Here is the start of the 7 Segment BCD decoder logic. The idea is to make a generic board that can decode BCD data and display like a LED Digit might. This is similar to the 7447 (or many variants). This post will show the general Relay based logic that I will be using.
AND, OR, NAND, NOR gets as depicted in relay logic. The Inverter is simple enough for you to figure it out! Click on any of the thumbnail pictures to see it in a larger size.
More coming soon. The schematic for the decoder is completed, just need to make it presentable.