That schematic still dates from before, it was not made yesterday. The forum is full of them.
It is recommended to do the original Barracuda first and the best pcb for that is the one offered by ApBerg.
No, really I'm not that "cunning" and I don't set "traps" in my schematics.
All my mistakes are unintentional and accidental. And the reason for that is my laziness and inertia.

Planting intentional errors is a form of intellectual property protection. If someone copies your stuff with the same error then you can prove a violation of your rights. Cartographers do it all the time.