Help detector level design

[jeep6789]

Hello everyone! I want to make a wireless detector with Bluetooth and single-chip mechanism, because the op amp is required to be ? 5V level, single-chip microcomputer and Bluetooth 3.3V, then in this circuit, how should I generate ? 5V and 3.3V?

[Carl-NC]

Why not run the opamp on 3.3V?

[jeep6789]

Why not run the opamp on 3.3V?

Please give me a good suggestion and program, mainly the power supply of the op amp output is much higher than the single-chip power supply, how can the single-chip function detects the voltage of the op amp output

[jeep6789]

If the 3.3V is connected to the GND, the microcontroller cannot detect the negative pressure of the op amp, if connected to -5V, then the op amp output is 10 volts, far exceeds the maximum pressure of the microcontroller.

[AK48]

https://randomnerdtutorials.com/how-...ft-5v-to-3-3v/


https://eu.mouser.com/c/power/dc-dc-...el%201=3.3%20V

[Carl-NC]

Please give me a good suggestion and program, mainly the power supply of the op amp output is much higher than the single-chip power supply, how can the single-chip function detects the voltage of the op amp output

You would need to create a rail splitter to create an "analog ground" of 1.65V. Then you will also need to AC-couple the flyback to the preamp. The Pulse-4 project in ITMD shows how all this is done.