Bipolar PI design

[pechkata]

Hello Carl-NC
How can we program a time slot?
How can we build this type - time slot?
I tried but I can't do it.

[Detectorist#1]

Hi pechkata,
Any news for very interesting investigations - why 3 pieces of this project work differently?

[ivconic]

I can't tell from the voltmeter, too hard to see. An oscope trace will tell you quickly.

I'll do that next time I sit to deal with it.

[ivconic]

I glued 3 pieces of circuit board.
All three work differently.
One of them works like yours.

https://www.youtube.com/shorts/Z1NFVttxZ0E

That's interesting to investigate!

[Carl-NC]

You didn't tell me your opinion about the voltage?
Is that how it should act?

I can't tell from the voltmeter, too hard to see. An oscope trace will tell you quickly.

[pechkata]

It makes sense.
In the previous videos you saw the behavior on coins.
It always behaves the same.
You didn't tell me your opinion about the voltage?
Is that how it should act?
I still have doubts about the quality and originality of these TL072s.

I glued 3 pieces of circuit board.
All three work differently.
One of them works like yours.

https://www.youtube.com/shorts/Z1NFVttxZ0E

[pechkata]

Greetings to all...

[ivconic]

If you are expecting a roll of solder to be a low conductor, it's not; it's a high conductor, just like the nail. Get some household aluminium foil and cut a 25cm square piece, use that for a low conductor.

It makes sense.
In the previous videos you saw the behavior on coins.
It always behaves the same.
You didn't tell me your opinion about the voltage?
Is that how it should act?
I still have doubts about the quality and originality of these TL072s.

[Detectorist#1]

Bravo pechkata! Very good result with home-made bifilar TX OO coil! I also work on bipolar MD with GB now.

[Carl-NC]

If you are expecting a roll of solder to be a low conductor, it's not; it's a high conductor, just like the nail. Get some household aluminium foil and cut a 25cm square piece, use that for a low conductor.

[ivconic]

First, check that both demods are working correctly: IC5a should have a positive-negative target signal and IC5b should have a negative-positive target signal. If these look OK, then check the soldering of you GB pot, especially the pin to the ground channel.

Carl , I am lost, here is the video, go figure:

[eduardo1979]

Very good videos!!!

[pechkata]

Continuation:

https://www.youtube.com/watch?v=PADUImGg4Ic

[pechkata]

I knew something good would eventually come out of this!

https://www.youtube.com/watch?v=pMRQRCv3WwE

[ivconic]

I knew something good would eventually come out of this!