I'm working on a project for school, a 555 based one minute timer, and I'm stuck trying to figure out how to activate the second digit. It keeps counting 0-9 and starting over, while the tens digit just sits there. I'm using a 555 to drive a pair of 7490 chips that feed 7447 chips, output to two 7 segment LEDs. The Qd of the first 7490 feeds the CLK-A on the second 7490. Any help will be greatly appreciated.
I did find some other threads regarding similar projects, but none that helped.
innernerd
I did find some other threads regarding similar projects, but none that helped.
innernerd