I designed and built a 0-15 up counter that is displayed in binary and on a 7 segment display.

Parts Used: 2 EA JK Flip Flops (7473), 1 EA 555 Timer (555), 1 EA Seven Segment Display, 1 EA Seven Segment Decoder (7447), 2 EA Capacitors, 13 EA 330 ohm Resistors, 2 EA 100K ohm Resistors, 4 EA LEDs.