Super Motor-Music Stepper Motor

The shortcomings (advantages) of relatively large vibration of the A4988 drive motor are used in combination with the audio amplification circuit to realize the motor playing songs.
Notes:
1. The A4988 pin header is inserted into the board. You need to replace the 8Pin pin header in the BOM with an 8Pin header (pitch 2.54mm). You can also directly weld it on the board (not recommended).
2. Music must be used. Square wave music should not have noise, otherwise the motor will not work properly. Square wave music can be generated using FL studio's 3X OSC3.
Please find a 12V power supply with better quality, otherwise there will be noise when there is no audio input4
. The design uses a 42 stepper motor and a socket designed according to the pins of the 42 stepper motor (the stepper motor line sequence is red, green, yellow and blue. The standard motor has not been tested. Please modify it according to the manual)
5. The professional version project is not presented Schematic diagram and PCB, please open the editor in the upper right corner
6. The 0Ω resistor is used to control the rotation direction of the motor, please increase it as needed