I've designed a countdown timer using JK flip-flops with preset and clear. The schematic is posted below. Including the diagram of the clock.
The outputs of the countdown timer, the ones connected to the 7segment LED display, are supposed to be connected to a 74185 Binary-BCD converter IC and would be passed through a CD4511 before the 7segment LED.
The switches for the 12mins, 10mins, and 4mins, are supposed to be pulse switches.
Will someone help me with my clock?
Coz I can't make it to a exactly or near 12mins or any of the settings. I have a difference of about 0.2-1.3seconds delay/advance.
Any comments or suggestions regarding my design is highly appreciated. Thanks.