My project incorporates two 555 timers, one monostable, one astable. Two LS74193's - decade counters. A 7404 inverter for the 8 to 1 multiplexer, a 74151. I am building on a PAD-234a trainer.
My objective is to display with LED's the hexadecimal table in binary format 0-15 from the second decade counter, after dividing by three through the first counter, from pulses generated by the oscillation of the second timer. The one shot runs for 48 seconds, the oscillator is 1 hz which provides the input for the first decade counter.
I am having a difficult time with the multiplexing. There is a table given by the instructor which the multiplexer's output should match with each digit.
ABCD Y
0000 1
0001 1
0010 0
0011 1
0100 1
0101 0
0110 1
0111 0
1000 1
1001 1
1010 1
1011 1
1100 0
1101 0
1110 1
1111 1
I am failing to understand the wiring of the 151 chip D 0-7. I have studied the datasheet quite a bit but have yet to be able to interpret the formula into a wiring scheme.
Thank you for taking a look.
My objective is to display with LED's the hexadecimal table in binary format 0-15 from the second decade counter, after dividing by three through the first counter, from pulses generated by the oscillation of the second timer. The one shot runs for 48 seconds, the oscillator is 1 hz which provides the input for the first decade counter.
I am having a difficult time with the multiplexing. There is a table given by the instructor which the multiplexer's output should match with each digit.
ABCD Y
0000 1
0001 1
0010 0
0011 1
0100 1
0101 0
0110 1
0111 0
1000 1
1001 1
1010 1
1011 1
1100 0
1101 0
1110 1
1111 1
I am failing to understand the wiring of the 151 chip D 0-7. I have studied the datasheet quite a bit but have yet to be able to interpret the formula into a wiring scheme.
Thank you for taking a look.