Bipolar PI design

[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]

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

[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]

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

[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]

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.

[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!

[algan]

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

[Detectorist#1]

The voltages on negative inputs of IC7a and IC7b have to be zero and no chance to be amplified further.

[Carl-NC]

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

I have just posted the C source code and the hex file here.

[ivconic]

I have just posted the C source code and the hex file here.

Until You confirm that you hardware is working alright; I think we should still wait, right?

[Carl-NC]

Probably, yes.

[ivconic]

[algan]

Hi Carl, would this schematic work with DD antennas Minelab GP, SD, and GPX ? Thanks.

[Carl-NC]

Hi Carl, would this schematic work with DD antennas Minelab GP, SD, and GPX ? Thanks.

Yes.