To make a pre-amplifier circuit, please ask how to make this circuit into a single power supply. There is room for improvement on this road, so please mention it, thank you.
Dannie postado em July 22, 2020
If you change to a single power supply, the landlord must choose 24v and choose a reference 0V point
Flint postado em July 22, 2020
It's very simple, just use two resistors of the same resistance (10k~100k) to divide the voltage of VCC (12V in the question), and then connect to the positive phase terminals of the two op amps.
Hanson postado em July 22, 2020
It is solved by adding a fixed bias to the positive input terminal. Generally, the fixed bias is set to 50% of the maximum output voltage of the op amp
