Hi there,
I am working on a clock project and have a rather unusual problem with a 74LS90 decade counter. Found lots of threads on the counter but none with my particular problem. Instead of counting 0..9, my counter is producing the sequence: 0,1,2,3,12,13,4,5,14,15,6,7,8,9
I have double/triple checked all my wiring and can't find a fault. I have also tried replacing the counter chip and same problem.
My schematic is based on the HowStuffWorks digital clock http://electronics.howstuffworks.com/gadgets/clocks-watches/digital-clock6.htm
I have a 555 producing pulses, a single 74LS90 wired as in the schematic for divide-by-10 and watching the binary output via LEDs.
Thanks is advance for any suggestions.
I am working on a clock project and have a rather unusual problem with a 74LS90 decade counter. Found lots of threads on the counter but none with my particular problem. Instead of counting 0..9, my counter is producing the sequence: 0,1,2,3,12,13,4,5,14,15,6,7,8,9
I have double/triple checked all my wiring and can't find a fault. I have also tried replacing the counter chip and same problem.
My schematic is based on the HowStuffWorks digital clock http://electronics.howstuffworks.com/gadgets/clocks-watches/digital-clock6.htm
I have a 555 producing pulses, a single 74LS90 wired as in the schematic for divide-by-10 and watching the binary output via LEDs.
Thanks is advance for any suggestions.