The IC on the circuit board is an integrated circuit module, and the small black block with pins can be seen on the circuit board is the IC.
The role of the ic on the circuit board
Analog integrated circuits, also known as linear circuits, are used to generate, amplify and process a variety of analog signals (signals whose amplitude changes with time). For example, the audio signal of a semiconductor radio, the tape signal of a tape recorder, etc.), and the input signal is proportional to the output signal.