This circuit is a Non Contact Tachometer Without using arduino or any other Microcontroller.
Parts list:
IC 555 (2pcs)
IC 40110 (4pcs)
IC 4060 (2pcs)
IC 4017 (2pcs)
IC 4093
Avoidance sensor TCRT5000
Dip switch 4 channel
Transistor 2N2222 (2pcs)
Optocoupler PC817 (2pcs)
Crystal 32.768 KHz
7segment display common cathode (4pcs)
LED
Diode 1N4148
Bush button switch
Capacitor 100nF (5pcs)
Capacitor 100uF
Capacitor 1uF
Capacitor 40pF
Resistor 1K (34pcs)
Resistor 2M (2pcs)
Resistor 10K
Resistor 33K
Resistor 20K
Resistor 10M
Resistor 200R
Resistor 220K
Circuit:
You can download the PDF file for this circuit with higher resolution from here:
https://drive.google.com/file/d/1rGwcdzdpy0AYlgN0ucQt84AyIouAQG1G/view?usp=sharing
You can order the PCB for this circuit from PCBWay.com here:
https://www.pcbway.com/project/shareproject/Non_Contact_Tachometer_Without_Microcontroller.html
Video:
I explained the circuit in following video:
