Hi,
Doing a project at the mo, but just need help on the final section...
I have made a simple circuit consisting of a BCD coded switch, inverting buffers (4049) decoder driver (4511) and 7 seg displayso the number on the switch is displayed.
I then added another switch, another inverter chip, and a 4 bit binary full adder (4008) so the sum of the numbers on the switches is displayed.
This far the circuit is working fine, but it fails for numbers whose sum is greater than 9. I have been given another adder,another display, and a 4058 chip (a dual 2-wide 2-input AND-OR-invert gate).
I know that a BCD carry should be generated and 6 added to the binary sum when the binary sum lies between 1010 and 1111, but can't collect all this to figure out the final circuit diagram, it's the carry in/out business that's confusing me.....
If anyone could reply with the final circuit diagram hints or suggestions it would be much appreciated.
Thanks
Matt