I am trying to build a retro digital clock using LS TTL logic, My decade counters are 74LS90 for ones of seconds, tens of minutes and tens of hours. The remaining tens of seconds, Tens of minutes, and tens of hours, use a 74LS92. I have the 60Hz reference working and use a 74LS90 (divide by 10) and a 74LS92 (divide by 6) to obtain the one pulse per second to drive the clock circuit. The display decoders are the 74LS247's and the displays are Numitrons.
What I cannot figure out is how to reset back to 1:00 after 12:00 has passed? I have tried various gates to obtain a reset pulse. After about 30 or so hours of trying I am out of ideas and require some assistance.
I am not an EE or Tech person but was a QA Engineer for 35 years. I had two strokes and now spend my spare time tinkering with electronics.
Ed