The pins of the IR2104S are defined as follows
This chip outputs drive signals for the upper and lower arms,
The right drive circuit is a typical H-type drive circuit, the upper and lower two can achieve the positive and negative control of the motor, the four parallel field effect tube drain and source diodes are continuous flow, protecting the field effect tube from being broken down by high voltage back electromotive force, C9 and C11 are self-lifting voltage capacitors, the right two groups of resistors and light-emitting diodes are indicating the direction of current.