Up-Down Counter
This type of circuit is a counter that changes its state in either direction depending on the control input. It counts from 0-9 if counting up and 9-0 if counting down.
Assembly Instruction:
We will use the available ICs to create the counter. We will use 74LS192 as the up-down counter and connect it with a 4-to-16 demultiplexer to create running lights. The given schematic diagram would be:
The output of the 74LS192 would be connected to a 74LS47 IC which is a BCD to DEC converter for us to display the numbers on a 7 segment display. The clock would be an LM555 IC in astable mode to produce a pulse that would make the numbers either to increment or decrement.
Pictorials:
