CD4077 | XNOR Gate

In this video, I've explained the basic things of CD4077. It is a XNOR Gate IC.
CD4020 video:
https://youtu.be/QmvfDinq0QI

CD4040 video:
https://youtu.be/aR_Bv3RhuD8

CD4060 video:
https://youtu.be/4mxwQ-zIwS8

Why do we need pull down resistor?
https://youtu.be/7J_4eA5RUzk
Required Components:

IC : CD4077
Resistors : 10 KΩ, 220 Ω
Miscellaneous : Breadboard, Switch
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Видео CD4077 | XNOR Gate канала EE Wave