Introduction - If you have any usage issues, please Google them yourself
Square wave signal generator with a 1 HZ stability of square wave signal as CP signal input, counter full 60 seconds to points counter carry and points to counter full 60 hours carry and hours counter press "23 turn 0" rule count, the counter decoder to display Count serious error when the circuit can be used when the school, the school to points, the school to seconds. And has the time and timing of the alarm clock function.
The function of the digital clock listed below:
1) the basic function: seconds, minutes, hours timer, display and proofreading
2) hourly chime function: every hour on 59 points 50 seconds began to 500 Hz frequency voice prompt, the hour 1000 Hz uttered his voice, the voice after stop
3) set times make function: to set the alarm clock fixed-point report make, can be used to switch to shut down