MOODZ BI-MODAL PI - VLF TRANSMIT CIRCUIT

[Technologyh]

We need files all thank you

[Technologyh]

PCB

[Technologyh]

We want the plan kicad pls

[Mr.Jaick]

So I am over renovating bathrooms now ....

Progressing some development on the Bimodal PI-VLF ...

Here are some waveforms in a youtube video ..and some further bi-modal descriptions ...

https://www.youtube.com/watch?v=qhA3tgyP1YI

https://www.youtube.com/watch?v=n1WmQAyF9gA

moodz

Nice demo videos, now I know you might be a bit busy, but would you please check your DM, I've provided you with some new information.
Thank you.

[Mdtoday]

So I am over renovating bathrooms now ....

Progressing some development on the Bimodal PI-VLF ...

Here are some waveforms in a youtube video ..and some further bi-modal descriptions ...

https://www.youtube.com/watch?v=qhA3tgyP1YI

https://www.youtube.com/watch?v=n1WmQAyF9gA

moodz

Nice work Moodz!

Yeah, I know what you mean about renovations, getting trades can be painful.
I've been waiting for the plumber to return to finish of a job for nearly 3 months....

cheers

[moodz]

So I am over renovating bathrooms now ....

Progressing some development on the Bimodal PI-VLF ...

Here are some waveforms in a youtube video ..and some further bi-modal descriptions ...

https://www.youtube.com/watch?v=qhA3tgyP1YI

https://www.youtube.com/watch?v=n1WmQAyF9gA

moodz

[moodz]

Well, I always thought Moodz was a genius, now it's confirmed!

No just Mad. I started a bathroom renovation and it seems to be sucking up all my spare time.

[Sean_Goddard]

Well, I always thought Moodz was a genius, now it's confirmed!

[IBGold]

I think it is 1K

cheers

600 OHMS as far as I know.

Regards, Ian.

[Mdtoday]

ML DD coils have a built-in damping resistor for the rx side. Don't remember the value?

I think it is 1K

cheers

[Altra]

ML DD coils have a built-in damping resistor for the rx side. Don't remember the value?

[moodz]

Question: On a DD coil ( this is a minelab ) ... what impedance should be loaded across the RX .. if any ?

[moodz]

In theory it is possible what I proposed above. But after a second thought it may be a challenge. The very narrow sample window during the transition (<3us ) could be a limitation? A THS pi can have a typical half sine width of 30-200us to sample from, so lots of signal to work with. If anything, you may be able to do fe/non-fe determination? Worth exploring. Thanks for posting your projects

I have modified a MAGPI 3 board to act as a controller / RX for the BPCCPI TX and can sample down to 100 nanoseconds minimum width with 20 nanosecond timing resolution.
Have breadboarded the circuit ... The pic below shows the gate switch ( yellow ) the output of the first preamp .. gain = 10 ( blue ) and the flyback voltage ( pink ) at the coil.

The sampler is followed by a high gain diff integrator and 12 bit ADC into the micro.

Will see what happens.

moodz

[moodz]

Is the tilt polarity correct for the green trace post #22? Why less tilt for the blue trace?

With the ground present the viscous matrix absorbs energy from the H field but does not return it during flyback. Any energy losses ( or returns ) will affect the tilt.

Thats my understanding anyway.

[Altra]

I will try your method first though Altra .... noting also the other comments from G.

In theory it is possible what I proposed above. But after a second thought it may be a challenge. The very narrow sample window during the transition (<3us ) could be a limitation? A THS pi can have a typical half sine width of 30-200us to sample from, so lots of signal to work with. If anything, you may be able to do fe/non-fe determination? Worth exploring. Thanks for posting your projects