By combining 49 of them he’s put together a soda bicarb diode steering circuit for a 7-segment display capable of showing the digits 0 to 9.

Many options exist to drive seven-segment LED displays, but most are limited to low output currents. The approach described here uses one 74ALS374 or 74AS374 octal latch, wired ...

Output devices: Motors, solenoids, bulbs, buzzers, relays, LEDs, 7-segment displays. Circuit diagrams show connections. Relays: Electrically operated switches ...

7-segment displays are used to display numerical information and consist of seven LEDs to form numbers 0-9, often controlled by a decade counter IC for accurate counting and display.