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HI, i would like to ask if there is a logic switch that will trigger and will output with the following conditions..
BEFORE TRIGGERING:
The input is negative
The output is negative (0)
SWITCHING MODE:
If i trigger the switch (or when a current pass through a NPN transistor), the positive 5 volts (timed input for 19secs) will enter and goes to the output for "1 second only" and goes back again to 0 and it will remain negative for the whole 4sec or 19 secs.
Just like entering the 5 volts for 1 sec in the output, and the output will return to negative again..
Input for 4 or 19 secs | Output for 1 sec | Output after 1 sec
0 | 0 | 0
1 | 1 | 0
I was building a traffic light circuit with the red and green lights will light up for 19 secs and the countdown 7 segment will trigger from 19secs to 0secs.. (19 secs because the yellow light was already included in the countdown)i am using 4017 IC, the Traffic light's 555 will produce 2 secs per cycle and each output of 4017 will last for 4 secs.. and the 7 segment's 555 will produce 1 sec per cycle.
Pls refer to this pic....
Due to 555 imperfect clock .. sometimes the 7-segment will not be synchronize to the 4017 or from that 19sec gap.. so i would like to trigger the RESET button of all the 74192's and 4511's when the clock positive volt reaches Q6 to Q9 at 4017's pin.
BEFORE TRIGGERING:
The input is negative
The output is negative (0)
SWITCHING MODE:
If i trigger the switch (or when a current pass through a NPN transistor), the positive 5 volts (timed input for 19secs) will enter and goes to the output for "1 second only" and goes back again to 0 and it will remain negative for the whole 4sec or 19 secs.
Just like entering the 5 volts for 1 sec in the output, and the output will return to negative again..
Input for 4 or 19 secs | Output for 1 sec | Output after 1 sec
0 | 0 | 0
1 | 1 | 0
I was building a traffic light circuit with the red and green lights will light up for 19 secs and the countdown 7 segment will trigger from 19secs to 0secs.. (19 secs because the yellow light was already included in the countdown)i am using 4017 IC, the Traffic light's 555 will produce 2 secs per cycle and each output of 4017 will last for 4 secs.. and the 7 segment's 555 will produce 1 sec per cycle.
Pls refer to this pic....
Due to 555 imperfect clock .. sometimes the 7-segment will not be synchronize to the 4017 or from that 19sec gap.. so i would like to trigger the RESET button of all the 74192's and 4511's when the clock positive volt reaches Q6 to Q9 at 4017's pin.
