bcd

Hello! I have a problem with my circuit that I translated from Multisim to pcb, in Multisim my counter works perfectly (BCD starts at 0000), my main problem is in the PCB, my BCD counter starting at an undefined state, sometimes 1111, sometimes 0110, my switch is connected directly to a 5V...

Hello. I am having a simple problem but couldn't help to solve it, I am doing a Asynchronous BCD with JK Flip flop, but I used to create an upward ones, and I don't know how to revert it or make it downward instead of upward. I also tried to use NOT gate, but didn't work. Below is the screenshot...

So i'm having trouble on a Digital Design assignment. I'm supposed to create a circuit in logisim that checks whether a BCD number is a palindrome or not. This is easy enough when the length of the number is given but apparently I'm supposed to do this without knowing the length of the number...

I need to design a circuit to calculate the product of two 4-bit binary numbers, and then display the decimal result in three HEX displays.I already have the multiplication part, but the hex baffles me since : 1-The inputs are two 4-bit binary numbers. 2-The system can display each input...