I am trying to get more familiar with using a 74HC14, as an experiment I have an ldr set up in a voltage divider configuration and the center tap goes to the input of the 74HC14 input 1. I have all of the other inputs tied to ground. Everything is soldered together on a perf board. I have a .1uF, .01uF, .001uF, .0001uF cap on the power pin (probably overkill). Input voltage is 5v. The voltage divider and the IC are both powered off the same rail
The IC triggers as expected when light is shined on/removed from LDR. Below is the waveform I am getting for the falling edge, it is very consistent from test to test.
What I don't understand is why the signal is dropping to -2.4 or so when triggered then staying below 0.
The rising edge has an overshoot to about 6v but is smoother. Any information/guidance would be appreciated.