Bipolar PI design

[algan]

Hi, Carl, can you post the hex file if it is complete of course. Thanks.

[Detectorist#1]

The final solution will be seen after the real soldering of the schematic, as usual. I also have some doubts for this connections. But in this proposal is important the idea, not the exact solution - it is the basic aim of ITMDx -start to thing!

[Carl-NC]

There are ways to improve the ideal diodes, for example, preventing saturation when they are not clamping. I chose to let them saturate because this is not a very fast application. In general, the circuits throughout the book are for teaching concepts so I tried to keep them as simple as possible. They are starting points, not final destinations.

[eduardo1979]

Okay Carl. Thanks for the clarification. I thought I needed to add a 10k resistor in each rectifier between the anode of the diode and the inverting input of the operational amplifier.

[Carl-NC]

They look correct. The upper one clamps positive swings, the lower one clamps negative swings.

[eduardo1979]

Hello Carl.
After looking at the schematic a bit, I realized that there may be a design error in the two rectifiers.
I have marked them with blue circles in the schematic.
This is my humble opinion, and I hope you don't get upset.
Best regards,
Eduardo.

[Carl-NC]

Yes, I got your email. I'm traveling this weekend, will get back to you in a couple of days.

[Adam]

Hi Carl,

I hear that you sit-up challenge for LRL called the 25k USD challenge

I hope if any way to contact you please

I have something for you

[Carl-NC]

The bipolar PI design can use a mono coil, same as the other PI designs. 300uH was the common value and any jacketed (PVC, etc) stranded wire will do, I used 24 AWG.

[algan]

I am also waiting for confirmation, but can you tell me what kind of wire is suitable for making TX and RX and how many microhenries should they be? Thank you.

[ivconic]

Cool!
Take your time.
Looking forward.

[Carl-NC]

Just today I received V2.1 PCBs. I am off this weekend to play in the snow but next week I will start building it.

[ivconic]

Oh yes, my colleague is on vacation now. Today he emailed me from another place which is quite far from where he works.
I forgot to ask him how long the vacation last.
Anyway, I remember from before that this is the month of holidays and vacations in China.
I don't know if they have the same customs at JLPcb.
Things will go a little slower.
But it doesn't matter, because I'm waiting for confirmation from Carl about this detector.
I have learned patience over the years.
So no problem, this diy will be done as soon as the conditions for it are created.

[Qiaozhi]

Please be aware that Chinese New Year (Spring Festival) begins on the 29th January.
It's the year of the snake.

[ivconic]

I have not neglected and forgotten this topic.
I am waiting for the conditions to be created so that I can order the production of the pcb at JLPcb.
I have a series of various holidays and huge commitments behind me, so this is going slower than I planned.
In the meantime, I "customized" Carl's pcb design to my own preferences.
It is possible that I overdid the ground plane on the top&bottom layers!

Carl, please in case you have completed Bipolar PI; to write here the first experiences.
In case something needs to be changed or repaired; that I would not order a pcb build until I add any corrections.
Here is my "rendering" of the pcb in Sprint Layout.