hi, I'm a fairly new hobbyist, and i've been trying to teach myself some things about TTY circuits. I had a set of TTY chips laying around and decided that I'd see if I could make them 'do' something. So my first project has been to try and make a 7-segment display count up from 0 to 9 using some kind of button press.
The counter chip I had on hand was a 74193, and I've spend a lot of time reading up on it and trying to make it work, but for the life of me I can't get the thing to count. I've tried many different set-ups but haven't had any luck. I'm wondering if I'm not sending it a pulse that it can recognize as a clock cycle, or if there's just something weird with the chip. Right now I have a 7400 chip debouncing a switch and and output from that going into the count-up terminal of the 74193. The count-down terminal is held high. When I flip the switch I know I'm getting a slow pulse (maybe that's the problem, and if so, is there a circuit I can build to make a quick single pulse?) but nothing is happening at any of the output terminals. They all just stay at low, even though I'm giving the counter input a pulse.
I hope I've described my situation well enough, I just can not figure out why the counter isn't counting. My best guess is that the pulse is too slow, but even when I apply a 200 Hz square wave nothing happens. Any help would be great. I have read the data-sheets and read quite a bit on this forum as well, but nothing I try seems to work. Thanks.
The counter chip I had on hand was a 74193, and I've spend a lot of time reading up on it and trying to make it work, but for the life of me I can't get the thing to count. I've tried many different set-ups but haven't had any luck. I'm wondering if I'm not sending it a pulse that it can recognize as a clock cycle, or if there's just something weird with the chip. Right now I have a 7400 chip debouncing a switch and and output from that going into the count-up terminal of the 74193. The count-down terminal is held high. When I flip the switch I know I'm getting a slow pulse (maybe that's the problem, and if so, is there a circuit I can build to make a quick single pulse?) but nothing is happening at any of the output terminals. They all just stay at low, even though I'm giving the counter input a pulse.
I hope I've described my situation well enough, I just can not figure out why the counter isn't counting. My best guess is that the pulse is too slow, but even when I apply a 200 Hz square wave nothing happens. Any help would be great. I have read the data-sheets and read quite a bit on this forum as well, but nothing I try seems to work. Thanks.