First of all I am new to this whole circuit building thing so please don't be too harsh on me.
I recently tried to build my first adder with NAND gates. So I went to a shop and bought some CD74HCT03E devices. To get started I just tried out the NAND gate but it didn't work.
I had a really really basic setup: a NAND gate, the power supply, and a LED. I already verified this circuit with my physics teacher and he sad that everything is fine. I also checked every pin with my voltmeter. Every input (A/B grounded) were at 0V and the output (Y) flicker but were also at 0V.