7 Segment LED Counter

This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily

Parts
Resistors          7(470 ohm)
LEDs                7
IC                      U1 (74LS90 TTL BCD Counter IC)
IC                      U2 (74LS47 TTL Seven Segment Display Driver IC)