Do It Yourself CMOS Part 2 -

DIY CMOS Part 2 - #169
Creating a CMOS NAND gate circuit from discrete components.

[@MickHealey]

Hi Bill, I love your videos and think they are ideal for people starting out. They are also great for retired old codgers like me who need a refresh. I hope you don't mind me pointing out an error at 2:52 where you say that by inverting a NOR gate you get a NAND. This is incorrect. If you invert a NOR gate, you get an OR gate.

[@LockdownElectronics]

Whoops! You are correct, and inverted NOR is indeed an OR, well spotted, and thank you!

[@Sayakas_Digital_Attic]

Thank you for this video. I've followed both this and the first part of the video, and I have to say it's very interesting

[@AndyFletcherX31]

I think you can combine the two P-channel source pins and save one resistor without changing the operation of your gate. This would reduce your component count to 5.