In this case, the end product is a binary-to-seven-segment decoder built from scratch. In engineering circles, this circuit is better known as a 7447 BCD to seven-segment decoder/driver ...

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[Fran] demonstrates the display running with a CD4511B BCD-to-7-segment decoder, hooked up with a bunch of 3904 power transistors to get the chip working with filament bulbs instead of LEDs.