I just recently started dabbling with electronics, so probably I just made some beginner's mistake. Here's my problem: I want to debounce a switch in hardware. During my internet research, I found this circuit in several variations; but pretty much all of them have in common, that they make use of 2 resistors, a capacitor and an inverting Schmitt trigger. So I built one using 2 10k resistors, a 0.1 uF capacitor and a 74LS14N (see the attached schema). My problem is, that the input of the Schmitt trigger only drops to exactly 800mV when the button is pressed, and the inverter's output stays low.
I am desperate to know where those 800mV come from.
It is also possible that something went wrong during my wiring (I built this on a breadboard with jumper cables); but there's only so many ways you can mess it up, and I tried many times already, even on different boards, with different cables and different ICs - nothing helped.