How to detect only first rising edge in a train of pulses? Input will vary over a wide frequency range, but the lowest possible frequency is known.
I think it might require a latch. Wondering what's the dead-simplest way to do this. Possible with rudimentary CMOS logic?
Input:
Output:
I think it might require a latch. Wondering what's the dead-simplest way to do this. Possible with rudimentary CMOS logic?
- The source has no signal at first. Output should be low.
- Suddenly, a train of square wave begins. The first pulse should drive the output to high.
- Subsequent falling edges won't drive the output low.
- When the train of pulses stops, output should return to low.
Input:
Output:
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