In engineering circles, this circuit is better known as a 7447 BCD to seven-segment decoder/driver, but just using a single chip has little pedagogical value.

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.

Another one is the TTL IC 74LS47 which is a BCD decoder/driver for seven segment common anode (CA) displays. Note that, the IC 74LS48 also makes the same work, but designed for seven segment common ...