i'm making a 12H digital clock and when it resest at 12 it does not go to 1 instead it goes to 0, How would i get 1 intead of 0?
Can i use 74ls192 with registers preloading?
Can i use 74ls192 with registers preloading?
Way back in the 70s, Henry's radio used to include a circuits collection in the back of their catalogue - one project was an entirely TTL digital clock.i'm making a 12H digital clock and when it resest at 12 it does not go to 1 instead it goes to 0, How would i get 1 intead of 0?
Can i use 74ls192 with registers preloading?
Hi,i cannot understand
My counter started life as an industrial digital tachometer - the firm I worked for had just acquired a competitor, they piled all the stuff they considered junk in a loading bay with a notice: "Help yourself". There was a fair bit missing from mine after I'd done a few up and sold them, the timebase was straight from one of the D. Lancaster cookbooks. The original had 7-segment neon displays - which I ran out of that weren't punctured. I didn't have enough 7-segment LED digits all the same size to complete mine, so 2 tall ones for the most significant digits and a couple of tiny calculator size digits at the other end.Hi,
Yes some of those older circuit methods cost money because there are so many chips involved. I once built an 8 digit frequency counter, with individual 4 bit counters and individual 4 bit latches and individual gates for multiplexing the 8 digit LED display. Counting the chips, that's 24 IC chips not including a few more for the glue logic and clock generator.
The ones I used were about 0.2" high, but they were individual digits. Having laid out the Veroboard for (mostly) 0.5" digits, I had to solder on like a home made lead-frame to mount the tiny ones.Hello again,
That sounds interesting too.
For mine, believe it or not, i used the output from standard TTL gates (not LSTTL but the standard family TTL gates) to drive the LED display. The digits were small so they lit up good enough to see with a small, decorative hood mounted on the front panel. These LEDs were only 0.2 inches high and came in a row of 3 or 4 LEDs in one dip package. I still see them for sale now and then on the web. Red LEDs of course, as back then (sometime in the 1970's) they didnt make anything other than red.
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