Bipolar PI design

[Detectorist#1]

Hi eduardo1979,
The question of pechkata in post #388 is concerned only for right connection of 74HCT4316 in the schematic of the Bipolar-PI design in ITMD3. My answer is concerned only with this. The other problems in this design are not discussed in my answer.

[eduardo1979]

Hello Detectorist #1. Sorry for the misunderstanding.

[algan]

Hi Eduardo, you can do this test on the bipolar circuit with the MAX4066ACPD integrated circuit and not use translators, but you have to change the power supply of the bipolar circuit to be like the ITM3 GB-PI, but then GND will be +12 like in TDI and you know that you have to adjust the circuit, the power supply of the PIC16F18426 chip, the source of the IRF740 transistors to be -12 volts and I'm thinking about the sound, which is GND, and where else you need to, but you understand that you also need this new bipolar board.

[pechkata]

Hello
Has anyone besides Karl-NC worked on this scheme?
I like how it works.
And how did you know it wasn't working?

[eduardo1979]

Hi Eduardo, you can do this test on the bipolar circuit with the MAX4066ACPD integrated circuit and not use translators, but you have to change the power supply of the bipolar circuit to be like the ITM3 GB-PI, but then GND will be +12 like in TDI and you know that you have to adjust the circuit, the power supply of the PIC16F18426 chip, the source of the IRF740 transistors to be -12 volts and I'm thinking about the sound, which is GND, and where else you need to, but you understand that you also need this new bipolar board.

Hi Algan.
Using voltage level translators hasn't been a big problem for me. The voltage level translators solved the problem with the 4316 IC, and I was able to use the CD4066 instead without any problems. My full-bridge bipolar PI detector works perfectly. On the other hand, I'd like to make a half-bridge bipolar PI detector because I could use any commercially available PI coil. It would also be a better detector for searching for small gold nuggets. I'm still figuring out where to start.

[Detectorist#1]

Hi eduardo1979,
Let to assembly my schematic in "Bipolar PI MD with GB and DD coil" and to make serious tests in real different ground conditions. All other comments are only words.

[Detectorist#1]

Also, the using of smaller size of DD coils have to be useful for searching of smaller nuggets as you well know.

[algan]

I don't know if increasing the frequency would help for smaller goals, like starting at 4 kilohertz and then going up to 8 kilohertz, but let Carl say if that's possible and what effect it would have.

[Carl-NC]

Generally, a higher pulse frequency helps as it integrates more samples. Eric's Gold Quest ran at 10kHz. Just watch the power consumption, reduce the pulse width as needed.

[eduardo1979]

Hi eduardo1979,
Let to assembly my schematic in "Bipolar PI MD with GB and DD coil" and to make serious tests in real different ground conditions. All other comments are only words.

Hello Detectorist #1. You're right. We'll work on your design and conduct the necessary tests in real-world conditions.