This circuit is an Educational LED Matrix Oscilloscope by using IC LM3914 and CD4017.
The max. frequency less than 10KHz !! (an educational project)
You can order this PCB from here:
https://www.pcbway.com/project/shareproject/LED_Matrix_Oscilloscope.html
Parts List:
IC LM3914 (2pcs)
IC 4017 (2pcs)
IC LM358
IC NE555
LED Matrix 8X8 display (4pcs)
Transistor 2N2222
Transistor 2N3906
Optocoupler PC817
Diode 1N4148 (10pcs)
Potentiometer 1M
Potentiometer 10K (2pcs)
Capacitor 100nF (2pcs)
Capacitor 10nF
Capacitor 220uF
Resistor 270 ohm
Resistor 390 ohm
Resistor 510 ohm
Resistor 1K
Resistor 1.2K
Resistor 1.5K
Resistor 2K (3pcs)
Resistor 3K
Resistor 3.3K
Resistor 4.7K (2pcs)
Resistor 33K
Resistor 180K
Resistor 430K
BNC Socket
IC Socket 8pin (2pcs)
IC Socket 16pin (2pcs)
IC Socket 18pin (2pcs)
Female headers 8pins (8pcs)
Potentiometer knobs (3pcs)
Power supply 5V or 4x AA Batteries
Circuit:
You can download the PDF file for this circuit with higher resolution from here:
https://drive.google.com/file/d/1wgGyi4vYCS_s4_OG-tyv9J1PUikFw7qt/view?usp=sharing
You can order the PCB from PCBWay.com here:
https://www.pcbway.com/project/shareproject/LED_Matrix_Oscilloscope.html
Video:
I explained how this circuit works in following video:
