Bipolar PI design

[pito]

Hi Pito
Without the chip, nothing is visible.

I was testing this part

[pechkata]

[pechkata]

I made Tx tests, amplitude 1/2 compared to 1 MOSFET circuit, frequency 2x higher.
So sensitivity will drop.

Hi Pito
Without the chip, nothing is visible.

[pito]

I only assembled Tx part of the circuit on breadboard

[Badim49]

I made Tx tests, amplitude 1/2 compared to 1 MOSFET circuit, frequency 2x higher.
So sensitivity will drop.

Can you tell me how to assemble a working device and what the latest changes are?

[pito]

I made Tx tests, amplitude 1/2 compared to 1 MOSFET circuit, frequency 2x higher.
So sensitivity will drop.

[pechkata]

Hi Carl, many of us, ITMD3 readers, are very grateful for your efforts in favor of DIY detectorists to be involved in this exciting hobby!

Why don't you continue this project until the end?
But you're starting other projects.
You are using the fox theory of sour grapes.
And these photos are not from this project - but it could be continued.

[Badim49]

And this schematic above is just a "picture" too, for all those who are interested, here is the schematic file.
The software that is needed is "ExpressPCB",
(don't get confused, it's a free installation package that during installation also installs a schematic part called "ExpressSCH" in which I mostly draw schematics)
and you can download it free from here: https://www.expresspcb.com/
And here is the sch file:

There is a firmware ?

[h9361]

These are the SAT circuits. Exact same thing as in Hammerhead.

Thank you dear Carl for your information.

[Carl-NC]

These are the SAT circuits. Exact same thing as in Hammerhead.

[h9361]

Capacitors are used to filter noise. I don't see resistors R74 and R75 in the schematic.

See attached (red circle).

[eduardo1979]

Capacitors are used to filter noise. I don't see resistors R74 and R75 in the schematic.

[h9361]

There are many versions of the schematics posted on the forum. Please attach the schematic you're referring to so we can identify the specific components you mean.

Your schematic, attached.
Can you tell me why you use R74,C43 and R75,C44?
Is it for reaching a soft audio?

[eduardo1979]

There are many versions of the schematics posted on the forum. Please attach the schematic you're referring to so we can identify the specific components you mean.

[h9361]

Hello.
Yes, GND and -5V.

Thank you.
I have another question, please forgive me.
Can you tell me why you use R74,C43 and R75,C44?
Is it for reaching a soft audio?