This electronic circuit is a voltage multiplexer for oscilloscope that helps you to measure 8 different DC voltages at the same time by using only one channel of your oscilloscope !
Max. input voltage for series sources = less than 10V
Max. input voltage for separated sources = less than 20V
You can order this PCB from here:
https://www.pcbway.com/project/shareproject/8_Channel_Voltage_Multiplexer_for_Oscilloscope.html
Parts list:
IC 4017
IC 4093
Optocoupler PC817 (16pcs)
Resistor 1K
Resistor 20K
Resistor 1M (3pcs)
Capacitor 100nF (9pcs)
Capacitor 2.2nF
Capacitor 220uF
BNC male Jack (2pcs)
Coin cell Battery CR2025 or CR2030 (2pcs)
Coin cell Battery holder for CR2025 or CR2030 (2pcs)
IC Socket 16 pin and 14 pin
ON/OFF Dip switch
Circuit diagram:
You can download this circuit as PDF file from here:
https://drive.google.com/file/d/1eckTGNceKRh6WVwUSKPgoIZaHeqKw8Fq/view?usp=sharing
Video:
In following video you can see how this circuit works
