Designed a counter using LS circuits.
All was going well up to the last decade.
The circuits track the frequency as designed to 5KHz.
After that the last stage output sends a pulse to the fifth once every four gate times.
Lower the frequency, the pulse stops.
I swapped out the fourth and fifth devices with different ones, moved the fifth device to a different place on the protoboard.
I would like to know what this glitch is.
All was going well up to the last decade.
The circuits track the frequency as designed to 5KHz.
After that the last stage output sends a pulse to the fifth once every four gate times.
Lower the frequency, the pulse stops.
I swapped out the fourth and fifth devices with different ones, moved the fifth device to a different place on the protoboard.
I would like to know what this glitch is.