RedditPP Mascot

RedditPP

r/synthdiy • … • u/rnobgyn

Logic Gate trigger question

Hi! I’m designing a sequencer but I’m a bit dumbfounded why something so simple isn’t working as expected. I’m experimenting with 555 timers as triggers for the gate and the end result seems to be… opposite?

Simple AND gate (2N2222), 555’s have a 4.8v output (after diode + resistor). I also noticed that the 555’s will sync together when at their highest speed (they share power rails) so there’s quite a few ghosts running around.

Let me know if more info is needed as I’m getting similar weird results with all the logic gates I’m trying out. Makes me think it’s something to do with the 555 outputs.

— 0