The seven segments digital tube with 4-bit to 7-bit decoder. I used a couple of LEDs for each segment to make sure everyone see the effect. Range: 0~9 A b C d E F. Right switchs can help you to choose vdc or vpulse for input. If you choose vdc, then the left switch can help you change input value e.g. 0000,1100,0110...
Last, enjoy it even though it's a little complex!
