This circuit is an LED matrix to draw Lissajous pattern/curve .
Max frequency less than 10KHz (an educational project).
Input Voltage 1Vpp with 0.7V DC offset.
You can order this PCB from PCBWay.com :
https://www.pcbway.com/project/shareproject/LED_Matrix_and_Lissajous_pattern_e222919c.html
Parts list:
LM3914 (2pcs)
LED (81pcs)
Transistor S9015 (9pcs)
Resistor 1.5K or 2K (4pcs)
BNC male connector (2pcs)
IC Socket 18pin (2pcs)
Circuit:
You can download the circuit with better resolution as PDF file from here:
https://drive.google.com/file/d/13DUrvN1JwO0kIJrHimmm5nJsOMEByh_k/view?usp=sharing
*Resistors could be 1.5K or 2K
Video:
