How to display 0 to 15 in to 2 x 7segment?

Thread Starter

markosma16

Joined Jul 12, 2015
7
I've been trying to work on this but I can't make it. I'm using 74LS93 to display 0 to 15 into 2x 7segment. So far I worked on displaying 10 but after that it'll reset. I ANDed Qb and Qc (4 & 2) and put it in the RESET but instead the ones digit will count up to 15 (not decimal) and reset again.
 

Thread Starter

markosma16

Joined Jul 12, 2015
7
So the display of the first digit will be like this : 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 then back to 0 again
the 2nd digit will only become 1 when the 1st digit becomes 0. So far 0 to 10 then back to 00 is all I worked.
Sorry for bad english
 

hp1729

Joined Nov 23, 2015
2,304
Design 888 15 in two displays.PNG
I've been trying to work on this but I can't make it. I'm using 74LS93 to display 0 to 15 into 2x 7segment. So far I worked on displaying 10 but after that it'll reset. I ANDed Qb and Qc (4 & 2) and put it in the RESET but instead the ones digit will count up to 15 (not decimal) and reset again.
If you are really desperate to do this you can use a PROM. The 7493 selects the address of the PROM. The contents of the PROM gives the desired digits. 74S188 or 74S288, or other 32 x 8 PROM.
 

hp1729

Joined Nov 23, 2015
2,304
Is there any other trick that can I use like putting some logic gates or adding one 7493?
Another counter would do it. Reset the one's counter at a count of ten and carry that to the ten's counter. Then reset both counters at a count of 1, 5.
But then you have two counters. Why not just use two decade counters.
 

MrChips

Joined Oct 2, 2009
30,821
Another counter would do it. Reset the one's counter at a count of ten and carry that to the ten's counter. Then reset both counters at a count of 1, 5.
But then you have two counters. Why not just use two decade counters.
That is assuming that you are counting a clock signal.
What if there is no clock and the 4-bit binary value is static?
 

hp1729

Joined Nov 23, 2015
2,304
Design 890 15 counter.PNG
Another counter would do it. Reset the one's counter at a count of ten and carry that to the ten's counter. Then reset both counters at a count of 1, 5.
But then you have two counters. Why not just use two decade counters.
The ones counter counts up to 9. On the tenth pulse it resets itself to zero and sets the tens counter. On the following sixth count both counters reset.
 
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