Re: Turntable Stroboscope
Well I braved looking at it.
If the timebase is set to 5mS/div (can't quite see the switch position) then that looks like just 50c/s hum pickup from floating input or missing ground somewhere.
Might also be a much slower signal but check for pickup first?
You previous scope pics (about post #54 from memory) looked fine for digital logic so no logical reason for this to be different - apart from miss-connection somewhere.
__________________
George
|