Educational LED Matrix Oscilloscope by using IC LM391 and CD4017
You can order the PCB from PCBWay.com: https://www.pcbway.com/project/shareproject/LED_Matrix_Oscilloscope.html
Circuit and parts list: https://mousa-simple-projects.blogspot.com/2020/09/educational-led-matrix-oscilloscope.html

#Oscilloscope
#LED_Matrix